Do you need to know, when is the best time to go to Washington (state)? Then you should take a look here, what weather you can expect there during the year.
Washington (state) is part of USA - United States of America. The climate of USA is very varied, as United States of America is a large country. The climate is mostly temperate, but tropical in Hawaii and Florida, and arctic in Alaska. This is not all. The climate is semiarid in the great plains west of the Mississippi River, and arid in the Great Basin of the southwest. You can expect low winter temperatures in the northwest, but they are sometimes moderated in January and February by warm winds. Winters in the south are warmer. Don? forget, that temperatures are usually significantly lower in mountains.
When speaking about the usual weather in this area, the information is relevant for example for these popular places: Aberdeen, Allyn, Anacortes, Anderson Island, Arlington, Ashford, Asotin, Auburn, Bainbridge Island, Belfair, Bellevue, Bellingham, Blaine, Blake Island, Blakely Island, Bothell, Bow, Bremerton, Brewster, Bridgeport, Brownsville, Burien, Burley, Burlington, Camano Island, Camas, Cashmere, Cathlamet, Centralia, Chehalis, Chelan, Cheney, Chico, Clarkston, Cle Elum, Clinton, Colfax, College Place, Columbia River Plateau, Colville, Coulee City, Coupeville, Davenport, Dayton, Decatur Island, Dewatto, East Wenatchee, Eastsound, Ebey's Landing National Historical Reserve, Edison, Edmonds, Ellensburg, Elma, Ephrata, Everett, Farmington, Federal Way, Ferndale, Fidalgo Island, Fife, Forks, Fox Island, Freeland, Frenchman Coulee, Friday Harbor, Gig Harbor, Goldendale, Gorst, Grand Coulee, Granger, Greenbank, Hansville, Harstine Island, Holly, Home, Hoodsport, Hoquiam, Ilwaco, Indianola, Issaquah, Kelso, Kennewick, Kent, Ketron Island, Key Center, Keyport, King County, Kingston, Kirkland, Kitsap Peninsula, La Conner, Lacey, Lakebay, Langley, Leavenworth, Liberty Lake, Long Beach, Longbranch, Longview, Lopez Island, Lummi Island, Lynden, Lynnwood, Manchester, Marysville, Mercer Island, Moclips, Monroe, Montesano, Moses Lake, Mossyrock, Mount Baker, Mount Rainier National Park, Mount St. Helens, Mount Vernon, Mountlake Terrace, Mukilteo, Naselle, Neah Bay, Newport, North Bend, North Cascades, North Cascades National Park, North Central Cascades, North Sound, Northeast Washington, Northwest Cascades, Oak Harbor, Ocean City, Ocean Park, Ocean Shores, Okanogan, Olalla, Olympia, Olympic National Park, Olympic Peninsula, Omak, Orcas, Orcas Village, Oroville, Othello, Oysterville, Pacific Beach, Palouse, Pasco, Pateros, Point Roberts, Pomeroy, Port Angeles, Port Gamble, Port Orchard, Port Townsend, Potlatch, Poulsbo, Prosser, Puget Sound, Pullman, Purdy, Puyallup, Raymond, Redmond, Renton, Republic, Retsil, Richland, Ridgefield, Ritzville, Roche Harbor, San Juan Island, San Juan Islands, SeaTac, Seabeck, Seattle, Seaview, Sedro Woolley, Selah, Sequim, Shaw Island, Shelton, Shoreline, Silverdale, Snohomish, Snoqualmie Pass, Soap Lake, South Bend, South Sound, Southwest Washington, Southworth, Spokane, Steilacoom, Stevens Pass, Stevenson, Stuart Island, Sumas, Sun Lakes Dry Falls State Park, Sunnyside, Suquamish, Tacoma, Tahuya, Tonasket, Toppenish, Toutle, Tracyton, Tukwila, Tumwater, Twisp, Union, Union Gap, Vancouver, Vashon Island, Vaughn, Waldron Island, Walla Walla, Wapato, Washougal, Waterville, Wenatchee, West Richland, Westport, Whidbey Island, White Center, Winthrop, Woodinville, Woodland, Yakima, Zillah.
Let's look now what weather you can expect in the area around Seattle and in many other cities. The warmest month here is August, the average maximum temperature is 24.9 ℃ (76.82 ℉). The average minimum temperature in this month is 13.6 ℃ (56.48 ℉). The coldest month here is December, the average maximum temperature is 7.7 ℃ (45.86 ℉). The average minimum temperature in this month is 2.3 ℃ (36.14 ℉). The most rainy month here is November, the average number of rainy days is 18.1. The least rainy month here is August, the average number of rainy days is 4.7. 
When travelling around Washington (state), always consider the altitude of the the place as well. We should remind you, that the highest point in USA - United States of America is Denali (Mount McKinley) (6190 m) and the lowest point is Death Valley (-86 m). So there are huge differences in altitudes in this country and the weather is very different in them therefore. Keep in mind, that the temperature usually decreases by 1.2 - 1.9 ℃ (2.2 - 3.5 ℉) per 200 m (656 ft), depending on the other conditions. (And we should add, that in the very special condition named thermal inversion even the temperature may be higher in higher altitudes.)
Typical (usual) weather in Washington (state) in January is this: The average highest temperature in Washington (state) in January is 8.5 ℃ (47.3 ℉). The average lowest temperature is 2.9 ℃ (37.22 ℉). At the beginning of January you can expect lower temperatures, the average highest temperature is around 8.1 ℃ (46.58 ℉). At the end of January you can expect higher temperatures, the average highest temperature is around 9.2 ℃ (48.56 ℉). The average number of rainy days in January is 17.8. The average rainfall is 139 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 8:30 (hours and minutes), in the middle of the month 8:52 and at the end of the month 9:29.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in Washington (state) in February is this: The average highest temperature in Washington (state) in February is 9.9 ℃ (49.82 ℉). The average lowest temperature is 2.9 ℃ (37.22 ℉). At the beginning of February you can expect lower temperatures, the average highest temperature is around 9.2 ℃ (48.56 ℉). At the end of February you can expect higher temperatures, the average highest temperature is around 11 ℃ (51.8 ℉). The average number of rainy days in February is 14.4. The average rainfall is 86.8 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 9:29 (hours and minutes), in the middle of the month 10:14 and at the end of the month 11:04.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in Washington (state) in March is this: The average highest temperature in Washington (state) in March is 12.1 ℃ (53.78 ℉). The average lowest temperature is 4.3 ℃ (39.74 ℉). At the beginning of March you can expect lower temperatures, the average highest temperature is around 11 ℃ (51.8 ℉). At the end of March you can expect higher temperatures, the average highest temperature is around 13.55 ℃ (56.39 ℉). The average number of rainy days in March is 17.1. The average rainfall is 94 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 11:04 (hours and minutes), in the middle of the month 11:55 and at the end of the month 12:46.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.
Typical (usual) weather in Washington (state) in April is this: The average highest temperature in Washington (state) in April is 15 ℃ (59 ℉). The average lowest temperature is 6 ℃ (42.8 ℉). At the beginning of April you can expect lower temperatures, the average highest temperature is around 13.55 ℃ (56.39 ℉). At the end of April you can expect higher temperatures, the average highest temperature is around 16.6 ℃ (61.88 ℉). The average number of rainy days in April is 14.3. The average rainfall is 70.4 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 12:46 (hours and minutes), in the middle of the month 13:37 and at the end of the month 14:24.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in Washington (state) in May is this: The average highest temperature in Washington (state) in May is 18.2 ℃ (64.76 ℉). The average lowest temperature is 8.6 ℃ (47.48 ℉). At the beginning of May you can expect lower temperatures, the average highest temperature is around 16.6 ℃ (61.88 ℉). At the end of May you can expect higher temperatures, the average highest temperature is around 20 ℃ (68 ℉). The average number of rainy days in May is 12. The average rainfall is 49 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 14:24 (hours and minutes), in the middle of the month 15:06 and at the end of the month 15:38.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in Washington (state) in June is this: The average highest temperature in Washington (state) in June is 21.8 ℃ (71.24 ℉). The average lowest temperature is 11.1 ℃ (51.98 ℉). At the beginning of June you can expect lower temperatures, the average highest temperature is around 20 ℃ (68 ℉). At the end of June you can expect higher temperatures, the average highest temperature is around 23.3 ℃ (73.94 ℉). The average number of rainy days in June is 9.2. The average rainfall is 38.9 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 15:38 (hours and minutes), in the middle of the month 15:55 and at the end of the month 15:55.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.
Typical (usual) weather in Washington (state) in July is this: The average highest temperature in Washington (state) in July is 24.8 ℃ (76.64 ℉). The average lowest temperature is 13.6 ℃ (56.48 ℉). At the beginning of July you can expect lower temperatures, the average highest temperature is around 23.3 ℃ (73.94 ℉). At the end of July you can expect higher temperatures, the average highest temperature is around 24.85 ℃ (76.73 ℉). The average number of rainy days in July is 5. The average rainfall is 17.4 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 15:55 (hours and minutes), in the middle of the month 15:36 and at the end of the month 15:04.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in Washington (state) in August is this: The average highest temperature in Washington (state) in August is 24.9 ℃ (76.82 ℉). The average lowest temperature is 13.6 ℃ (56.48 ℉). At the beginning of August you can expect lower temperatures, the average highest temperature is around 24.85 ℃ (76.73 ℉). At the end of August you can expect lower temperatures, the average highest temperature is around 23.3 ℃ (73.94 ℉). The average number of rainy days in August is 4.7. The average rainfall is 22.7 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 15:04 (hours and minutes), in the middle of the month 14:22 and at the end of the month 13:35.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in Washington (state) in September is this: The average highest temperature in Washington (state) in September is 21.7 ℃ (71.06 ℉). The average lowest temperature is 11.5 ℃ (52.7 ℉). At the beginning of September you can expect higher temperatures, the average highest temperature is around 23.3 ℃ (73.94 ℉). At the end of September you can expect lower temperatures, the average highest temperature is around 18.7 ℃ (65.66 ℉). The average number of rainy days in September is 8.1. The average rainfall is 37.9 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 13:35 (hours and minutes), in the middle of the month 12:45 and at the end of the month 11:55.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in Washington (state) in October is this: The average highest temperature in Washington (state) in October is 15.7 ℃ (60.26 ℉). The average lowest temperature is 7.7 ℃ (45.86 ℉). At the beginning of October you can expect higher temperatures, the average highest temperature is around 18.7 ℃ (65.66 ℉). At the end of October you can expect lower temperatures, the average highest temperature is around 13.05 ℃ (55.49 ℉). The average number of rainy days in October is 13.1. The average rainfall is 89.8 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 11:55 (hours and minutes), in the middle of the month 11:04 and at the end of the month 10:15.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in Washington (state) in November is this: The average highest temperature in Washington (state) in November is 10.4 ℃ (50.72 ℉). The average lowest temperature is 4.5 ℃ (40.1 ℉). At the beginning of November you can expect higher temperatures, the average highest temperature is around 13.05 ℃ (55.49 ℉). At the end of November you can expect lower temperatures, the average highest temperature is around 9.05 ℃ (48.29 ℉). The average number of rainy days in November is 18.1. The average rainfall is 167.2 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 10:15 (hours and minutes), in the middle of the month 9:30 and at the end of the month 8:54.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in Washington (state) in December is this: The average highest temperature in Washington (state) in December is 7.7 ℃ (45.86 ℉). The average lowest temperature is 2.3 ℃ (36.14 ℉). At the beginning of December you can expect higher temperatures, the average highest temperature is around 9.05 ℃ (48.29 ℉). At the end of December you can expect higher temperatures, the average highest temperature is around 8.1 ℃ (46.58 ℉). The average number of rainy days in December is 17.7. The average rainfall is 133.7 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 8:54 (hours and minutes), in the middle of the month 8:31 and at the end of the month 8:27.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.| Seattle | temperature: - | highest temperature: 7.7 ℃ (45.86 ℉) | lowest temperature: 2.3 ℃ (36.14 ℉) | rainfall: 133.7mm | rainy days: 17.7 |
| Spokane | temperature: - | highest temperature: 0.3 ℃ (32.54 ℉) | lowest temperature: -5 ℃ (23 ℉) | rainfall: 57.9mm | rainy days: 13.5 |
| Yakima | temperature: - | highest temperature: 2.3 ℃ (36.14 ℉) | lowest temperature: -5.7 ℃ (21.74 ℉) | rainfall: 39.1mm | rainy days: 10.1 |
| Olympia | temperature: - | highest temperature: 6.9 ℃ (44.42 ℉) | lowest temperature: 0.5 ℃ (32.9 ℉) | rainfall: 194mm | rainy days: 19.8 |
| Tacoma | temperature: - | highest temperature: 8.5 ℃ (47.3 ℉) | lowest temperature: 2.3 ℃ (36.14 ℉) | rainfall: 142.6mm | rainy days: 18.4 |