Do you need to know, when is the best time to go to Oregon? Then you should take a look here, what weather you can expect there during the year.
Oregon 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: Albany, Aloha, Arch Cape, Ashland, Astoria, Aurora, Baker City, Bandon, Beaverton, Bend, Boardman, Boring, Brookings Harbor, Burns, Cannon Beach, Canyonville, Cascade Locks, Cave Junction, Central Oregon, Central Oregon Coast, Coos Bay, Corvallis, Cottage Grove, Crater Lake National Park, Creswell, Depoe Bay, Detroit Lake State Recreation Area, Dufur, Eastern Oregon, Enterprise, Eugene, Florence, Forest Grove, Fossil, Garibaldi, Gladstone, Gold Beach, Government Camp, Grand Ronde, Grants Pass, Gresham, Hermiston, Hillsboro, Hines, Hood River, Huntington, John Day, Joseph, Kimberly, Klamath Falls, La Grande, La Pine, Lake Billy Chinook, Lake Oswego, Lakeview, Lincoln City, Lorane, Lowell, Madras, McMinnville, Medford, Milton Freewater, Milwaukie, Monmouth, Mount Bachelor, Mount Hood, Mt. Angel, Mt. Hood and Columbia Gorge, Myrtle Point, Newberg, Newport, North Bend, Northern Oregon Coast, Ontario, Opal Creek, Oregon Caves National Monument, Oregon City, Oregon Coast, Oregon Dunes National Recreation Area, Pacific City, Pendleton, Port Orford, Portland, Portland Metropolitan Area, Prineville, Rainier, Redmond, Reedsport, Rockaway Beach, Roseburg, Salem, Seaside, Silverton, Sisters, Smith Rock State Park, Southern Oregon, Southern Oregon Coast, St. Helens, Sunriver, Sweet Home, Talent, The Dalles, Tigard, Tillamook, Tillamook State Forest, Toledo, Troutdale, Veneta, Waldo Lake, Waldport, Warm Springs, Warrenton, Willamette National Forest, Willamette Valley, Wilsonville, Woodburn, Yachats.
Let's look now what weather you can expect in the area around Portland and in many other cities. The warmest month here is August, the average maximum temperature is 27.8 ℃ (82.04 ℉). The average minimum temperature in this month is 14.5 ℃ (58.1 ℉). The coldest month here is December, the average maximum temperature is 7.7 ℃ (45.86 ℉). The average minimum temperature in this month is 2 ℃ (35.6 ℉). The most rainy month here is November, the average number of rainy days is 19.2. The least rainy month here is August, the average number of rainy days is 3.9. 
When travelling around Oregon, 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 Oregon in January is this: The average highest temperature in Oregon in January is 8.7 ℃ (47.66 ℉). The average lowest temperature is 2.3 ℃ (36.14 ℉). At the beginning of January you can expect lower temperatures, the average highest temperature is around 8.2 ℃ (46.76 ℉). At the end of January you can expect higher temperatures, the average highest temperature is around 9.75 ℃ (49.55 ℉). The average number of rainy days in January is 18.4. The average rainfall is 126 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 8:45 (hours and minutes), in the middle of the month 9:05 and at the end of the month 9:39.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 Oregon in February is this: The average highest temperature in Oregon in February is 10.8 ℃ (51.44 ℉). The average lowest temperature is 2.6 ℃ (36.68 ℉). At the beginning of February you can expect lower temperatures, the average highest temperature is around 9.75 ℃ (49.55 ℉). At the end of February you can expect higher temperatures, the average highest temperature is around 12.2 ℃ (53.96 ℉). The average number of rainy days in February is 14.7. The average rainfall is 93.2 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 9:39 (hours and minutes), in the middle of the month 10:21 and at the end of the month 11:07.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 Oregon in March is this: The average highest temperature in Oregon in March is 13.6 ℃ (56.48 ℉). The average lowest temperature is 4.5 ℃ (40.1 ℉). At the beginning of March you can expect lower temperatures, the average highest temperature is around 12.2 ℃ (53.96 ℉). At the end of March you can expect higher temperatures, the average highest temperature is around 15.2 ℃ (59.36 ℉). The average number of rainy days in March is 17.5. The average rainfall is 91.5 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 11:07 (hours and minutes), in the middle of the month 11:55 and at the end of the month 12:44.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 Oregon in April is this: The average highest temperature in Oregon in April is 16.8 ℃ (62.24 ℉). The average lowest temperature is 6.3 ℃ (43.34 ℉). At the beginning of April you can expect lower temperatures, the average highest temperature is around 15.2 ℃ (59.36 ℉). At the end of April you can expect higher temperatures, the average highest temperature is around 18.3 ℃ (64.94 ℉). The average number of rainy days in April is 16.2. The average rainfall is 70.9 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 12:44 (hours and minutes), in the middle of the month 13:31 and at the end of the month 14:15.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 Oregon in May is this: The average highest temperature in Oregon in May is 19.8 ℃ (67.64 ℉). The average lowest temperature is 9.3 ℃ (48.74 ℉). At the beginning of May you can expect lower temperatures, the average highest temperature is around 18.3 ℃ (64.94 ℉). At the end of May you can expect higher temperatures, the average highest temperature is around 21.4 ℃ (70.52 ℉). The average number of rainy days in May is 13.6. The average rainfall is 62.7 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 14:15 (hours and minutes), in the middle of the month 14:54 and at the end of the month 15:23.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 Oregon in June is this: The average highest temperature in Oregon in June is 23 ℃ (73.4 ℉). The average lowest temperature is 12 ℃ (53.6 ℉). At the beginning of June you can expect lower temperatures, the average highest temperature is around 21.4 ℃ (70.52 ℉). At the end of June you can expect higher temperatures, the average highest temperature is around 25.1 ℃ (77.18 ℉). The average number of rainy days in June is 9.4. The average rainfall is 43.4 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 15:23 (hours and minutes), in the middle of the month 15:39 and at the end of the month 15:39.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 Oregon in July is this: The average highest temperature in Oregon in July is 27.2 ℃ (80.96 ℉). The average lowest temperature is 14.4 ℃ (57.92 ℉). At the beginning of July you can expect lower temperatures, the average highest temperature is around 25.1 ℃ (77.18 ℉). At the end of July you can expect higher temperatures, the average highest temperature is around 27.5 ℃ (81.5 ℉). The average number of rainy days in July is 4.1. The average rainfall is 16.1 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 15:39 (hours and minutes), in the middle of the month 15:22 and at the end of the month 14:52.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 Oregon in August is this: The average highest temperature in Oregon in August is 27.8 ℃ (82.04 ℉). The average lowest temperature is 14.5 ℃ (58.1 ℉). At the beginning of August you can expect lower temperatures, the average highest temperature is around 27.5 ℃ (81.5 ℉). At the end of August you can expect lower temperatures, the average highest temperature is around 26.2 ℃ (79.16 ℉). The average number of rainy days in August is 3.9. The average rainfall is 17.3 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 14:52 (hours and minutes), in the middle of the month 14:13 and at the end of the month 13:29.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 Oregon in September is this: The average highest temperature in Oregon in September is 24.6 ℃ (76.28 ℉). The average lowest temperature is 12 ℃ (53.6 ℉). At the beginning of September you can expect higher temperatures, the average highest temperature is around 26.2 ℃ (79.16 ℉). At the end of September you can expect lower temperatures, the average highest temperature is around 21.35 ℃ (70.43 ℉). The average number of rainy days in September is 6.6. The average rainfall is 37 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 13:29 (hours and minutes), in the middle of the month 12:43 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 Oregon in October is this: The average highest temperature in Oregon in October is 18.1 ℃ (64.58 ℉). The average lowest temperature is 7.9 ℃ (46.22 ℉). At the beginning of October you can expect higher temperatures, the average highest temperature is around 21.35 ℃ (70.43 ℉). At the end of October you can expect lower temperatures, the average highest temperature is around 15.05 ℃ (59.09 ℉). The average number of rainy days in October is 12.7. The average rainfall is 77 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 11:08 and at the end of the month 10:22.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 Oregon in November is this: The average highest temperature in Oregon in November is 12 ℃ (53.6 ℉). The average lowest temperature is 4.8 ℃ (40.64 ℉). At the beginning of November you can expect higher temperatures, the average highest temperature is around 15.05 ℃ (59.09 ℉). At the end of November you can expect lower temperatures, the average highest temperature is around 9.85 ℃ (49.73 ℉). The average number of rainy days in November is 19.2. The average rainfall is 143.1 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 10:22 (hours and minutes), in the middle of the month 9:40 and at the end of the month 9:06.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 Oregon in December is this: The average highest temperature in Oregon in December is 7.7 ℃ (45.86 ℉). The average lowest temperature is 2 ℃ (35.6 ℉). At the beginning of December you can expect higher temperatures, the average highest temperature is around 9.85 ℃ (49.73 ℉). At the end of December you can expect higher temperatures, the average highest temperature is around 8.2 ℃ (46.76 ℉). The average number of rainy days in December is 18.6. The average rainfall is 142.5 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 9:06 (hours and minutes), in the middle of the month 8:45 and at the end of the month 8:42.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.| Eugene | temperature: - | highest temperature: 7.8 ℃ (46.04 ℉) | lowest temperature: 1.2 ℃ (34.16 ℉) | rainfall: 201.3mm | rainy days: 18.1 |
| Medford | temperature: - | highest temperature: 7.8 ℃ (46.04 ℉) | lowest temperature: 0.6 ℃ (33.08 ℉) | rainfall: 88.2mm | rainy days: 14.6 |
| Pendleton | temperature: - | highest temperature: 6 ℃ (42.8 ℉) | lowest temperature: -2.7 ℃ (27.14 ℉) | rainfall: 37.7mm | rainy days: - |
| Portland | temperature: - | highest temperature: 7.7 ℃ (45.86 ℉) | lowest temperature: 2 ℃ (35.6 ℉) | rainfall: 142.5mm | rainy days: 18.6 |
| Salem | temperature: - | highest temperature: 7.9 ℃ (46.22 ℉) | lowest temperature: 1.3 ℃ (34.34 ℉) | rainfall: 172.5mm | rainy days: 17.9 |