Do you need to know, when is the best time to go to Mongolia? Then you should take a look here, what weather you can expect there during the year.
The climate of Mongolia is generally cold and dry, continental. You can expect large daily and seasonal variations of temperature. Winters are cold and summers are short here, most precipitation occurs during summer and is highest in the north. The south is very dry.
When speaking about the usual weather in this state, the information is relevant for example for these popular places: Altai, Altai Tavan Bogd National Park, Arvayheer, Baruun Urt, Bayanhongor, Bulgan, Central Mongolia, Choibalsan, Dalanzadgad, Darkhan, Eastern Mongolia, Erdenet, Gobi, Gobi Gurvan Saikhan National Park, Gorkhi Terelj National Park, Gun Galuut Nature Reserve, Hovd, Hutag Ondor, Karakorum, Khognokhan Natural Reserve, Khustain Nuruu National Park, Mandalgovĭ, Mörön, Northern Mongolia, Ondorkhaan, Sainshand, Sühbaatar, Tsambagarav National Park, Tsetserleg, Ulaanbaatar, Ulaangom, Uliastai, Western Mongolia, Zamyn Üüd, Zuunmod, Ölgii.
Let's look now what weather you can expect in the area around the capital and in many other cities. The warmest month here is July, the average maximum temperature is 21.5 ℃ (70.7 ℉). The average minimum temperature in this month is 10.3 ℃ (50.54 ℉). The coldest month here is January, the average maximum temperature is -14 ℃ (6.8 ℉). The average minimum temperature in this month is -25.4 ℃ (-13.72 ℉). The most rainy month here is July, the average number of rainy days is 17.7. The least rainy month here is February, the average number of rainy days is 4.9. 
When travelling to some places in Mongolia, always consider the altitude of the the place as well. The highest point here is Nayramadlin Orgil (Khuiten Peak) (4374 m) and the lowest point is Hoh Nuur (560 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 Mongolia in January is this: The average highest temperature in Mongolia in January is -14 ℃ (6.8 ℉). The average lowest temperature is -25.4 ℃ (-13.72 ℉). At the beginning of January you can expect higher temperatures, the average highest temperature is around -12.75 ℃ (9.05 ℉). At the end of January you can expect higher temperatures, the average highest temperature is around -11.45 ℃ (11.39 ℉). The average number of rainy days in January is 6.8. The average rainfall is 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 8:26 (hours and minutes), in the middle of the month 8:49 and at the end of the month 9:26.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 Mongolia in February is this: The average highest temperature in Mongolia in February is -8.9 ℃ (15.98 ℉). The average lowest temperature is -21.1 ℃ (-5.98 ℉). At the beginning of February you can expect lower temperatures, the average highest temperature is around -11.45 ℃ (11.39 ℉). At the end of February you can expect higher temperatures, the average highest temperature is around -4.75 ℃ (23.45 ℉). The average number of rainy days in February is 4.9. The average rainfall is 1.9 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 9:26 (hours and minutes), in the middle of the month 10:12 and at the end of the month 11:02.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 Mongolia in March is this: The average highest temperature in Mongolia in March is -0.6 ℃ (30.92 ℉). The average lowest temperature is -13.6 ℃ (7.52 ℉). At the beginning of March you can expect lower temperatures, the average highest temperature is around -4.75 ℃ (23.45 ℉). At the end of March you can expect higher temperatures, the average highest temperature is around 4.25 ℃ (39.65 ℉). The average number of rainy days in March is 6.9. The average rainfall is 3.4 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 11:02 (hours and minutes), in the middle of the month 11:55 and at the end of the month 12:47.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 Mongolia in April is this: The average highest temperature in Mongolia in April is 9.1 ℃ (48.38 ℉). The average lowest temperature is -5 ℃ (23 ℉). At the beginning of April you can expect lower temperatures, the average highest temperature is around 4.25 ℃ (39.65 ℉). At the end of April you can expect higher temperatures, the average highest temperature is around 13.05 ℃ (55.49 ℉). The average number of rainy days in April is 8. The average rainfall is 8.4 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 12:47 (hours and minutes), in the middle of the month 13:38 and at the end of the month 14:27.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.
Typical (usual) weather in Mongolia in May is this: The average highest temperature in Mongolia in May is 17 ℃ (62.6 ℉). The average lowest temperature is 2.5 ℃ (36.5 ℉). At the beginning of May you can expect lower temperatures, the average highest temperature is around 13.05 ℃ (55.49 ℉). At the end of May you can expect higher temperatures, the average highest temperature is around 19.1 ℃ (66.38 ℉). The average number of rainy days in May is 7.9. The average rainfall is 13.7 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 14:27 (hours and minutes), in the middle of the month 15:09 and at the end of the month 15:42.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.Typical (usual) weather in Mongolia in June is this: The average highest temperature in Mongolia in June is 21.2 ℃ (70.16 ℉). The average lowest temperature is 7.9 ℃ (46.22 ℉). At the beginning of June you can expect lower temperatures, the average highest temperature is around 19.1 ℃ (66.38 ℉). At the end of June you can expect higher temperatures, the average highest temperature is around 21.35 ℃ (70.43 ℉). The average number of rainy days in June is 14.1. The average rainfall is 50.3 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 15:42 (hours and minutes), in the middle of the month 16:00 and at the end of the month 15:59.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 Mongolia in July is this: The average highest temperature in Mongolia in July is 21.5 ℃ (70.7 ℉). The average lowest temperature is 10.3 ℃ (50.54 ℉). At the beginning of July you can expect lower temperatures, the average highest temperature is around 21.35 ℃ (70.43 ℉). At the end of July you can expect lower temperatures, the average highest temperature is around 20.7 ℃ (69.26 ℉). The average number of rainy days in July is 17.7. The average rainfall is 64.6 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 15:59 (hours and minutes), in the middle of the month 15:40 and at the end of the month 15:07.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 Mongolia in August is this: The average highest temperature in Mongolia in August is 19.9 ℃ (67.82 ℉). The average lowest temperature is 7.6 ℃ (45.68 ℉). At the beginning of August you can expect higher temperatures, the average highest temperature is around 20.7 ℃ (69.26 ℉). At the end of August you can expect lower temperatures, the average highest temperature is around 17.35 ℃ (63.23 ℉). The average number of rainy days in August is 15.7. The average rainfall is 77.8 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 15:07 (hours and minutes), in the middle of the month 14:25 and at the end of the month 13:37.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 Mongolia in September is this: The average highest temperature in Mongolia in September is 14.8 ℃ (58.64 ℉). The average lowest temperature is 1.7 ℃ (35.06 ℉). At the beginning of September you can expect higher temperatures, the average highest temperature is around 17.35 ℃ (63.23 ℉). At the end of September you can expect lower temperatures, the average highest temperature is around 11.6 ℃ (52.88 ℉). The average number of rainy days in September is 9.8. The average rainfall is 32.6 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 13:37 (hours and minutes), in the middle of the month 12:46 and at the end of the month 11:54.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 Mongolia in October is this: The average highest temperature in Mongolia in October is 8.4 ℃ (47.12 ℉). The average lowest temperature is -4.5 ℃ (23.9 ℉). At the beginning of October you can expect higher temperatures, the average highest temperature is around 11.6 ℃ (52.88 ℉). At the end of October you can expect lower temperatures, the average highest temperature is around 2.55 ℃ (36.59 ℉). The average number of rainy days in October is 7.1. The average rainfall is 8.5 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 11:54 (hours and minutes), in the middle of the month 11:03 and at the end of the month 10:13.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 Mongolia in November is this: The average highest temperature in Mongolia in November is -3.3 ℃ (26.06 ℉). The average lowest temperature is -14.5 ℃ (5.9 ℉). At the beginning of November you can expect higher temperatures, the average highest temperature is around 2.55 ℃ (36.59 ℉). At the end of November you can expect lower temperatures, the average highest temperature is around -7.4 ℃ (18.68 ℉). The average number of rainy days in November is 8. The average rainfall is 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 10:13 (hours and minutes), in the middle of the month 9:27 and at the end of the month 8:50.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 Mongolia in December is this: The average highest temperature in Mongolia in December is -11.5 ℃ (11.3 ℉). The average lowest temperature is -21.3 ℃ (-6.34 ℉). At the beginning of December you can expect higher temperatures, the average highest temperature is around -7.4 ℃ (18.68 ℉). At the end of December you can expect lower temperatures, the average highest temperature is around -12.75 ℃ (9.05 ℉). The average number of rainy days in December is 8.8. The average rainfall is 3.2 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 8:50 (hours and minutes), in the middle of the month 8:27 and at the end of the month 8:23.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.| Ulaanbaatar | temperature: - | highest temperature: -11.5 ℃ (11.3 ℉) | lowest temperature: -21.3 ℃ (-6.34 ℉) | rainfall: 3.2mm | rainy days: 8.8 |
| Khovd | temperature: - | highest temperature: -11.7 ℃ (10.94 ℉) | lowest temperature: -24.4 ℃ (-11.92 ℉) | rainfall: 1.5mm | rainy days: 4.1 |
| Darkhan | temperature: - | highest temperature: -11.7 ℃ (10.94 ℉) | lowest temperature: -25.8 ℃ (-14.44 ℉) | rainfall: 5.2mm | rainy days: 7.8 |
| Erdenet | temperature: - | highest temperature: -8.4 ℃ (16.88 ℉) | lowest temperature: -18.3 ℃ (-0.94 ℉) | rainfall: 3.6mm | rainy days: 5.9 |
| Dalanzadgad | temperature: - | highest temperature: -4.3 ℃ (24.26 ℉) | lowest temperature: -17 ℃ (1.4 ℉) | rainfall: 1.1mm | rainy days: 4.1 |