Ulan Bator climate
Ulan Bator is warmest in July, with average highs of 24 °C, and coldest in January, when nights average -25 °C. July is the wettest month (69 mm) and January the driest (1.6 mm). Figures are 1991–2020 climate normals.
Across a full year Ulan Bator averages 321 mm of rain, 27 days above 25 °C and 221 days below freezing.
Mongolia · population 844,818 · 1991–2020 normals
Temperature below 0 °C to above 30 °C Rain band height is that month’s share of the wettest month
- Warmest month July 24 °C
- Coldest month January -25 °C
- Driest month January 2 mm
- Wettest month July 69 mm
- Least cloud October 39 % cloud
- Hottest on record July 38 °C
- Coldest on record January -42 °C
What to expectUlan Bator through the year
Ulan Bator has a clear annual cycle: average daily highs run from -13 °C in January to 24 °C in July, a swing of 37 °C in mean temperature across the year.
Counted across a normal year, 27 days a year reach 25 °C, 4 of them reach 30 °C, 221 nights drop below freezing. The warmest reading in the 1991–2020 record is 38 °C, in July.
Rain is strongly seasonal. July averages 69 mm against 2 mm in January — 44 times as much. Planning around the dry months matters more here than planning around temperature.
Month by month
| Month | Avg high | Rainfall | Cloud |
|---|---|---|---|
| January | -12.5 °C | 2 mm | 40 % |
| February | -7.6 °C | 3 mm | 41 % |
| March | 0.8 °C | 7 mm | 43 % |
| April | 8.7 °C | 17 mm | 50 % |
| May | 15.7 °C | 35 mm | 53 % |
| June | 21.4 °C | 56 mm | 60 % |
| July | 23.7 °C | 69 mm | 59 % |
| August | 21.6 °C | 69 mm | 56 % |
| September | 15.5 °C | 39 mm | 47 % |
| October | 6.4 °C | 15 mm | 39 % |
| November | -3.8 °C | 6 mm | 42 % |
| December | -10.9 °C | 2 mm | 42 % |
Temperature month by month
| Month | Avg high | Avg low | Mean | Record high | Record low | Days above 25 °C | Days above 30 °C | Days below 0 °C |
|---|---|---|---|---|---|---|---|---|
| January | -12.5 °C | -25.4 °C | -19.1 °C | -0.3 °C | -41.7 °C | 0 | 0 | 31 |
| February | -7.6 °C | -21.9 °C | -14.4 °C | 9.7 °C | -35.2 °C | 0 | 0 | 28 |
| March | 0.8 °C | -12.4 °C | -5.4 °C | 17.6 °C | -32.0 °C | 0 | 0 | 31 |
| April | 8.7 °C | -3.4 °C | 2.7 °C | 27.6 °C | -18.1 °C | 0 | 0 | 24 |
| May | 15.7 °C | 2.2 °C | 9.3 °C | 31.2 °C | -11.1 °C | 2 | 0 | 10 |
| June | 21.4 °C | 8.8 °C | 15.5 °C | 35.5 °C | -2.9 °C | 7 | 1 | 0 |
| July | 23.7 °C | 12.2 °C | 18.2 °C | 37.5 °C | 3.4 °C | 11 | 2 | 0 |
| August | 21.6 °C | 9.9 °C | 15.9 °C | 35.0 °C | 0.2 °C | 7 | 1 | 0 |
| September | 15.5 °C | 2.9 °C | 9.3 °C | 28.5 °C | -8.1 °C | 1 | 0 | 7 |
| October | 6.4 °C | -4.4 °C | 0.7 °C | 20.1 °C | -23.4 °C | 0 | 0 | 29 |
| November | -3.8 °C | -14.2 °C | -9.1 °C | 10.6 °C | -34.6 °C | 0 | 0 | 30 |
| December | -10.9 °C | -21.5 °C | -16.3 °C | 2.9 °C | -35.1 °C | 0 | 0 | 31 |
Rain, sun and wind month by month
| Month | Rainfall | Wet days | Daylight | Cloud cover | Humidity | Wind |
|---|---|---|---|---|---|---|
| January | 2 mm | 1 | 8.8 h/day | 40 % | 68 % | 12 km/h |
| February | 3 mm | 1 | 10 h/day | 41 % | 64 % | 14 km/h |
| March | 7 mm | 2 | 12 h/day | 43 % | 47 % | 17 km/h |
| April | 17 mm | 5 | 14 h/day | 50 % | 44 % | 20 km/h |
| May | 35 mm | 6 | 15 h/day | 53 % | 48 % | 20 km/h |
| June | 56 mm | 10 | 16 h/day | 60 % | 57 % | 17 km/h |
| July | 69 mm | 11 | 16 h/day | 59 % | 63 % | 15 km/h |
| August | 69 mm | 11 | 14 h/day | 56 % | 65 % | 15 km/h |
| September | 39 mm | 8 | 13 h/day | 47 % | 62 % | 16 km/h |
| October | 15 mm | 4 | 11 h/day | 39 % | 59 % | 15 km/h |
| November | 6 mm | 2 | 9.3 h/day | 42 % | 61 % | 13 km/h |
| December | 2 mm | 1 | 8.4 h/day | 42 % | 65 % | 12 km/h |
Where Ulan Bator ranks
| Ranking | Position | Value |
|---|---|---|
| The coolest places in Asia in October | 2nd of 50 | 6.4 °C |
| The coolest places in Asia in September | 2nd of 50 | 16 °C |
| The coolest places in Asia in November | 4th of 50 | -3.8 °C |
| The coolest places in Asia year-round | 4th of 50 | 6.6 °C |
| Places with the best weather in Asia in July | 5th of 50 | 89/100 |
| The coolest places in Asia in April | 7th of 50 | 8.7 °C |
Planning a trip? See the best time to visit Ulan Bator.
QuestionsCommon questions about Ulan Bator’s climate
When is the best time to visit Ulan Bator?
That depends on what you want, so the honest answer is a comparison rather than a single month. June, July, August sit closest to 20 °C on average, July is the warmest month and January the driest. The month-by-month table above has the full picture.
How hot does Ulan Bator get?
In July, the warmest month, daily highs average 24 °C. About 4 days a year pass 30 °C. The highest value in the 1991–2020 record is 38 °C.
How cold does it get in winter?
Nights average -25 °C in January, the coldest month. A normal year has 221 nights below freezing.
Which month is wettest in Ulan Bator?
July, averaging 69 mm over 11 days with rain. The driest month is January with 2 mm. The year as a whole averages 321 mm.
Are these figures a forecast?
No. They are 1991–2020 climate normals: the average of thirty years, which describes what a month is usually like in Ulan Bator rather than what any particular week will bring. Individual years can differ substantially from the normal.
Data sources and method
- ERA5 / ERA5-Land reanalysis — Copernicus Climate Change Service (C3S), ECMWF. Copernicus Licence
- Open-Meteo — Open-Meteo.com. CC BY 4.0
- NOAA OISST v2.1 — NOAA Physical Sciences Laboratory. Public domain
- GeoNames — GeoNames.org. CC BY 4.0
- Normal period
- 1991–2020
- Data point
- 47.908°, 106.883° (the coordinates the reanalysis values are taken for)
- Dataset version
- era5-1991-2020-scores1.1
- Last processed
Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: monthly rankings, daylight hours, beach and comfort scores. Full formulas are on the methodology page.
Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.