Climate averages 1991–2020
Ulan Bator weather
in August.
A mild, moderately wet month: the 2nd warmest and the wettest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a mild month in Ulan Bator: daytime highs average 21.7°C and nights cool to about 9.8°C. By daytime temperature it is the 2nd warmest of the 12 months.
Expect about 68 mm of rain on roughly 11 days, which makes August a moderately wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 14 h 18 min on an average August day.
The nearest other city in this atlas is Darhan (189 km away). In August its highs average 24.6°C, 2.9°C warmer than Ulan Bator, with 78 mm of rain.
Among the 3 cities listed in Mongolia, Ulan Bator ranks 2nd of 3 for the warmest August highs and 1st of 3 for the driest August (rainfall, lowest first). The mean August high of those 3 cities is 22.3°C; Ulan Bator is 0.7°C cooler than that mean.
From August to September, average highs fall by 6.1°C to 15.6°C, and monthly rainfall falls from 68 mm to 39 mm.
The annual picture
August in context
Monthly precipitation
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Ulan Bator climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | -12.4°C-24.8°C | -24.8°C | 1.5 | 0.5 | 8.99 h |
| February | -7.4°C-21.2°C | -21.2°C | 2.8 | 1.2 | 10.210 h |
| March | 0.9°C-11.9°C | -11.9°C | 7.3 | 2.2 | 11.912 h |
| April | 8.8°C-3.6°C | -3.6°C | 16 | 4.3 | 13.614 h |
| May | 15.8°C1.7°C | 1.7°C | 34 | 6.7 | 15.115 h |
| June | 21.4°C8.4°C | 8.4°C | 55 | 9.5 | 16.016 h |
| July | 23.7°C11.9°C | 11.9°C | 66 | 11.2 | 15.616 h |
| August, selected | 21.7°C9.8°C | 9.8°C | 68 | 10.7 | 14.314 h |
| September | 15.6°C3.0°C | 3.0°C | 39 | 7.2 | 12.613 h |
| October | 6.5°C-4.1°C | -4.1°C | 15 | 3.8 | 10.911 h |
| November | -3.7°C-13.5°C | -13.5°C | 6.1 | 2.1 | 9.39 h |
| December | -10.8°C-20.9°C | -20.9°C | 2.1 | 0.9 | 8.58 h |
Precipitation (rain or snow, as water) is the average of the 30 separate monthly totals. A wet day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
August in nearby cities
- Darhan in AugustMongolia · 189 kmHigh 24.6°C · Low 13.4°C · 78 mm rain
- Erdenet in AugustMongolia · 241 kmHigh 20.7°C · Low 11.0°C · 86 mm rain
- Ulan-Ude in AugustRussia · 439 kmHigh 23.1°C · Low 12.3°C · 68 mm rain
- Irkutsk in AugustRussia · 522 kmHigh 22.2°C · Low 12.4°C · 101 mm rain
- Angarsk in AugustRussia · 559 kmHigh 22.6°C · Low 12.5°C · 85 mm rain
- Usol’ye-Sibirskoye in AugustRussia · 585 kmHigh 22.6°C · Low 12.6°C · 86 mm rain
- Chita in AugustRussia · 659 kmHigh 21.9°C · Low 11.6°C · 83 mm rain
- Bayan Nur in AugustChina · 798 kmHigh 29.5°C · Low 17.1°C · 49 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Ulan Bator) is explained once on the Ulan Bator year overview and on the Sources, method and limits page.