Climate averages 1991–2020
Darhan weather
in September.
A mild, fairly dry month: the 5th warmest and the 9th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a mild month in Darhan: daytime highs average 17.9°C and nights cool to about 6.2°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 39 mm of rain on roughly 7 days, which makes September a fairly dry month (the 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 40 min on an average September day.
The nearest other city in this atlas is Erdenet (143 km away). In September its highs average 14.8°C, 3.1°C cooler than Darhan, with 38 mm of rain.
Among the 3 cities listed in Mongolia, Darhan ranks 1st of 3 for the warmest September highs and joint 2nd of 3 for the driest September (rainfall, lowest first). The mean September high of those 3 cities is 16.1°C; Darhan is 1.8°C warmer than that mean.
From September to October, average highs fall by 9.3°C to 8.6°C, and monthly rainfall falls from 39 mm to 18 mm.
The annual picture
September 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
Darhan climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | -12.9°C-24.8°C | -24.8°C | 1.6 | 0.5 | 8.79 h |
| February | -6.8°C-21.4°C | -21.4°C | 2.5 | 0.7 | 10.110 h |
| March | 3.1°C-9.9°C | -9.9°C | 6.7 | 2.1 | 11.912 h |
| April | 11.9°C-1.6°C | -1.6°C | 18 | 4.2 | 13.714 h |
| May | 19.1°C4.5°C | 4.5°C | 33 | 6.3 | 15.315 h |
| June | 25.4°C12.6°C | 12.6°C | 51 | 8.3 | 16.216 h |
| July | 27.2°C15.9°C | 15.9°C | 68 | 10.7 | 15.816 h |
| August | 24.6°C13.4°C | 13.4°C | 78 | 10.4 | 14.414 h |
| September, selected | 17.9°C6.2°C | 6.2°C | 39 | 7.4 | 12.713 h |
| October | 8.6°C-2.3°C | -2.3°C | 18 | 3.9 | 10.811 h |
| November | -2.3°C-11.7°C | -11.7°C | 8.2 | 2.6 | 9.29 h |
| December | -10.8°C-20.6°C | -20.6°C | 4.1 | 1.5 | 8.28 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
September in nearby cities
- Erdenet in SeptemberMongolia · 143 kmHigh 14.8°C · Low 4.4°C · 38 mm rain
- Ulan Bator in SeptemberMongolia · 189 kmHigh 15.6°C · Low 3.0°C · 39 mm rain
- Ulan-Ude in SeptemberRussia · 286 kmHigh 15.6°C · Low 5.2°C · 44 mm rain
- Irkutsk in SeptemberRussia · 333 kmHigh 15.4°C · Low 5.8°C · 61 mm rain
- Angarsk in SeptemberRussia · 369 kmHigh 15.5°C · Low 5.5°C · 51 mm rain
- Usol’ye-Sibirskoye in SeptemberRussia · 396 kmHigh 15.3°C · Low 5.5°C · 53 mm rain
- Chita in SeptemberRussia · 603 kmHigh 14.7°C · Low 3.9°C · 47 mm rain
- Bratsk in SeptemberRussia · 793 kmHigh 12.0°C · Low 6.8°C · 42 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 Darhan) is explained once on the Darhan year overview and on the Sources, method and limits page.