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Climate · Ulaanbaatar

Ulaanbaatar in September

Mild and mostly dry, as the days shorten.

Typical weather, averaged over 30 years

September in Ulaanbaatar is mild: highs near 65°F, lows near 37°F. Rain falls on about two days a week, and the days shorten by 1 hour 15 minutes from the first week to the last.September in Ulaanbaatar is mild: highs near 18°C, lows near 3°C. Rain falls on about two days a week, and the days shorten by 1 hour 15 minutes from the first week to the last.

High
65°F18°Caverage
Low
37°F3°Caverage
Wet days
2a week · 25% of days
Daylight
12h 28mon average

Is September a good time to visit Ulaanbaatar?

September sits outside Ulaanbaatar's best months, which run from June to August. Expect mild days and rain on about two days a week.

How we judge it: every month is scored on how close its typical high comes to the range from 70°F to 80°F, how mild its nights are, and how rarely it rains. The best months are the run of months that scores best.How we judge it: every month is scored on how close its typical high comes to the range from 21°C to 27°C, how mild its nights are, and how rarely it rains. The best months are the run of months that scores best.

How September sits in the year

week by week

Temperature

Highs near 65°F in September, against 12°F to 78°F through the year.Highs near 18°C in September, against -11°C to 26°C through the year.

Chance of a wet day

25% of days in September, against 3% to 37% through the year.

Cloud cover

40% cover in September, against 40% to 50% through the year.

Daylight

12h 28m in September, against 8h 27m to 15h 57m through the year.

Week by week, lightly smoothed, with September shaded. The olive line marks the best months. Hover or tap a week for its figures.

Either side

  1. August75°24°low 49°low 9°3 wet days a weekRain on about three days a week.
  2. September65°18°low 37°low 3°2 wet days a weekRain on about two days a week.
  3. October49°9°low 25°low -4°1 wet day a weekRain on about one day a week.

Where Ulaanbaatar sits, in September

Asia/Ulaanbaatar
this place
typical high in September 40°F4°C95°F35°C
Sunrise, mid-September
6:28 AMsets 7:08 PM
Above the sea
1,290 mupland
Latitude
47.9°Nnorthern hemisphere
Nearest of ours
Bulgan511 km south-west

The land around Ulaanbaatar, shaded by its typical high in September, the planning map's own layer. Hover the map for the figure at that spot; tap it on a phone. Clock times are local, for the 15th.

Elsewhere in Mongolia in September

high · low · wet days
See September on the planning mapThe whole year in Ulaanbaatar

Typical weather, averaged over 30 years (1995–2024), from the 11 km grid square nearest Ulaanbaatar. Temperatures are adjusted against 66 weather stations: daytime highs read about 3.1°F cold in the source data and are raised to match, and both highs and lows are adjusted for the town's height (1,290 m) against the climate model's (1,502 m).Temperatures are adjusted against 66 weather stations: daytime highs read about 1.7°C cold in the source data and are raised to match, and both highs and lows are adjusted for the town's height (1,290 m) against the climate model's (1,502 m). Daylight is calculated from latitude. Charts are lightly smoothed week to week; the figures in the table are not. Source: Copernicus ERA5-Land reanalysis; cloud cover from NASA's MERRA-2 reanalysis, on a coarser grid of about 50 km. Contains modified Copernicus Climate Change Service information 2026; neither the European Commission nor ECMWF is responsible for any use of it. These are averages, not a forecast.

Daylight is calculated from latitude. Charts are lightly smoothed week to week; the figures in the table are not.

Source: Copernicus ERA5-Land reanalysis; cloud cover from NASA's MERRA-2 reanalysis, on a coarser grid of about 50 km. Contains modified Copernicus Climate Change Service information 2026; neither the European Commission nor ECMWF is responsible for any use of it. These are averages, not a forecast.