Mongolia weather in September 2025

Expect 15°C daytime maximum temperatures in the shade with on average 8 hours of sunshine per day in Mongolia in September. Check more long-term weather averages for Mongolia in September before you book your next holiday to Mongolia in 2025/2026.

  • 15°C maximum daytime temperature in September in Mongolia (Ulaanbaatar)15
    15°C max day temperature
  • 8 hours of sunshine per day
  • 9 days with some rainfall in September in Mongolia (Ulaanbaatar)9
    9 days with some rainfall
  • 1°C minimum night-time temperature in September in Mongolia (Ulaanbaatar)1
    1°C min night temperature
  • 13 hours of daylight per day in September in Mongolia (Ulaanbaatar)13
    13 hours of daylight per day
  • No heat & humidity in September in Mongolia (Ulaanbaatar)0
    No heat & humidity
  • 42 mm monthly rainfall in September in Mongolia (Ulaanbaatar)42
    42 mm of monthly rainfall
  • UV (maximum) index 5 (Moderate) in September in Mongolia (Ulaanbaatar)5
    5 (Moderate) UV index

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The September weather guide for Mongolia (Ulaanbaatar) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Top Mongolia destinations

Below are average maximum temperatures at popular countries, regions and places in Mongolia in September. Select a holiday destination to see more weather parameters.

All Mongolia destinations

Metric (°C / mm)  |  Imperial (°F / inches)

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How warm is it in Mongolia in September?

Daytime temperatures usually reach 15°C in Ulaanbaatar, Mongolia in September, falling to 1°C at night.

How sunny is it in Mongolia in September?

There are normally 8 hours of bright sunshine each day in Ulaanbaatar, Mongolia in September - that's 66% of daylight hours.

Does it rain in Mongolia in September?

There are usually 9 days with some rain in Ulaanbaatar, Mongolia in September and the average monthly rainfall is 42mm.

Mongolia September sunrise & sunset times

Browse the sunrise and sunset times for Mongolia in September 2025. Select a month to view Mongolia sunrise and sunset times for the next 12 months. The Mongolia sunrise and sunset times shown below are for Ulaanbaatar.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 06:10 19:34
Monday, 15th September 2025 06:29 19:05
Tuesday, 30th September 2025 06:50 18:34

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