Altai weather in September 2025

Expect 14°C daytime maximum temperatures in the shade with on average 9 hours of sunshine per day in Altai in September. Check more long-term weather averages for Altai in September before you book your next holiday to Mongolia in 2025/2026.

  • 14°C maximum daytime temperature in September in Altai14
    14°C max day temperature
  • 9 hours of sunshine per day
  • 7 days with some rainfall in September in Altai7
    7 days with some rainfall
  • 1°C minimum night-time temperature in September in Altai1
    1°C min night temperature
  • 13 hours of daylight per day in September in Altai13
    13 hours of daylight per day
  • No heat & humidity in September in Altai0
    No heat & humidity
  • 16 mm monthly rainfall in September in Altai16
    16 mm of monthly rainfall
  • UV (maximum) index 5 (Moderate) in September in Altai5
    5 (Moderate) UV index

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The September weather guide for Mongolia (Altai) 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.

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

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How warm is it in Altai in September?

Daytime temperatures usually reach 14°C in Altai in September, falling to 1°C at night.

How sunny is it in Altai in September?

There are normally 9 hours of bright sunshine each day in Altai in September - that's 73% of daylight hours.

Does it rain in Altai in September?

There are usually 7 days with some rain in Altai in September and the average monthly rainfall is 16mm.

Altai September sunrise & sunset times

Browse the sunrise and sunset times for Altai in September 2025. Select a month to view Altai sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 06:55 20:14
Monday, 15th September 2025 07:13 19:47
Tuesday, 30th September 2025 07:32 19:17

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