St Gallen weather in September 2025

Expect 18°C daytime maximum temperatures in the shade with on average 6 hours of sunshine per day in St Gallen in September. Check more long-term weather averages for St Gallen in September before you book your next holiday to Switzerland in 2025/2026.

  • 18°C maximum daytime temperature in September in St Gallen18
    18°C max day temperature
  • 6 hours of sunshine per day
  • 13 days with some rainfall in September in St Gallen13
    13 days with some rainfall
  • 9°C minimum night-time temperature in September in St Gallen9
    9°C min night temperature
  • 13 hours of daylight per day in September in St Gallen13
    13 hours of daylight per day
  • No heat & humidity in September in St Gallen0
    No heat & humidity
  • 94 mm monthly rainfall in September in St Gallen94
    94 mm of monthly rainfall
  • UV (maximum) index 5 (Moderate) in September in St Gallen5
    5 (Moderate) UV index

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The September weather guide for Switzerland (St Gallen) 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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More about Switzerland

How hot is it in St Gallen in September?

Daytime temperatures usually reach 18°C in St Gallen in September, falling to 9°C at night.

How sunny is it in St Gallen in September?

There are normally 6 hours of bright sunshine each day in St Gallen in September - that's 45% of daylight hours.

Does it rain in St Gallen in September?

There are usually 13 days with some rain in St Gallen in September and the average monthly rainfall is 94mm.

St Gallen September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:41 19:03
Monday, 15th September 2025 06:00 18:34
Tuesday, 30th September 2025 06:20 18:04

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