Gdansk weather in September 2025

Expect 15°C daytime maximum temperatures in the shade with on average 5 hours of sunshine per day in Gdansk in September. Check more long-term weather averages for Gdansk in September before you book your next holiday to Poland in 2025/2026.

  • 15°C maximum daytime temperature in September in Gdansk15
    15°C max day temperature
  • 5 hours of sunshine per day
  • 15 days with some rainfall in September in Gdansk15
    15 days with some rainfall
  • 8°C minimum night-time temperature in September in Gdansk8
    8°C min night temperature
  • 13 hours of daylight per day in September in Gdansk13
    13 hours of daylight per day
  • No heat & humidity in September in Gdansk0
    No heat & humidity
  • 53 mm monthly rainfall in September in Gdansk53
    53 mm of monthly rainfall
  • UV (maximum) index 3 (Moderate) in September in Gdansk3
    3 (Moderate) UV index
  • 16°C sea temperature in September in Gdansk16
    16°C sea temperature

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The September weather guide for Poland (Gdansk) 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 Poland

How warm is it in Gdansk in September?

Daytime temperatures usually reach 15°C in Gdansk in September, falling to 8°C at night.

How sunny is it in Gdansk in September?

There are normally 5 hours of bright sunshine each day in Gdansk in September - that's 37% of daylight hours.

How warm is the sea around Gdansk in September?

The average sea temperature around Gdansk in September is 16°C.

Does it rain in Gdansk in September?

There are usually 15 days with some rain in Gdansk in September and the average monthly rainfall is 53mm.

Gdansk September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 04:53 18:36
Monday, 15th September 2025 05:18 18:01
Tuesday, 30th September 2025 05:46 17:24

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