Koszalin weather in September 2025

Expect daytime maximum temperatures of 18°C in Koszalin in September based on long-term weather averages. There are 5 hours of sunshine per day on average with 15 days with some rainfall and typically 78 mm of rainfall in the month.

  • 18°C maximum daytime temperature in September in Koszalin18
    18°C max day temperature
  • 5 hours of sunshine per day
  • 15 days with some rainfall in September in Koszalin15
    15 days with some rainfall
  • 10°C minimum night-time temperature in September in Koszalin10
    10°C min night temperature
  • 13 hours of daylight per day in September in Koszalin13
    13 hours of daylight per day
  • No heat & humidity in September in Koszalin0
    No heat & humidity
  • 78 mm monthly rainfall in September in Koszalin78
    78 mm of monthly rainfall
  • UV (maximum) index 3 (Moderate) in September in Koszalin3
    3 (Moderate) UV index

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The September weather guide for Poland (Koszalin) 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 hot is it in Koszalin in September?

Daytime temperatures usually reach 18°C in Koszalin in September, falling to 10°C at night.

How sunny is it in Koszalin in September?

There are normally 5 hours of bright sunshine each day in Koszalin in September - that's 36% of daylight hours.

Does it rain in Koszalin in September?

There are usually 15 days with some rain in Koszalin in September and the average monthly rainfall is 78mm.

Koszalin September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:03 18:46
Monday, 15th September 2025 05:28 18:11
Tuesday, 30th September 2025 05:56 17:34

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