Windsor weather in September 2025

Expect daytime maximum temperatures of 23°C in Windsor in September based on long-term weather averages. There are 6 hours of sunshine per day on average with 11 days with some rainfall and typically 84 mm of rainfall in the month.

  • 23°C maximum daytime temperature in September in Windsor23
    23°C max day temperature
  • 6 hours of sunshine per day
  • 11 days with some rainfall in September in Windsor11
    11 days with some rainfall
  • 12°C minimum night-time temperature in September in Windsor12
    12°C min night temperature
  • 12 hours of daylight per day in September in Windsor12
    12 hours of daylight per day
  • No heat & humidity in September in Windsor0
    No heat & humidity
  • 84 mm monthly rainfall in September in Windsor84
    84 mm of monthly rainfall
  • UV (maximum) index 6 (High) in September in Windsor6
    6 (High) UV index
  • 20°C sea temperature in September in Windsor20
    20°C sea temperature

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The September weather guide for Ontario (Windsor) 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 Ontario

How hot is it in Windsor in September?

Daytime temperatures usually reach 23°C in Windsor in September, falling to 12°C at night.

How sunny is it in Windsor in September?

There are normally 6 hours of bright sunshine each day in Windsor in September - that's 51% of daylight hours.

How warm is the sea around Windsor in September?

The average sea temperature around Windsor in September is 20°C.

Does it rain in Windsor in September?

There are usually 11 days with some rain in Windsor in September and the average monthly rainfall is 84mm.

Windsor September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:57 19:05
Monday, 15th September 2025 06:12 18:41
Tuesday, 30th September 2025 06:28 18:14

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