Windsor weather in September 2025

Expect 73°F daytime maximum temperatures in the shade with on average 6 hours of sunshine per day in Windsor in September. Check more long-term weather averages for Windsor in September before you book your next holiday to Ontario in 2025/2026.

  • 73°F maximum daytime temperature in September in Windsor73
    73°F max day temperature
  • 6 hours of sunshine per day
  • 11 days with some rainfall in September in Windsor11
    11 days with some rainfall
  • 54°F minimum night-time temperature in September in Windsor54
    54°F 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
  • 3.3 inches monthly rainfall in September in Windsor3.3
    3.3 inches of monthly rainfall
  • UV (maximum) index 6 (High) in September in Windsor6
    6 (High) UV index
  • 68°F sea temperature in September in Windsor68
    68°F 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)  |  Imperial (°F)

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More about Canada

How hot is it in Windsor in September?

Daytime temperatures usually reach 73°F in Windsor in September, falling to 54°F 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 68°F.

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 3.3 inches.

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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