Kingston weather in September 2025

Expect 20°C daytime maximum temperatures in the shade with on average 6 hours of sunshine per day in Kingston in September. Check more long-term weather averages for Kingston in September before you book your next holiday to Ontario in 2025/2026.

  • 20°C maximum daytime temperature in September in Kingston20
    20°C max day temperature
  • 6 hours of sunshine per day
  • 11 days with some rainfall in September in Kingston11
    11 days with some rainfall
  • 11°C minimum night-time temperature in September in Kingston11
    11°C min night temperature
  • 12 hours of daylight per day in September in Kingston12
    12 hours of daylight per day
  • No heat & humidity in September in Kingston0
    No heat & humidity
  • 92 mm monthly rainfall in September in Kingston92
    92 mm of monthly rainfall
  • UV (maximum) index 5 (Moderate) in September in Kingston5
    5 (Moderate) UV index
  • 19°C sea temperature in September in Kingston19
    19°C sea temperature

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The September weather guide for Ontario (Kingston) 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 Kingston in September?

Daytime temperatures usually reach 20°C in Kingston in September, falling to 11°C at night.

How sunny is it in Kingston in September?

There are normally 6 hours of bright sunshine each day in Kingston in September - that's 46% of daylight hours.

How warm is the sea around Kingston in September?

The average sea temperature around Kingston in September is 19°C.

Does it rain in Kingston in September?

There are usually 11 days with some rain in Kingston in September and the average monthly rainfall is 92mm.

Kingston September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:29 18:42
Monday, 15th September 2025 05:45 18:16
Tuesday, 30th September 2025 06:03 17:48

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