Hamilton weather in September 2025

Expect 70°F daytime maximum temperatures in the shade with on average 6 hours of sunshine per day in Hamilton in September. Check more long-term weather averages for Hamilton in September before you book your next holiday to Ontario in 2025/2026.

  • 70°F maximum daytime temperature in September in Hamilton70
    70°F max day temperature
  • 6 hours of sunshine per day
  • 10 days with some rainfall in September in Hamilton10
    10 days with some rainfall
  • 52°F minimum night-time temperature in September in Hamilton52
    52°F min night temperature
  • 12 hours of daylight per day in September in Hamilton12
    12 hours of daylight per day
  • No heat & humidity in September in Hamilton0
    No heat & humidity
  • 3.3 inches monthly rainfall in September in Hamilton3.3
    3.3 inches of monthly rainfall
  • UV (maximum) index 6 (High) in September in Hamilton6
    6 (High) UV index
  • 66°F sea temperature in September in Hamilton66
    66°F sea temperature

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The September weather guide for Ontario (Hamilton) 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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How hot is it in Hamilton in September?

Daytime temperatures usually reach 70°F in Hamilton in September, falling to 52°F at night.

How sunny is it in Hamilton in September?

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

How warm is the sea around Hamilton in September?

The average sea temperature around Hamilton in September is 66°F.

Does it rain in Hamilton in September?

There are usually 10 days with some rain in Hamilton in September and the average monthly rainfall is 3.3 inches.

Hamilton September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:44 18:54
Monday, 15th September 2025 05:59 18:29
Tuesday, 30th September 2025 06:16 18:02

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