Hamilton weather in September 2025

Expect 21°C 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.

  • 21°C maximum daytime temperature in September in Hamilton21
    21°C max day temperature
  • 6 hours of sunshine per day
  • 10 days with some rainfall in September in Hamilton10
    10 days with some rainfall
  • 11°C minimum night-time temperature in September in Hamilton11
    11°C 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
  • 84 mm monthly rainfall in September in Hamilton84
    84 mm of monthly rainfall
  • UV (maximum) index 6 (High) in September in Hamilton6
    6 (High) UV index
  • 19°C sea temperature in September in Hamilton19
    19°C 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 / mm)  |  Imperial (°F / inches)

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More about Ontario

How hot is it in Hamilton in September?

Daytime temperatures usually reach 21°C in Hamilton in September, falling to 11°C 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 19°C.

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 84mm.

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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