Hamilton weather in May 2025

Expect 66°F daytime maximum temperatures in the shade with on average 8 hours of sunshine per day in Hamilton in May. Check more long-term weather averages for Hamilton in May before you book your next holiday to Ontario in 2025/2026.

  • 66°F maximum daytime temperature in May in Hamilton66
    66°F max day temperature
  • 8 hours of sunshine per day
  • 11 days with some rainfall in May in Hamilton11
    11 days with some rainfall
  • 46°F minimum night-time temperature in May in Hamilton46
    46°F min night temperature
  • 15 hours of daylight per day in May in Hamilton15
    15 hours of daylight per day
  • No heat & humidity in May in Hamilton0
    No heat & humidity
  • 2.9 inches monthly rainfall in May in Hamilton2.9
    2.9 inches of monthly rainfall
  • UV (maximum) index 7 (High) in May in Hamilton7
    7 (High) UV index
  • 45°F sea temperature in May in Hamilton45
    45°F sea temperature

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The May 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 May?

Daytime temperatures usually reach 66°F in Hamilton in May, falling to 46°F at night.

How sunny is it in Hamilton in May?

There are normally 8 hours of bright sunshine each day in Hamilton in May - that's 52% of daylight hours.

How warm is the sea around Hamilton in May?

The average sea temperature around Hamilton in May is 45°F.

Does it rain in Hamilton in May?

There are usually 11 days with some rain in Hamilton in May and the average monthly rainfall is 2.9 inches.

Hamilton May sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Thursday, 1st May 2025 05:12 19:21
Friday, 16th May 2025 04:54 19:38
Saturday, 31st May 2025 04:43 19:52

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