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

More about Hamilton

Hamilton by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Recommended for Ontario

Travelbag: Latest holiday sale offers worldwide

  • Explore latest sale offers on holidays in 2024/2025
  • Filter deals by continent, star rating & holiday type
  • Including Dubai, Caribbean, North America, Asia & Pacific
Go to Travelbag deal >>

View all Travelbag offers

TravelbagHoliday deal finder

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)

Back to top

More about Canada

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

Related posts

Popular travel offers

Explore holidays in the sun for less

More holidays

Airport parking

More parking

Airport lounges

More lounges

Top ^