Thunder Bay weather in July 2025

Expect 75°F daytime maximum temperatures in the shade with on average 10 hours of sunshine per day in Thunder Bay in July. Check more long-term weather averages for Thunder Bay in July before you book your next holiday to Ontario in 2025/2026.

  • 75°F maximum daytime temperature in July in Thunder Bay75
    75°F max day temperature
  • 10 hours of sunshine per day
  • 12 days with some rainfall in July in Thunder Bay12
    12 days with some rainfall
  • 52°F minimum night-time temperature in July in Thunder Bay52
    52°F min night temperature
  • 16 hours of daylight per day in July in Thunder Bay16
    16 hours of daylight per day
  • No heat & humidity in July in Thunder Bay0
    No heat & humidity
  • 3.2 inches monthly rainfall in July in Thunder Bay3.2
    3.2 inches of monthly rainfall
  • UV (maximum) index 7 (High) in July in Thunder Bay7
    7 (High) UV index
  • 45°F sea temperature in July in Thunder Bay45
    45°F sea temperature

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The July weather guide for Ontario (Thunder Bay) 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 Thunder Bay in July?

Daytime temperatures usually reach 75°F in Thunder Bay in July, falling to 52°F at night.

How sunny is it in Thunder Bay in July?

There are normally 10 hours of bright sunshine each day in Thunder Bay in July - that's 61% of daylight hours.

How warm is the sea around Thunder Bay in July?

The average sea temperature around Thunder Bay in July is 45°F.

Does it rain in Thunder Bay in July?

There are usually 12 days with some rain in Thunder Bay in July and the average monthly rainfall is 3.2 inches.

Thunder Bay July sunrise & sunset times

Browse the sunrise and sunset times for Thunder Bay in July 2025. Select a month to view Thunder Bay sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Tuesday, 1st July 2025 05:00 21:02
Wednesday, 16th July 2025 05:13 20:53
Thursday, 31st July 2025 05:31 20:35

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