Thunder Bay weather in April 2025

Expect 46°F daytime maximum temperatures in the shade with on average 7 hours of sunshine per day in Thunder Bay in April. Check more long-term weather averages for Thunder Bay in April before you book your next holiday to Ontario in 2025/2026.

  • 46°F maximum daytime temperature in April in Thunder Bay46
    46°F max day temperature
  • 7 hours of sunshine per day
  • 9 days with some rainfall in April in Thunder Bay9
    9 days with some rainfall
  • 27°F minimum night-time temperature in April in Thunder Bay27
    27°F min night temperature
  • 14 hours of daylight per day in April in Thunder Bay14
    14 hours of daylight per day
  • No heat & humidity in April in Thunder Bay0
    No heat & humidity
  • 1.8 inches monthly rainfall in April in Thunder Bay1.8
    1.8 inches of monthly rainfall
  • UV (maximum) index 4 (Moderate) in April in Thunder Bay4
    4 (Moderate) UV index
  • 36°F sea temperature in April in Thunder Bay36
    36°F sea temperature

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The April 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 warm is it in Thunder Bay in April?

Daytime temperatures usually reach 46°F in Thunder Bay in April, falling to 27°F at night.

How sunny is it in Thunder Bay in April?

There are normally 7 hours of bright sunshine each day in Thunder Bay in April - that's 54% of daylight hours.

How warm is the sea around Thunder Bay in April?

The average sea temperature around Thunder Bay in April is 36°F.

Does it rain in Thunder Bay in April?

There are usually 9 days with some rain in Thunder Bay in April and the average monthly rainfall is 1.8 inches. Rain may fall as snow in this month.

Thunder Bay April sunrise & sunset times

Browse the sunrise and sunset times for Thunder Bay in April 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 April 2025 06:34 19:28
Tuesday, 15th April 2025 06:06 19:49
Wednesday, 30th April 2025 05:39 20:10

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