Thunder Bay weather live forecast

Today's maximum temperature in Thunder Bay is expected to be 11°C. Select a day from the live weather forecast for Thunder Bay, Ontario, Canada for more weather parameters.

5-day weather forecast updated at 04:00 on Monday 4th May 2026 GMT

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The 5-day weather forecast for Ontario (Thunder Bay) is provided by the Swiss meteorological agency, meteoblue. Find out more about our data sources.

Thunder Bay weather forecast by day

Below are the detailed weather forecasts for Thunder Bay for the next 5 days.

Thunder Bay weather for Monday 4th May 2026

Expect mostly cloudy with light rain in Thunder Bay, Ontario with a maximum temperature of 11°C, maximum UV of 3 (Moderate) and 3 hours of bright sunshine. There are 0-2 mm of rainfall expected with 43% chance of some rain and a fresh breeze of 30 kph from the west.

  • 11°C maximum temperature11
    °C maximum temperature
  • 3°C minimum temperature3
    °C minimum temperature
  • Mostly cloudy with light rain
    mostly cloudy with light rain
  • 3 hours of bright sunshine3
    hours of sunshine
  • UV (maximum) index 3 (Moderate)3
    UV index (Moderate)
  • 43% chance of some rain43
    % chance of some rain
  • 0-2 mm of rainfall expected<2
    mm of rainfall expected
  • No heat & humidity0
    no heat & humidity
  • Fresh breeze of 30 kph from the West30
    kph wind from W

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Thunder Bay weather for Tuesday 5th May 2026

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of 6°C, maximum UV of 3 (Moderate) and 2 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 22 kph from the north-west.

  • 6°C maximum temperature6
    °C maximum temperature
  • 0°C minimum temperature0
    °C minimum temperature
  • Broken clouds
    broken clouds
  • 2 hours of bright sunshine2
    hours of sunshine
  • UV (maximum) index 3 (Moderate)3
    UV index (Moderate)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • 2°C wind chill2
    °C wind chill
  • Moderate breeze of 22 kph from the North-West22
    kph wind from NW

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Thunder Bay weather for Wednesday 6th May 2026

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of 7°C, maximum UV of 2 (Low) and 2 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 15 kph from the north-west.

  • 7°C maximum temperature7
    °C maximum temperature
  • -2°C minimum temperature-2
    °C minimum temperature
  • Broken clouds
    broken clouds
  • 2 hours of bright sunshine2
    hours of sunshine
  • UV (maximum) index 2 (Low)2
    UV index (Low)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • 5°C wind chill5
    °C wind chill
  • Gentle breeze of 15 kph from the North-West15
    kph wind from NW

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Thunder Bay weather for Thursday 7th May 2026

Expect mostly cloudy with light rain in Thunder Bay, Ontario with a maximum temperature of 6°C, maximum UV of 3 (Moderate) and 2 hours of bright sunshine. There are 0-2 mm of rainfall expected with 35% chance of some rain and a light breeze of 11 kph from the west.

  • 6°C maximum temperature6
    °C maximum temperature
  • -1°C minimum temperature-1
    °C minimum temperature
  • Mostly cloudy with light rain
    mostly cloudy with light rain
  • 2 hours of bright sunshine2
    hours of sunshine
  • UV (maximum) index 3 (Moderate)3
    UV index (Moderate)
  • 35% chance of some rain35
    % chance of some rain
  • 0-2 mm of rainfall expected<2
    mm of rainfall expected
  • 4°C wind chill4
    °C wind chill
  • Light breeze of 11 kph from the West11
    kph wind from W

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Thunder Bay weather for Friday 8th May 2026

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of 10°C, maximum UV of 5 (Moderate) and 8 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 12 kph from the north-west.

  • 10°C maximum temperature10
    °C maximum temperature
  • -1°C minimum temperature-1
    °C minimum temperature
  • Broken clouds
    broken clouds
  • 8 hours of bright sunshine8
    hours of sunshine
  • UV (maximum) index 5 (Moderate)5
    UV index (Moderate)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • No heat & humidity0
    no heat & humidity
  • Light breeze of 12 kph from the North-West12
    kph wind from NW

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