Thunder Bay weather live forecast

Today's maximum temperature in Thunder Bay is expected to be 3°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 Wednesday 25th March 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 Wednesday 25th March 2026

Expect cloudy with sleet or snow in Thunder Bay, Ontario with a maximum temperature of 3°C, maximum UV of 2 (Low) and 2 hours of bright sunshine. There are 5-10 mm of sleet/snow expected with 100% chance of some sleet or snow and a gentle breeze of 13 kph from the east.

  • 3°C maximum temperature3
    °C maximum temperature
  • -4°C minimum temperature-4
    °C minimum temperature
  • Cloudy with sleet or snow
    cloudy with sleet or snow
  • 2 hours of bright sunshine2
    hours of sunshine
  • UV (maximum) index 2 (Low)2
    UV index (Low)
  • 100% chance of some sleet or snow100
    % chance of some sleet or snow
  • 5-10 mm of sleet/snow expected<10
    mm of sleet/snow expected
  • -1°C wind chill-1
    °C wind chill
  • Gentle breeze of 13 kph from the East13
    kph wind from E

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Thunder Bay weather for Thursday 26th March 2026

Expect clear skies with flurries of snow in Thunder Bay, Ontario with a maximum temperature of -3°C, maximum UV of 4 (Moderate) and 6 hours of bright sunshine. There are 0-2 cm of snow expected with 16% chance of some snow and a gentle breeze of 16 kph from the north.

  • -3°C maximum temperature-3
    °C maximum temperature
  • -9°C minimum temperature-9
    °C minimum temperature
  • Clear skies with flurries of snow
    clear skies with flurries of snow
  • 6 hours of bright sunshine6
    hours of sunshine
  • UV (maximum) index 4 (Moderate)4
    UV index (Moderate)
  • 16% chance of some snow16
    % chance of some snow
  • 0-2 cm of snow expected<2
    cm of snow expected
  • -9°C wind chill-9
    °C wind chill
  • Gentle breeze of 16 kph from the North16
    kph wind from N

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Thunder Bay weather for Friday 27th March 2026

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of -4°C, maximum UV of 3 (Moderate) and 3 hours of bright sunshine. There are 0 cm of snow expected and a moderate breeze of 20 kph from the west.

  • -4°C maximum temperature-4
    °C maximum temperature
  • -15°C minimum temperature-15
    °C minimum temperature
  • Broken clouds
    broken clouds
  • 3 hours of bright sunshine3
    hours of sunshine
  • UV (maximum) index 3 (Moderate)3
    UV index (Moderate)
  • 0 cm of snow expected0
    cm of snow expected
  • -10°C wind chill-10
    °C wind chill
  • Moderate breeze of 20 kph from the West20
    kph wind from W

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Thunder Bay weather for Saturday 28th March 2026

Expect scattered clouds in Thunder Bay, Ontario with a maximum temperature of -1°C, maximum UV of 3 (Moderate) and 11 hours of bright sunshine. There are 0 cm of snow expected and a gentle breeze of 15 kph from the west.

  • -1°C maximum temperature-1
    °C maximum temperature
  • -13°C minimum temperature-13
    °C minimum temperature
  • Scattered clouds
    scattered clouds
  • 11 hours of bright sunshine11
    hours of sunshine
  • UV (maximum) index 3 (Moderate)3
    UV index (Moderate)
  • 0 cm of snow expected0
    cm of snow expected
  • -6°C wind chill-6
    °C wind chill
  • Gentle breeze of 15 kph from the West15
    kph wind from W

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Thunder Bay weather for Sunday 29th March 2026

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of 4°C, maximum UV of 3 (Moderate) and 5 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 11 kph from the south-east.

  • 4°C maximum temperature4
    °C maximum temperature
  • -12°C minimum temperature-12
    °C minimum temperature
  • Broken clouds
    broken clouds
  • 5 hours of bright sunshine5
    hours of sunshine
  • UV (maximum) index 3 (Moderate)3
    UV index (Moderate)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • 1°C wind chill1
    °C wind chill
  • Light breeze of 11 kph from the South-East11
    kph wind from SE

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Metric (°C / mm)  |  Imperial (°F / inches)

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