Thunder Bay weather live forecast

Today's maximum temperature in Thunder Bay is expected to be 1°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 18th 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 18th March 2026

Expect mostly cloudy with light snow in Thunder Bay, Ontario with a maximum temperature of 1°C, maximum UV of 1 (Low) and 2 hours of bright sunshine. There are 0-2 cm of snow expected with 56% chance of some snow and a gentle breeze of 13 kph from the south.

  • 1°C maximum temperature1
    °C maximum temperature
  • -10°C minimum temperature-10
    °C minimum temperature
  • Mostly cloudy with light snow
    mostly cloudy with light snow
  • 2 hours of bright sunshine2
    hours of sunshine
  • UV (maximum) index 1 (Low)1
    UV index (Low)
  • 56% chance of some snow56
    % chance of some snow
  • 0-2 cm of snow expected<2
    cm of snow expected
  • -2°C wind chill-2
    °C wind chill
  • Gentle breeze of 13 kph from the South13
    kph wind from S

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Thunder Bay weather for Thursday 19th March 2026

Expect clear skies with flurries of snow in Thunder Bay, Ontario with a maximum temperature of 2°C, maximum UV of 3 (Moderate) and 7 hours of bright sunshine. There are 0-2 cm of snow expected with 58% chance of some snow and a light breeze of 10 kph from the north-west.

  • 2°C maximum temperature2
    °C maximum temperature
  • -8°C minimum temperature-8
    °C minimum temperature
  • Clear skies with flurries of snow
    clear skies with flurries of snow
  • 7 hours of bright sunshine7
    hours of sunshine
  • UV (maximum) index 3 (Moderate)3
    UV index (Moderate)
  • 58% chance of some snow58
    % chance of some snow
  • 0-2 cm of snow expected<2
    cm of snow expected
  • -1°C wind chill-1
    °C wind chill
  • Light breeze of 10 kph from the North-West10
    kph wind from NW

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Thunder Bay weather for Friday 20th March 2026

Expect cloudy with sleet or snow in Thunder Bay, Ontario with a maximum temperature of 4°C, maximum UV of 4 (Moderate) and 3 hours of bright sunshine. There are 5-10 mm of sleet/snow expected with 30% chance of some sleet or snow and a light breeze of 9 kph from the north-east.

  • 4°C maximum temperature4
    °C maximum temperature
  • -3°C minimum temperature-3
    °C minimum temperature
  • Cloudy with sleet or snow
    cloudy with sleet or snow
  • 3 hours of bright sunshine3
    hours of sunshine
  • UV (maximum) index 4 (Moderate)4
    UV index (Moderate)
  • 30% chance of some sleet or snow30
    % chance of some sleet or snow
  • 5-10 mm of sleet/snow expected<10
    mm of sleet/snow expected
  • 1°C wind chill1
    °C wind chill
  • Light breeze of 9 kph from the North-East9
    kph wind from NE

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Thunder Bay weather for Saturday 21st March 2026

Expect cloudy with sleet or snow in Thunder Bay, Ontario with a maximum temperature of 3°C, maximum UV of 3 (Moderate) and no hours of bright sunshine. There are 10-20 mm of sleet/snow expected with 56% chance of some sleet or snow and a gentle breeze of 16 kph from the north.

  • 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
  • No hours of bright sunshine0
    hours of sunshine
  • UV (maximum) index 3 (Moderate)3
    UV index (Moderate)
  • 56% chance of some sleet or snow56
    % chance of some sleet or snow
  • 10-20 mm of sleet/snow expected<20
    mm of sleet/snow expected
  • -1°C wind chill-1
    °C wind chill
  • Gentle breeze of 16 kph from the North16
    kph wind from N

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Thunder Bay weather for Sunday 22nd March 2026

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of 0°C, maximum UV of 3 (Moderate) and 2 hours of bright sunshine. There are 0 cm of snow expected and a gentle breeze of 16 kph from the north.

  • 0°C maximum temperature0
    °C maximum temperature
  • -9°C minimum temperature-9
    °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 cm of snow expected0
    cm of snow expected
  • -5°C wind chill-5
    °C wind chill
  • Gentle breeze of 16 kph from the North16
    kph wind from N

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

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