Thunder Bay weather live forecast

Today's maximum temperature in Thunder Bay is expected to be 4°C. Select a day from the live weather forecast for Thunder Bay, Ontario, Canada for more weather parameters.

  • Tuesday
    14th Apr
    Mostly cloudy with light rain (2-5 mm of rainfall expected)
  • Wednesday
    15th Apr
    Broken clouds
  • Thursday
    16th Apr
    Fog in low lying areas
  • Friday
    17th Apr
    Isolated thunderstorms (2-5 mm of rainfall expected)
  • Saturday
    18th Apr
    Cloudy with sleet or snow (5-10 mm of rainfall expected)

5-day weather forecast updated at 04:00 on Tuesday 14th April 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 Tuesday 14th April 2026

Expect mostly cloudy with light rain in Thunder Bay, Ontario with a maximum temperature of 4°C, maximum UV of 4 (Moderate) and 1 hour of bright sunshine. There are 2-5 mm of rainfall expected with 83% chance of some rain and a light breeze of 9 kph from the north-east.

  • 4°C maximum temperature4
    °C maximum temperature
  • 0°C minimum temperature0
    °C minimum temperature
  • Mostly cloudy with light rain
    mostly cloudy with light rain
  • 1 hour of bright sunshine1
    hour of sunshine
  • UV (maximum) index 4 (Moderate)4
    UV index (Moderate)
  • 83% chance of some rain83
    % chance of some rain
  • 2-5 mm of rainfall expected<5
    mm of rainfall expected
  • 2°C wind chill2
    °C wind chill
  • Light breeze of 9 kph from the North-East9
    kph wind from NE

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Thunder Bay weather for Wednesday 15th April 2026

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of 6°C, maximum UV of 5 (Moderate) and 3 hours of bright sunshine. There are 0 mm of rainfall expected and little or no wind of 6 kph from the south-east.

  • 6°C maximum temperature6
    °C maximum temperature
  • 0°C minimum temperature0
    °C minimum temperature
  • Broken clouds
    broken clouds
  • 3 hours of bright sunshine3
    hours of sunshine
  • UV (maximum) index 5 (Moderate)5
    UV index (Moderate)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • 5°C wind chill5
    °C wind chill
  • Little or no wind of 6 kph from the South-East6
    kph wind from SE

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Thunder Bay weather for Thursday 16th April 2026

Expect fog in low lying areas in Thunder Bay, Ontario with a maximum temperature of 11°C, maximum UV of 5 (Moderate) and 7 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 11 kph from the east.

  • 11°C maximum temperature11
    °C maximum temperature
  • 1°C minimum temperature1
    °C minimum temperature
  • Fog in low lying areas
    fog in low lying areas
  • 7 hours of bright sunshine7
    hours of sunshine
  • UV (maximum) index 5 (Moderate)5
    UV index (Moderate)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • 11°C wind chill11
    °C wind chill
  • Light breeze of 11 kph from the East11
    kph wind from E

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Thunder Bay weather for Friday 17th April 2026

Expect isolated thunderstorms in Thunder Bay, Ontario with a maximum temperature of 6°C, maximum UV of 3 (Moderate) and 1 hour of bright sunshine. There are 2-5 mm of rainfall expected with 83% chance of some rain and a gentle breeze of 17 kph from the east.

  • 6°C maximum temperature6
    °C maximum temperature
  • -1°C minimum temperature-1
    °C minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • 1 hour of bright sunshine1
    hour of sunshine
  • UV (maximum) index 3 (Moderate)3
    UV index (Moderate)
  • 83% chance of some rain83
    % chance of some rain
  • 2-5 mm of rainfall expected<5
    mm of rainfall expected
  • 3°C wind chill3
    °C wind chill
  • Gentle breeze of 17 kph from the East17
    kph wind from E

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Thunder Bay weather for Saturday 18th April 2026

Expect cloudy with sleet or snow in Thunder Bay, Ontario with a maximum temperature of 6°C, maximum UV of 1 (Low) and no hours of bright sunshine. There are 5-10 mm of sleet/snow expected with 71% chance of some sleet or snow and a moderate breeze of 25 kph from the north-west.

  • 6°C maximum temperature6
    °C maximum temperature
  • -2°C minimum temperature-2
    °C minimum temperature
  • Cloudy with sleet or snow
    cloudy with sleet or snow
  • No hours of bright sunshine0
    hours of sunshine
  • UV (maximum) index 1 (Low)1
    UV index (Low)
  • 71% chance of some sleet or snow71
    % 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
  • Moderate breeze of 25 kph from the North-West25
    kph wind from NW

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