Thunder Bay weather live forecast

Today's maximum temperature in Thunder Bay is expected to be 6°C. Select a day from the live weather forecast for Thunder Bay, Ontario, Canada for more weather parameters.

  • Sunday
    12th Apr
    Isolated thunderstorms (5-10 mm of rainfall expected)
  • Monday
    13th Apr
    Overcast skies
  • Tuesday
    14th Apr
    Mostly cloudy with light rain (2-5 mm of rainfall expected)
  • Wednesday
    15th Apr
    Fog in low lying areas
  • Thursday
    16th Apr
    Fog in low lying areas

5-day weather forecast updated at 04:00 on Sunday 12th 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 Sunday 12th April 2026

Expect isolated thunderstorms in Thunder Bay, Ontario with a maximum temperature of 6°C, maximum UV of 1 (Low) and 1 hour of bright sunshine. There are 5-10 mm of rainfall expected with 70% chance of some rain and a gentle breeze of 13 kph from the east.

  • 6°C maximum temperature6
    °C maximum temperature
  • 3°C minimum temperature3
    °C minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • 1 hour of bright sunshine1
    hour of sunshine
  • UV (maximum) index 1 (Low)1
    UV index (Low)
  • 70% chance of some rain70
    % chance of some rain
  • 5-10 mm of rainfall expected<10
    mm of rainfall expected
  • 3°C wind chill3
    °C wind chill
  • Gentle breeze of 13 kph from the East13
    kph wind from E

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Thunder Bay weather for Monday 13th April 2026

Expect overcast skies in Thunder Bay, Ontario with a maximum temperature of 7°C, maximum UV of 4 (Moderate) and 1 hour 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
  • 1°C minimum temperature1
    °C minimum temperature
  • Overcast skies
    overcast skies
  • 1 hour of bright sunshine1
    hour of sunshine
  • UV (maximum) index 4 (Moderate)4
    UV index (Moderate)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • 4°C wind chill4
    °C wind chill
  • Gentle breeze of 15 kph from the North-West15
    kph wind from NW

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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 no hours of bright sunshine. There are 2-5 mm of rainfall expected with 37% chance of some rain and a light breeze of 11 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
  • No hours of bright sunshine0
    hours of sunshine
  • UV (maximum) index 4 (Moderate)4
    UV index (Moderate)
  • 37% chance of some rain37
    % chance of some rain
  • 2-5 mm of rainfall expected<5
    mm of rainfall expected
  • 1°C wind chill1
    °C wind chill
  • Light breeze of 11 kph from the North-East11
    kph wind from NE

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Thunder Bay weather for Wednesday 15th April 2026

Expect fog in low lying areas in Thunder Bay, Ontario with a maximum temperature of 6°C, maximum UV of 4 (Moderate) and 3 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 7 kph from the east.

  • 6°C maximum temperature6
    °C maximum temperature
  • 0°C minimum temperature0
    °C minimum temperature
  • Fog in low lying areas
    fog in low lying areas
  • 3 hours of bright sunshine3
    hours of sunshine
  • UV (maximum) index 4 (Moderate)4
    UV index (Moderate)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • 4°C wind chill4
    °C wind chill
  • Light breeze of 7 kph from the East7
    kph wind from E

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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 4 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 12 kph from the north-east.

  • 11°C maximum temperature11
    °C maximum temperature
  • 0°C minimum temperature0
    °C minimum temperature
  • Fog in low lying areas
    fog in low lying areas
  • 4 hours of bright sunshine4
    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 12 kph from the North-East12
    kph wind from NE

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