Thunder Bay weather live forecast

Today's maximum temperature in Thunder Bay is expected to be 27°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 Thursday 9th July 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 Thursday 9th July 2026

Expect scattered clouds in Thunder Bay, Ontario with a maximum temperature of 27°C, low levels of heat & humidity, maximum UV of 6 (High) and 10 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 8 kph from the north-west.

  • 27°C maximum temperature27
    °C maximum temperature
  • 13°C minimum temperature13
    °C minimum temperature
  • Scattered clouds
    scattered clouds
  • 10 hours of bright sunshine10
    hours of sunshine
  • UV (maximum) index 6 (High)6
    UV index (High)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • Low heat & humidityL
    low heat & humidity
  • Light breeze of 8 kph from the North-West8
    kph wind from NW

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Thunder Bay weather for Friday 10th July 2026

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of 24°C, maximum UV of 6 (High) and 4 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 12 kph from the south-east.

  • 24°C maximum temperature24
    °C maximum temperature
  • 13°C minimum temperature13
    °C minimum temperature
  • Broken clouds
    broken clouds
  • 4 hours of bright sunshine4
    hours of sunshine
  • UV (maximum) index 6 (High)6
    UV index (High)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • 24°C wind chill24
    °C wind chill
  • Light breeze of 12 kph from the South-East12
    kph wind from SE

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Thunder Bay weather for Saturday 11th July 2026

Expect scattered clouds in Thunder Bay, Ontario with a maximum temperature of 25°C, maximum UV of 7 (High) and 11 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 11 kph from the south-east.

  • 25°C maximum temperature25
    °C maximum temperature
  • 11°C minimum temperature11
    °C minimum temperature
  • Scattered clouds
    scattered clouds
  • 11 hours of bright sunshine11
    hours of sunshine
  • UV (maximum) index 7 (High)7
    UV index (High)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • 25°C wind chill25
    °C wind chill
  • Light breeze of 11 kph from the South-East11
    kph wind from SE

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Thunder Bay weather for Sunday 12th July 2026

Expect isolated thunderstorms in Thunder Bay, Ontario with a maximum temperature of 30°C, moderate levels of heat & humidity, maximum UV of 7 (High) and 10 hours of bright sunshine. There are 0-2 mm of rainfall expected with 33% chance of some rain and a gentle breeze of 14 kph from the south.

  • 30°C maximum temperature30
    °C maximum temperature
  • 12°C minimum temperature12
    °C minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • 10 hours of bright sunshine10
    hours of sunshine
  • UV (maximum) index 7 (High)7
    UV index (High)
  • 33% chance of some rain33
    % chance of some rain
  • 0-2 mm of rainfall expected<2
    mm of rainfall expected
  • Moderate heat & humidityM
    moderate heat & humidity
  • Gentle breeze of 14 kph from the South14
    kph wind from S

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Thunder Bay weather for Monday 13th July 2026

Expect scattered clouds in Thunder Bay, Ontario with a maximum temperature of 34°C, high levels of heat & humidity, maximum UV of 7 (High) and 12 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 20 kph from the south-west.

  • 34°C maximum temperature34
    °C maximum temperature
  • 18°C minimum temperature18
    °C minimum temperature
  • Scattered clouds
    scattered clouds
  • 12 hours of bright sunshine12
    hours of sunshine
  • UV (maximum) index 7 (High)7
    UV index (High)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • High heat & humidityH
    high heat & humidity
  • Moderate breeze of 20 kph from the South-West20
    kph wind from SW

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