Thunder Bay weather live forecast

Today's maximum temperature in Thunder Bay is expected to be 23°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 Friday 21st August 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 Friday 21st August 2026

Expect isolated thunderstorms in Thunder Bay, Ontario with a maximum temperature of 23°C, maximum UV of 3 (Moderate) and 4 hours of bright sunshine. There are 0-2 mm of rainfall expected with 25% chance of some rain and a light breeze of 8 kph from the north-east.

  • 23°C maximum temperature23
    °C maximum temperature
  • 13°C minimum temperature13
    °C minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • 4 hours of bright sunshine4
    hours of sunshine
  • UV (maximum) index 3 (Moderate)3
    UV index (Moderate)
  • 25% chance of some rain25
    % chance of some rain
  • 0-2 mm of rainfall expected<2
    mm of rainfall expected
  • 23°C wind chill23
    °C wind chill
  • Light breeze of 8 kph from the North-East8
    kph wind from NE

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Thunder Bay weather for Saturday 22nd August 2026

Expect sunshine and showers in Thunder Bay, Ontario with a maximum temperature of 22°C, maximum UV of 4 (Moderate) and 8 hours of bright sunshine. There are 0-2 mm of rainfall expected with 18% chance of some rain and a gentle breeze of 18 kph from the north.

  • 22°C maximum temperature22
    °C maximum temperature
  • 12°C minimum temperature12
    °C minimum temperature
  • Sunshine and showers
    sunshine and showers
  • 8 hours of bright sunshine8
    hours of sunshine
  • UV (maximum) index 4 (Moderate)4
    UV index (Moderate)
  • 18% chance of some rain18
    % chance of some rain
  • 0-2 mm of rainfall expected<2
    mm of rainfall expected
  • No heat & humidity0
    no heat & humidity
  • Gentle breeze of 18 kph from the North18
    kph wind from N

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Thunder Bay weather for Sunday 23rd August 2026

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of 22°C, maximum UV of 3 (Moderate) and 8 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 11 kph from the north.

  • 22°C maximum temperature22
    °C maximum temperature
  • 10°C minimum temperature10
    °C minimum temperature
  • Broken clouds
    broken clouds
  • 8 hours of bright sunshine8
    hours of sunshine
  • UV (maximum) index 3 (Moderate)3
    UV index (Moderate)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • 22°C wind chill22
    °C wind chill
  • Light breeze of 11 kph from the North11
    kph wind from N

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Thunder Bay weather for Monday 24th August 2026

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

  • 24°C maximum temperature24
    °C maximum temperature
  • 7°C minimum temperature7
    °C minimum temperature
  • Scattered clouds
    scattered clouds
  • 12 hours of bright sunshine12
    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 South12
    kph wind from S

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Thunder Bay weather for Tuesday 25th August 2026

Expect isolated thunderstorms in Thunder Bay, Ontario with a maximum temperature of 25°C, maximum UV of 5 (Moderate) and 2 hours of bright sunshine. There are 2-5 mm of rainfall expected with 64% chance of some rain and a gentle breeze of 14 kph from the south-east.

  • 25°C maximum temperature25
    °C maximum temperature
  • 11°C minimum temperature11
    °C minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • 2 hours of bright sunshine2
    hours of sunshine
  • UV (maximum) index 5 (Moderate)5
    UV index (Moderate)
  • 64% chance of some rain64
    % chance of some rain
  • 2-5 mm of rainfall expected<5
    mm of rainfall expected
  • No heat & humidity0
    no heat & humidity
  • Gentle breeze of 14 kph from the South-East14
    kph wind from SE

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