Thunder Bay weather live forecast

Today's maximum temperature in Thunder Bay is expected to be 20°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 9th September 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 9th September 2026

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of 20°C, maximum UV of 3 (Moderate) and 4 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 28 kph from the west.

  • 20°C maximum temperature20
    °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 3 (Moderate)3
    UV index (Moderate)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • No heat & humidity0
    no heat & humidity
  • Moderate breeze of 28 kph from the West28
    kph wind from W

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Thunder Bay weather for Thursday 10th September 2026

Expect scattered clouds in Thunder Bay, Ontario with a maximum temperature of 21°C, maximum UV of 4 (Moderate) and 9 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 14 kph from the south.

  • 21°C maximum temperature21
    °C maximum temperature
  • 8°C minimum temperature8
    °C minimum temperature
  • Scattered clouds
    scattered clouds
  • 9 hours of bright sunshine9
    hours of sunshine
  • UV (maximum) index 4 (Moderate)4
    UV index (Moderate)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • 21°C wind chill21
    °C wind chill
  • Gentle breeze of 14 kph from the South14
    kph wind from S

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Thunder Bay weather for Friday 11th September 2026

Expect isolated thunderstorms in Thunder Bay, Ontario with a maximum temperature of 25°C, maximum UV of 5 (Moderate) and 10 hours of bright sunshine. There are 0-2 mm of rainfall expected with 65% chance of some rain and a moderate breeze of 23 kph from the south.

  • 25°C maximum temperature25
    °C maximum temperature
  • 13°C minimum temperature13
    °C minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • 10 hours of bright sunshine10
    hours of sunshine
  • UV (maximum) index 5 (Moderate)5
    UV index (Moderate)
  • 65% chance of some rain65
    % chance of some rain
  • 0-2 mm of rainfall expected<2
    mm of rainfall expected
  • 25°C wind chill25
    °C wind chill
  • Moderate breeze of 23 kph from the South23
    kph wind from S

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Thunder Bay weather for Saturday 12th September 2026

Expect isolated thunderstorms in Thunder Bay, Ontario with a maximum temperature of 22°C, maximum UV of 4 (Moderate) and 5 hours of bright sunshine. There are 10-20 mm of rainfall expected with 48% chance of some rain and a moderate breeze of 21 kph from the west.

  • 22°C maximum temperature22
    °C maximum temperature
  • 13°C minimum temperature13
    °C minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • 5 hours of bright sunshine5
    hours of sunshine
  • UV (maximum) index 4 (Moderate)4
    UV index (Moderate)
  • 48% chance of some rain48
    % chance of some rain
  • 10-20 mm of rainfall expected<20
    mm of rainfall expected
  • 22°C wind chill22
    °C wind chill
  • Moderate breeze of 21 kph from the West21
    kph wind from W

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Thunder Bay weather for Sunday 13th September 2026

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of 18°C, maximum UV of 5 (Moderate) and 5 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 15 kph from the west.

  • 18°C maximum temperature18
    °C maximum temperature
  • 8°C minimum temperature8
    °C minimum temperature
  • Broken clouds
    broken clouds
  • 5 hours of bright sunshine5
    hours of sunshine
  • UV (maximum) index 5 (Moderate)5
    UV index (Moderate)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • 18°C wind chill18
    °C wind chill
  • Gentle breeze of 15 kph from the West15
    kph wind from W

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