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 Sunday 6th 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 Monday 7th September 2026

Expect mostly cloudy with light rain in Thunder Bay, Ontario with a maximum temperature of 20°C, maximum UV of 4 (Moderate) and 4 hours of bright sunshine. There are 2-5 mm of rainfall expected with 43% chance of some rain and a gentle breeze of 17 kph from the east.

  • 20°C maximum temperature20
    °C maximum temperature
  • 14°C minimum temperature14
    °C minimum temperature
  • Mostly cloudy with light rain
    mostly cloudy with light rain
  • 4 hours of bright sunshine4
    hours of sunshine
  • UV (maximum) index 4 (Moderate)4
    UV index (Moderate)
  • 43% chance of some rain43
    % chance of some rain
  • 2-5 mm of rainfall expected<5
    mm of rainfall expected
  • 20°C wind chill20
    °C wind chill
  • Gentle breeze of 17 kph from the East17
    kph wind from E

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Thunder Bay weather for Tuesday 8th September 2026

Expect isolated thunderstorms in Thunder Bay, Ontario with a maximum temperature of 23°C, maximum UV of 6 (High) and 1 hour of bright sunshine. There are 20-30 mm of rainfall expected with 74% chance of some rain and a moderate breeze of 20 kph from the south.

  • 23°C maximum temperature23
    °C maximum temperature
  • 15°C minimum temperature15
    °C minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • 1 hour of bright sunshine1
    hour of sunshine
  • UV (maximum) index 6 (High)6
    UV index (High)
  • 74% chance of some rain74
    % chance of some rain
  • 20-30 mm of rainfall expected<30
    mm of rainfall expected
  • 23°C wind chill23
    °C wind chill
  • Moderate breeze of 20 kph from the South20
    kph wind from S

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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 3 hours of bright sunshine. There are 0 mm of rainfall expected and a fresh breeze of 30 kph from the west.

  • 20°C maximum temperature20
    °C maximum temperature
  • 13°C minimum temperature13
    °C minimum temperature
  • Broken clouds
    broken clouds
  • 3 hours of bright sunshine3
    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
  • Fresh breeze of 30 kph from the West30
    kph wind from W

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Thunder Bay weather for Thursday 10th September 2026

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of 20°C, maximum UV of 6 (High) and 1 hour of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 20 kph from the north-west.

  • 20°C maximum temperature20
    °C maximum temperature
  • 10°C minimum temperature10
    °C minimum temperature
  • Broken clouds
    broken clouds
  • 1 hour of bright sunshine1
    hour of sunshine
  • UV (maximum) index 6 (High)6
    UV index (High)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • 20°C wind chill20
    °C wind chill
  • Moderate breeze of 20 kph from the North-West20
    kph wind from NW

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Thunder Bay weather for Friday 11th September 2026

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of 23°C, maximum UV of 6 (High) and 5 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 20 kph from the south.

  • 23°C maximum temperature23
    °C maximum temperature
  • 10°C minimum temperature10
    °C minimum temperature
  • Broken clouds
    broken clouds
  • 5 hours of bright sunshine5
    hours of sunshine
  • UV (maximum) index 6 (High)6
    UV index (High)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • 23°C wind chill23
    °C wind chill
  • Moderate breeze of 20 kph from the South20
    kph wind from S

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