Thunder Bay weather live forecast

Today's maximum temperature in Thunder Bay is expected to be 9°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 Tuesday 19th May 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 Tuesday 19th May 2026

Expect mostly cloudy with rain in Thunder Bay, Ontario with a maximum temperature of 9°C, maximum UV of 4 (Moderate) and 2 hours of bright sunshine. There are 10-20 mm of rainfall expected with 19% chance of some rain and a moderate breeze of 20 kph from the north-west.

  • 9°C maximum temperature9
    °C maximum temperature
  • 2°C minimum temperature2
    °C minimum temperature
  • Mostly cloudy with rain
    mostly cloudy with rain
  • 2 hours of bright sunshine2
    hours of sunshine
  • UV (maximum) index 4 (Moderate)UV4
    UV index (Moderate)
  • 19% chance of some rain19
    % chance of some rain
  • 10-20 mm of rainfall expected<20
    mm of rainfall expected
  • 6°C wind chill6
    °C wind chill
  • Moderate breeze of 20 kph from the North-West20
    kph wind from NW

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Thunder Bay weather for Wednesday 20th May 2026

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of 12°C, maximum UV of 4 (Moderate) and 8 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 15 kph from the north-west.

  • 12°C maximum temperature12
    °C maximum temperature
  • 0°C minimum temperature0
    °C minimum temperature
  • Broken clouds
    broken clouds
  • 8 hours of bright sunshine8
    hours of sunshine
  • UV (maximum) index 4 (Moderate)UV4
    UV index (Moderate)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • No heat & humidity0
    no heat & humidity
  • Gentle breeze of 15 kph from the North-West15
    kph wind from NW

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Thunder Bay weather for Thursday 21st May 2026

Expect scattered clouds in Thunder Bay, Ontario with a maximum temperature of 14°C, maximum UV of 6 (High) and 12 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 17 kph from the south.

  • 14°C maximum temperature14
    °C maximum temperature
  • 1°C minimum temperature1
    °C minimum temperature
  • Scattered clouds
    scattered clouds
  • 12 hours of bright sunshine12
    hours of sunshine
  • UV (maximum) index 6 (High)UV6
    UV index (High)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • No heat & humidity0
    no heat & humidity
  • Gentle breeze of 17 kph from the South17
    kph wind from S

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Thunder Bay weather for Friday 22nd May 2026

Expect scattered clouds in Thunder Bay, Ontario with a maximum temperature of 13°C, maximum UV of 6 (High) and 13 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 17 kph from the east.

  • 13°C maximum temperature13
    °C maximum temperature
  • 2°C minimum temperature2
    °C minimum temperature
  • Scattered clouds
    scattered clouds
  • 13 hours of bright sunshine13
    hours of sunshine
  • UV (maximum) index 6 (High)UV6
    UV index (High)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • 13°C wind chill13
    °C wind chill
  • Gentle breeze of 17 kph from the East17
    kph wind from E

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Thunder Bay weather for Saturday 23rd May 2026

Expect mostly cloudy with light rain in Thunder Bay, Ontario with a maximum temperature of 14°C, maximum UV of 3 (Moderate) and no 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 east.

  • 14°C maximum temperature14
    °C maximum temperature
  • 4°C minimum temperature4
    °C minimum temperature
  • Mostly cloudy with light rain
    mostly cloudy with light rain
  • No hours of bright sunshine0
    hours of sunshine
  • UV (maximum) index 3 (Moderate)UV3
    UV index (Moderate)
  • 33% chance of some rain33
    % chance of some rain
  • 0-2 mm of rainfall expected<2
    mm of rainfall expected
  • 14°C wind chill14
    °C wind chill
  • Gentle breeze of 14 kph from the East14
    kph wind from E

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