Thunder Bay weather live forecast

Today's maximum temperature in Thunder Bay is expected to be 13°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 22nd 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 Friday 22nd May 2026

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of 13°C, maximum UV of 6 (High) and 9 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 19 kph from the east.

  • 13°C maximum temperature13
    °C maximum temperature
  • 1°C minimum temperature1
    °C minimum temperature
  • Broken clouds
    broken clouds
  • 9 hours of bright sunshine9
    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 19 kph from the East19
    kph wind from E

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Thunder Bay weather for Saturday 23rd May 2026

Expect mostly cloudy with rain in Thunder Bay, Ontario with a maximum temperature of 10°C, maximum UV of 2 (Low) and no hours of bright sunshine. There are 5-10 mm of rainfall expected with 88% chance of some rain and a gentle breeze of 15 kph from the east.

  • 10°C maximum temperature10
    °C maximum temperature
  • 5°C minimum temperature5
    °C minimum temperature
  • Mostly cloudy with rain
    mostly cloudy with rain
  • No hours of bright sunshine0
    hours of sunshine
  • UV (maximum) index 2 (Low)UV2
    UV index (Low)
  • 88% chance of some rain88
    % chance of some rain
  • 5-10 mm of rainfall expected<10
    mm of rainfall expected
  • 8°C wind chill8
    °C wind chill
  • Gentle breeze of 15 kph from the East15
    kph wind from E

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Thunder Bay weather for Sunday 24th May 2026

Expect sunshine and showers in Thunder Bay, Ontario with a maximum temperature of 17°C, maximum UV of 4 (Moderate) and 6 hours of bright sunshine. There are 0-2 mm of rainfall expected with 45% chance of some rain and a light breeze of 11 kph from the south-east.

  • 17°C maximum temperature17
    °C maximum temperature
  • 5°C minimum temperature5
    °C minimum temperature
  • Sunshine and showers
    sunshine and showers
  • 6 hours of bright sunshine6
    hours of sunshine
  • UV (maximum) index 4 (Moderate)UV4
    UV index (Moderate)
  • 45% chance of some rain45
    % chance of some rain
  • 0-2 mm of rainfall expected<2
    mm of rainfall expected
  • No heat & humidity0
    no heat & humidity
  • Light breeze of 11 kph from the South-East11
    kph wind from SE

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Thunder Bay weather for Monday 25th May 2026

Expect sunshine and showers in Thunder Bay, Ontario with a maximum temperature of 21°C, maximum UV of 6 (High) and 9 hours of bright sunshine. There are 0-2 mm of rainfall expected with 18% chance of some rain and a light breeze of 11 kph from the south.

  • 21°C maximum temperature21
    °C maximum temperature
  • 5°C minimum temperature5
    °C minimum temperature
  • Sunshine and showers
    sunshine and showers
  • 9 hours of bright sunshine9
    hours of sunshine
  • UV (maximum) index 6 (High)UV6
    UV index (High)
  • 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
  • Light breeze of 11 kph from the South11
    kph wind from S

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Thunder Bay weather for Tuesday 26th May 2026

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of 23°C, maximum UV of 6 (High) and 9 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 11 kph from the east.

  • 23°C maximum temperature23
    °C maximum temperature
  • 7°C minimum temperature7
    °C minimum temperature
  • Broken clouds
    broken clouds
  • 9 hours of bright sunshine9
    hours of sunshine
  • UV (maximum) index 6 (High)UV6
    UV index (High)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • 23°C wind chill23
    °C wind chill
  • Light breeze of 11 kph from the East11
    kph wind from E

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