Thunder Bay weather live forecast

Today's maximum temperature in Thunder Bay is expected to be 14°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 Thursday 21st 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 Thursday 21st May 2026

Expect scattered clouds in Thunder Bay, Ontario with a maximum temperature of 14°C, maximum UV of 6 (High) and 13 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 15 kph from the south-east.

  • 14°C maximum temperature14
    °C maximum temperature
  • 0°C minimum temperature0
    °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
  • No heat & humidity0
    no heat & humidity
  • Gentle breeze of 15 kph from the South-East15
    kph wind from SE

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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 12 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 18 kph from the east.

  • 13°C maximum temperature13
    °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 18 kph from the East18
    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 1 (Low) and no hours of bright sunshine. There are 5-10 mm of rainfall expected with 59% 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 1 (Low)UV1
    UV index (Low)
  • 59% chance of some rain59
    % chance of some rain
  • 5-10 mm of rainfall expected<10
    mm of rainfall expected
  • No heat & humidity0
    no heat & humidity
  • 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 mostly cloudy with light rain in Thunder Bay, Ontario with a maximum temperature of 19°C, maximum UV of 4 (Moderate) and 1 hour of bright sunshine. There are 2-5 mm of rainfall expected with 32% chance of some rain and a light breeze of 9 kph from the south.

  • 19°C maximum temperature19
    °C maximum temperature
  • 5°C minimum temperature5
    °C minimum temperature
  • Mostly cloudy with light rain
    mostly cloudy with light rain
  • 1 hour of bright sunshine1
    hour of sunshine
  • UV (maximum) index 4 (Moderate)UV4
    UV index (Moderate)
  • 32% chance of some rain32
    % chance of some rain
  • 2-5 mm of rainfall expected<5
    mm of rainfall expected
  • 19°C wind chill19
    °C wind chill
  • Light breeze of 9 kph from the South9
    kph wind from S

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Thunder Bay weather for Monday 25th May 2026

Expect scattered clouds in Thunder Bay, Ontario with a maximum temperature of 23°C, maximum UV of 6 (High) and 12 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 14 kph from the south-east.

  • 23°C maximum temperature23
    °C maximum temperature
  • 6°C minimum temperature6
    °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 14 kph from the South-East14
    kph wind from SE

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