Thunder Bay weather live forecast

Today's maximum temperature in Thunder Bay is expected to be 5°C. Select a day from the live weather forecast for Thunder Bay, Ontario, Canada for more weather parameters.

  • Tuesday
    12th May
    Mostly cloudy with rain (5-10 mm of rainfall expected)
  • Wednesday
    13th May
    Broken clouds
  • Thursday
    14th May
    Broken clouds
  • Friday
    15th May
    Mostly cloudy with rain (5-10 mm of rainfall expected)
  • Saturday
    16th May
    Broken clouds

5-day weather forecast updated at 04:00 on Tuesday 12th 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 12th May 2026

Expect mostly cloudy with rain in Thunder Bay, Ontario with a maximum temperature of 5°C, maximum UV of 2 (Low) and 1 hour of bright sunshine. There are 5-10 mm of rainfall expected with 93% chance of some rain and a gentle breeze of 18 kph from the east.

  • 5°C maximum temperature5
    °C maximum temperature
  • 0°C minimum temperature0
    °C minimum temperature
  • Mostly cloudy with rain
    mostly cloudy with rain
  • 1 hour of bright sunshine1
    hour of sunshine
  • UV (maximum) index 2 (Low)2
    UV index (Low)
  • 93% chance of some rain93
    % chance of some rain
  • 5-10 mm of rainfall expected<10
    mm of rainfall expected
  • 1°C wind chill1
    °C wind chill
  • Gentle breeze of 18 kph from the East18
    kph wind from E

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Thunder Bay weather for Wednesday 13th May 2026

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of 13°C, maximum UV of 3 (Moderate) and 7 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 15 kph from the north.

  • 13°C maximum temperature13
    °C maximum temperature
  • 1°C minimum temperature1
    °C minimum temperature
  • Broken clouds
    broken clouds
  • 7 hours of bright sunshine7
    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
  • Gentle breeze of 15 kph from the North15
    kph wind from N

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Thunder Bay weather for Thursday 14th May 2026

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of 12°C, maximum UV of 6 (High) and 5 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 14 kph from the south-east.

  • 12°C maximum temperature12
    °C maximum temperature
  • 2°C minimum temperature2
    °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
  • No heat & humidity0
    no heat & humidity
  • Gentle breeze of 14 kph from the South-East14
    kph wind from SE

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Thunder Bay weather for Friday 15th May 2026

Expect mostly cloudy with rain in Thunder Bay, Ontario with a maximum temperature of 18°C, maximum UV of 5 (Moderate) and 1 hour of bright sunshine. There are 5-10 mm of rainfall expected with 66% chance of some rain and a gentle breeze of 17 kph from the south.

  • 18°C maximum temperature18
    °C maximum temperature
  • 3°C minimum temperature3
    °C minimum temperature
  • Mostly cloudy with rain
    mostly cloudy with rain
  • 1 hour of bright sunshine1
    hour of sunshine
  • UV (maximum) index 5 (Moderate)5
    UV index (Moderate)
  • 66% chance of some rain66
    % chance of some rain
  • 5-10 mm of rainfall expected<10
    mm of rainfall expected
  • 18°C wind chill18
    °C wind chill
  • Gentle breeze of 17 kph from the South17
    kph wind from S

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Thunder Bay weather for Saturday 16th May 2026

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of 15°C, maximum UV of 3 (Moderate) and 2 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 20 kph from the west.

  • 15°C maximum temperature15
    °C maximum temperature
  • 7°C minimum temperature7
    °C minimum temperature
  • Broken clouds
    broken clouds
  • 2 hours of bright sunshine2
    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 20 kph from the West20
    kph wind from W

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