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.

  • Saturday
    9th May
    Mostly cloudy with light rain (0-2 mm of rainfall expected)
  • Sunday
    10th May
    Mostly cloudy with light rain (0-2 mm of rainfall expected)
  • Monday
    11th May
    Broken clouds
  • Tuesday
    12th May
    Mostly cloudy with light rain (2-5 mm of rainfall expected)
  • Wednesday
    13th May
    Broken clouds

5-day weather forecast updated at 04:00 on Saturday 9th 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 Saturday 9th May 2026

Expect mostly cloudy with light rain in Thunder Bay, Ontario with a maximum temperature of 9°C, maximum UV of 4 (Moderate) and 3 hours of bright sunshine. There are 0-2 mm of rainfall expected with 27% chance of some rain and a moderate breeze of 20 kph from the north-west.

  • 9°C maximum temperature9
    °C maximum temperature
  • 3°C minimum temperature3
    °C minimum temperature
  • Mostly cloudy with light rain
    mostly cloudy with light rain
  • 3 hours of bright sunshine3
    hours of sunshine
  • UV (maximum) index 4 (Moderate)4
    UV index (Moderate)
  • 27% chance of some rain27
    % chance of some rain
  • 0-2 mm of rainfall expected<2
    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 Sunday 10th May 2026

Expect mostly cloudy with light rain in Thunder Bay, Ontario with a maximum temperature of 8°C, maximum UV of 4 (Moderate) and 3 hours of bright sunshine. There are 0-2 mm of rainfall expected with 12% chance of some rain and a gentle breeze of 17 kph from the north-west.

  • 8°C maximum temperature8
    °C maximum temperature
  • 2°C minimum temperature2
    °C minimum temperature
  • Mostly cloudy with light rain
    mostly cloudy with light rain
  • 3 hours of bright sunshine3
    hours of sunshine
  • UV (maximum) index 4 (Moderate)4
    UV index (Moderate)
  • 12% chance of some rain12
    % chance of some rain
  • 0-2 mm of rainfall expected<2
    mm of rainfall expected
  • 5°C wind chill5
    °C wind chill
  • Gentle breeze of 17 kph from the North-West17
    kph wind from NW

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Thunder Bay weather for Monday 11th May 2026

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of 9°C, maximum UV of 3 (Moderate) and 9 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 15 kph from the south.

  • 9°C maximum temperature9
    °C maximum temperature
  • 0°C minimum temperature0
    °C minimum temperature
  • Broken clouds
    broken clouds
  • 9 hours of bright sunshine9
    hours of sunshine
  • UV (maximum) index 3 (Moderate)3
    UV index (Moderate)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • 7°C wind chill7
    °C wind chill
  • Gentle breeze of 15 kph from the South15
    kph wind from S

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Thunder Bay weather for Tuesday 12th May 2026

Expect mostly cloudy with light rain in Thunder Bay, Ontario with a maximum temperature of 7°C, maximum UV of 5 (Moderate) and 2 hours of bright sunshine. There are 2-5 mm of rainfall expected with 61% chance of some rain and a gentle breeze of 16 kph from the east.

  • 7°C maximum temperature7
    °C maximum temperature
  • 0°C minimum temperature0
    °C minimum temperature
  • Mostly cloudy with light rain
    mostly cloudy with light rain
  • 2 hours of bright sunshine2
    hours of sunshine
  • UV (maximum) index 5 (Moderate)5
    UV index (Moderate)
  • 61% chance of some rain61
    % chance of some rain
  • 2-5 mm of rainfall expected<5
    mm of rainfall expected
  • 4°C wind chill4
    °C wind chill
  • Gentle breeze of 16 kph from the East16
    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 14°C, maximum UV of 3 (Moderate) and 7 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 11 kph from the north-west.

  • 14°C maximum temperature14
    °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
  • Light breeze of 11 kph from the North-West11
    kph wind from NW

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