Thunder Bay weather live forecast

Today's maximum temperature in Thunder Bay is expected to be 18°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 Sunday 21st June 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 Sunday 21st June 2026

Expect sunshine and showers in Thunder Bay, Ontario with a maximum temperature of 18°C, maximum UV of 4 (Moderate) and 7 hours of bright sunshine. There are 2-5 mm of rainfall expected with 77% chance of some rain and a light breeze of 8 kph from the north-west.

  • 18°C maximum temperature18
    °C maximum temperature
  • 9°C minimum temperature9
    °C minimum temperature
  • Sunshine and showers
    sunshine and showers
  • 7 hours of bright sunshine7
    hours of sunshine
  • UV (maximum) index 4 (Moderate)4
    UV index (Moderate)
  • 77% chance of some rain77
    % chance of some rain
  • 2-5 mm of rainfall expected<5
    mm of rainfall expected
  • No heat & humidity0
    no heat & humidity
  • Light breeze of 8 kph from the North-West8
    kph wind from NW

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Thunder Bay weather for Monday 22nd June 2026

Expect scattered clouds in Thunder Bay, Ontario with a maximum temperature of 21°C, maximum UV of 6 (High) and 10 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 12 kph from the north-west.

  • 21°C maximum temperature21
    °C maximum temperature
  • 8°C minimum temperature8
    °C minimum temperature
  • Scattered clouds
    scattered clouds
  • 10 hours of bright sunshine10
    hours of sunshine
  • UV (maximum) index 6 (High)6
    UV index (High)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • 21°C wind chill21
    °C wind chill
  • Light breeze of 12 kph from the North-West12
    kph wind from NW

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Thunder Bay weather for Tuesday 23rd June 2026

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of 20°C, maximum UV of 4 (Moderate) and 5 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 11 kph from the south-east.

  • 20°C maximum temperature20
    °C maximum temperature
  • 10°C minimum temperature10
    °C minimum temperature
  • Broken clouds
    broken clouds
  • 5 hours of bright sunshine5
    hours of sunshine
  • UV (maximum) index 4 (Moderate)4
    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 South-East11
    kph wind from SE

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Thunder Bay weather for Wednesday 24th June 2026

Expect mostly cloudy with rain in Thunder Bay, Ontario with a maximum temperature of 17°C, maximum UV of 5 (Moderate) and 3 hours of bright sunshine. There are 10-20 mm of rainfall expected with 48% chance of some rain and a light breeze of 12 kph from the east.

  • 17°C maximum temperature17
    °C maximum temperature
  • 10°C minimum temperature10
    °C minimum temperature
  • Mostly cloudy with rain
    mostly cloudy with rain
  • 3 hours of bright sunshine3
    hours of sunshine
  • UV (maximum) index 5 (Moderate)5
    UV index (Moderate)
  • 48% chance of some rain48
    % chance of some rain
  • 10-20 mm of rainfall expected<20
    mm of rainfall expected
  • 17°C wind chill17
    °C wind chill
  • Light breeze of 12 kph from the East12
    kph wind from E

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Thunder Bay weather for Thursday 25th June 2026

Expect sunshine and showers in Thunder Bay, Ontario with a maximum temperature of 19°C, maximum UV of 3 (Moderate) and 7 hours of bright sunshine. There are 0-2 mm of rainfall expected with 54% chance of some rain and a light breeze of 9 kph from the north.

  • 19°C maximum temperature19
    °C maximum temperature
  • 9°C minimum temperature9
    °C minimum temperature
  • Sunshine and showers
    sunshine and showers
  • 7 hours of bright sunshine7
    hours of sunshine
  • UV (maximum) index 3 (Moderate)3
    UV index (Moderate)
  • 54% chance of some rain54
    % chance of some rain
  • 0-2 mm of rainfall expected<2
    mm of rainfall expected
  • No heat & humidity0
    no heat & humidity
  • Light breeze of 9 kph from the North9
    kph wind from N

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