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 Wednesday 10th 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 Wednesday 10th June 2026

Expect isolated thunderstorms in Thunder Bay, Ontario with a maximum temperature of 18°C, maximum UV of 3 (Moderate) and no hours of bright sunshine. There are 10-20 mm of rainfall expected with 96% chance of some rain and a gentle breeze of 15 kph from the east.

  • 18°C maximum temperature18
    °C maximum temperature
  • 10°C minimum temperature10
    °C minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • No hours of bright sunshine0
    hours of sunshine
  • UV (maximum) index 3 (Moderate)3
    UV index (Moderate)
  • 96% chance of some rain96
    % chance of some rain
  • 10-20 mm of rainfall expected<20
    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 Thursday 11th June 2026

Expect isolated thunderstorms in Thunder Bay, Ontario with a maximum temperature of 24°C, maximum UV of 7 (High) and 14 hours of bright sunshine. There are 5-10 mm of rainfall expected with 58% chance of some rain and a moderate breeze of 22 kph from the south-west.

  • 24°C maximum temperature24
    °C maximum temperature
  • 12°C minimum temperature12
    °C minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • 14 hours of bright sunshine14
    hours of sunshine
  • UV (maximum) index 7 (High)7
    UV index (High)
  • 58% chance of some rain58
    % chance of some rain
  • 5-10 mm of rainfall expected<10
    mm of rainfall expected
  • 24°C wind chill24
    °C wind chill
  • Moderate breeze of 22 kph from the South-West22
    kph wind from SW

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Thunder Bay weather for Friday 12th June 2026

Expect sunshine and showers in Thunder Bay, Ontario with a maximum temperature of 22°C, maximum UV of 6 (High) and 7 hours of bright sunshine. There are 2-5 mm of rainfall expected with 46% chance of some rain and a moderate breeze of 23 kph from the west.

  • 22°C maximum temperature22
    °C maximum temperature
  • 12°C minimum temperature12
    °C minimum temperature
  • Sunshine and showers
    sunshine and showers
  • 7 hours of bright sunshine7
    hours of sunshine
  • UV (maximum) index 6 (High)6
    UV index (High)
  • 46% chance of some rain46
    % chance of some rain
  • 2-5 mm of rainfall expected<5
    mm of rainfall expected
  • No heat & humidity0
    no heat & humidity
  • Moderate breeze of 23 kph from the West23
    kph wind from W

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Thunder Bay weather for Saturday 13th June 2026

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of 19°C, maximum UV of 3 (Moderate) and 3 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 21 kph from the west.

  • 19°C maximum temperature19
    °C maximum temperature
  • 11°C minimum temperature11
    °C minimum temperature
  • Broken clouds
    broken clouds
  • 3 hours of bright sunshine3
    hours of sunshine
  • UV (maximum) index 3 (Moderate)3
    UV index (Moderate)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • 19°C wind chill19
    °C wind chill
  • Moderate breeze of 21 kph from the West21
    kph wind from W

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Thunder Bay weather for Sunday 14th June 2026

Expect clear skies in Thunder Bay, Ontario with a maximum temperature of 19°C, maximum UV of 7 (High) and 15 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 23 kph from the north-west.

  • 19°C maximum temperature19
    °C maximum temperature
  • 7°C minimum temperature7
    °C minimum temperature
  • Clear skies
    clear skies
  • 15 hours of bright sunshine15
    hours of sunshine
  • UV (maximum) index 7 (High)7
    UV index (High)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • No heat & humidity0
    no heat & humidity
  • Moderate breeze of 23 kph from the North-West23
    kph wind from NW

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