Thunder Bay weather live forecast

Today's maximum temperature in Thunder Bay is expected to be 20°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 Friday 17th July 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 Friday 17th July 2026

Expect isolated thunderstorms in Thunder Bay, Ontario with a maximum temperature of 20°C, maximum UV of 6 (High) and 2 hours of bright sunshine. There are 10-20 mm of rainfall expected with 91% chance of some rain and a light breeze of 12 kph from the east.

  • 20°C maximum temperature20
    °C maximum temperature
  • 14°C minimum temperature14
    °C minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • 2 hours of bright sunshine2
    hours of sunshine
  • UV (maximum) index 6 (High)6
    UV index (High)
  • 91% chance of some rain91
    % chance of some rain
  • 10-20 mm of rainfall expected<20
    mm of rainfall expected
  • No heat & humidity0
    no heat & humidity
  • Light breeze of 12 kph from the East12
    kph wind from E

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Thunder Bay weather for Saturday 18th July 2026

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of 26°C, low levels of heat & humidity, maximum UV of 5 (Moderate) and 8 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 18 kph from the north-west.

  • 26°C maximum temperature26
    °C maximum temperature
  • 14°C minimum temperature14
    °C minimum temperature
  • Broken clouds
    broken clouds
  • 8 hours of bright sunshine8
    hours of sunshine
  • UV (maximum) index 5 (Moderate)5
    UV index (Moderate)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • Low heat & humidityL
    low heat & humidity
  • Gentle breeze of 18 kph from the North-West18
    kph wind from NW

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Thunder Bay weather for Sunday 19th July 2026

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of 27°C, low levels of heat & humidity, maximum UV of 4 (Moderate) and 8 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 14 kph from the south.

  • 27°C maximum temperature27
    °C maximum temperature
  • 15°C minimum temperature15
    °C minimum temperature
  • Broken clouds
    broken clouds
  • 8 hours of bright sunshine8
    hours of sunshine
  • UV (maximum) index 4 (Moderate)4
    UV index (Moderate)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • Low heat & humidityL
    low heat & humidity
  • Gentle breeze of 14 kph from the South14
    kph wind from S

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Thunder Bay weather for Monday 20th July 2026

Expect isolated thunderstorms in Thunder Bay, Ontario with a maximum temperature of 30°C, moderate levels of heat & humidity, maximum UV of 6 (High) and 6 hours of bright sunshine. There are 5-10 mm of rainfall expected with 70% chance of some rain and a gentle breeze of 19 kph from the west.

  • 30°C maximum temperature30
    °C maximum temperature
  • 14°C minimum temperature14
    °C minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • 6 hours of bright sunshine6
    hours of sunshine
  • UV (maximum) index 6 (High)6
    UV index (High)
  • 70% chance of some rain70
    % chance of some rain
  • 5-10 mm of rainfall expected<10
    mm of rainfall expected
  • Moderate heat & humidityM
    moderate heat & humidity
  • Gentle breeze of 19 kph from the West19
    kph wind from W

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Thunder Bay weather for Tuesday 21st July 2026

Expect isolated thunderstorms in Thunder Bay, Ontario with a maximum temperature of 21°C, maximum UV of 2 (Low) and 6 hours of bright sunshine. There are 2-5 mm of rainfall expected with 30% chance of some rain and a moderate breeze of 26 kph from the north-west.

  • 21°C maximum temperature21
    °C maximum temperature
  • 14°C minimum temperature14
    °C minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • 6 hours of bright sunshine6
    hours of sunshine
  • UV (maximum) index 2 (Low)2
    UV index (Low)
  • 30% chance of some rain30
    % chance of some rain
  • 2-5 mm of rainfall expected<5
    mm of rainfall expected
  • 21°C wind chill21
    °C wind chill
  • Moderate breeze of 26 kph from the North-West26
    kph wind from NW

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