Thunder Bay weather live forecast

Today's maximum temperature in Thunder Bay is expected to be 23°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 Saturday 27th 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 Saturday 27th June 2026

Expect scattered clouds in Thunder Bay, Ontario with a maximum temperature of 23°C, maximum UV of 7 (High) and 14 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 12 kph from the south-east.

  • 23°C maximum temperature23
    °C maximum temperature
  • 10°C minimum temperature10
    °C minimum temperature
  • Scattered clouds
    scattered clouds
  • 14 hours of bright sunshine14
    hours of sunshine
  • UV (maximum) index 7 (High)7
    UV index (High)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • 23°C wind chill23
    °C wind chill
  • Light breeze of 12 kph from the South-East12
    kph wind from SE

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Thunder Bay weather for Sunday 28th June 2026

Expect isolated thunderstorms in Thunder Bay, Ontario with a maximum temperature of 20°C, maximum UV of 7 (High) and 7 hours of bright sunshine. There are 0-2 mm of rainfall expected with 43% chance of some rain and a gentle breeze of 18 kph from the east.

  • 20°C maximum temperature20
    °C maximum temperature
  • 10°C minimum temperature10
    °C minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • 7 hours of bright sunshine7
    hours of sunshine
  • UV (maximum) index 7 (High)7
    UV index (High)
  • 43% chance of some rain43
    % chance of some rain
  • 0-2 mm of rainfall expected<2
    mm of rainfall expected
  • No heat & humidity0
    no heat & humidity
  • Gentle breeze of 18 kph from the East18
    kph wind from E

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Thunder Bay weather for Monday 29th June 2026

Expect isolated thunderstorms in Thunder Bay, Ontario with a maximum temperature of 21°C, maximum UV of 6 (High) and 4 hours of bright sunshine. There are 5-10 mm of rainfall expected with 46% chance of some rain and a gentle breeze of 15 kph from the east.

  • 21°C maximum temperature21
    °C maximum temperature
  • 11°C minimum temperature11
    °C minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • 4 hours of bright sunshine4
    hours of sunshine
  • UV (maximum) index 6 (High)6
    UV index (High)
  • 46% chance of some rain46
    % chance of some rain
  • 5-10 mm of rainfall expected<10
    mm of rainfall expected
  • 21°C wind chill21
    °C wind chill
  • Gentle breeze of 15 kph from the East15
    kph wind from E

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Thunder Bay weather for Tuesday 30th June 2026

Expect isolated thunderstorms in Thunder Bay, Ontario with a maximum temperature of 28°C, low levels of heat & humidity, maximum UV of 5 (Moderate) and 10 hours of bright sunshine. There are 5-10 mm of rainfall expected with 53% chance of some rain and a gentle breeze of 13 kph from the south.

  • 28°C maximum temperature28
    °C maximum temperature
  • 12°C minimum temperature12
    °C minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • 10 hours of bright sunshine10
    hours of sunshine
  • UV (maximum) index 5 (Moderate)5
    UV index (Moderate)
  • 53% chance of some rain53
    % chance of some rain
  • 5-10 mm of rainfall expected<10
    mm of rainfall expected
  • Low heat & humidityL
    low heat & humidity
  • Gentle breeze of 13 kph from the South13
    kph wind from S

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Thunder Bay weather for Wednesday 1st July 2026

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of 26°C, maximum UV of 7 (High) and 9 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 13 kph from the south-west.

  • 26°C maximum temperature26
    °C maximum temperature
  • 14°C minimum temperature14
    °C minimum temperature
  • Broken clouds
    broken clouds
  • 9 hours of bright sunshine9
    hours of sunshine
  • UV (maximum) index 7 (High)7
    UV index (High)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • 26°C wind chill26
    °C wind chill
  • Gentle breeze of 13 kph from the South-West13
    kph wind from SW

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