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 Saturday 15th August 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 15th August 2026

Expect mostly cloudy with light rain in Thunder Bay, Ontario with a maximum temperature of 20°C, maximum UV of 3 (Moderate) and 1 hour of bright sunshine. There are 2-5 mm of rainfall expected with 68% chance of some rain and a gentle breeze of 13 kph from the east.

  • 20°C maximum temperature20
    °C maximum temperature
  • 14°C minimum temperature14
    °C minimum temperature
  • Mostly cloudy with light rain
    mostly cloudy with light rain
  • 1 hour of bright sunshine1
    hour of sunshine
  • UV (maximum) index 3 (Moderate)3
    UV index (Moderate)
  • 68% chance of some rain68
    % chance of some rain
  • 2-5 mm of rainfall expected<5
    mm of rainfall expected
  • No heat & humidity0
    no heat & humidity
  • Gentle breeze of 13 kph from the East13
    kph wind from E

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Thunder Bay weather for Sunday 16th August 2026

Expect sunshine and showers in Thunder Bay, Ontario with a maximum temperature of 25°C, maximum UV of 5 (Moderate) and 6 hours of bright sunshine. There are 0-2 mm of rainfall expected with 6% chance of some rain and a gentle breeze of 19 kph from the north-west.

  • 25°C maximum temperature25
    °C maximum temperature
  • 14°C minimum temperature14
    °C minimum temperature
  • Sunshine and showers
    sunshine and showers
  • 6 hours of bright sunshine6
    hours of sunshine
  • UV (maximum) index 5 (Moderate)5
    UV index (Moderate)
  • 6% chance of some rain6
    % chance of some rain
  • 0-2 mm of rainfall expected<2
    mm of rainfall expected
  • 25°C wind chill25
    °C wind chill
  • Gentle breeze of 19 kph from the North-West19
    kph wind from NW

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Thunder Bay weather for Monday 17th August 2026

Expect sunshine and showers in Thunder Bay, Ontario with a maximum temperature of 27°C, low levels of heat & humidity, maximum UV of 5 (Moderate) and 10 hours of bright sunshine. There are 0-2 mm of rainfall expected with 34% chance of some rain and a gentle breeze of 15 kph from the south-west.

  • 27°C maximum temperature27
    °C maximum temperature
  • 13°C minimum temperature13
    °C minimum temperature
  • Sunshine and showers
    sunshine and showers
  • 10 hours of bright sunshine10
    hours of sunshine
  • UV (maximum) index 5 (Moderate)5
    UV index (Moderate)
  • 34% chance of some rain34
    % chance of some rain
  • 0-2 mm of rainfall expected<2
    mm of rainfall expected
  • Low heat & humidityL
    low heat & humidity
  • Gentle breeze of 15 kph from the South-West15
    kph wind from SW

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Thunder Bay weather for Tuesday 18th August 2026

Expect isolated thunderstorms in Thunder Bay, Ontario with a maximum temperature of 25°C, maximum UV of 4 (Moderate) and 6 hours of bright sunshine. There are 2-5 mm of rainfall expected with 43% chance of some rain and a light breeze of 12 kph from the north-west.

  • 25°C maximum temperature25
    °C maximum temperature
  • 13°C minimum temperature13
    °C minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • 6 hours of bright sunshine6
    hours of sunshine
  • UV (maximum) index 4 (Moderate)4
    UV index (Moderate)
  • 43% chance of some rain43
    % chance of some rain
  • 2-5 mm of rainfall expected<5
    mm of rainfall expected
  • No heat & humidity0
    no heat & humidity
  • Light breeze of 12 kph from the North-West12
    kph wind from NW

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Thunder Bay weather for Wednesday 19th August 2026

Expect sunshine and showers in Thunder Bay, Ontario with a maximum temperature of 22°C, maximum UV of 6 (High) and 8 hours of bright sunshine. There are 0-2 mm of rainfall expected with 18% chance of some rain and a gentle breeze of 14 kph from the north.

  • 22°C maximum temperature22
    °C maximum temperature
  • 11°C minimum temperature11
    °C minimum temperature
  • Sunshine and showers
    sunshine and showers
  • 8 hours of bright sunshine8
    hours of sunshine
  • UV (maximum) index 6 (High)6
    UV index (High)
  • 18% chance of some rain18
    % chance of some rain
  • 0-2 mm of rainfall expected<2
    mm of rainfall expected
  • 22°C wind chill22
    °C wind chill
  • Gentle breeze of 14 kph from the North14
    kph wind from N

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