Thunder Bay weather live forecast

Today's maximum temperature in Thunder Bay is expected to be 12°C. Select a day from the live weather forecast for Thunder Bay, Ontario, Canada for more weather parameters.

  • Thursday
    14th May
    Scattered clouds
  • Friday
    15th May
    Sunshine and showers (2-5 mm of rainfall expected)
  • Saturday
    16th May
    Broken clouds
  • Sunday
    17th May
    Mostly cloudy with light rain (2-5 mm of rainfall expected)
  • Monday
    18th May
    Isolated thunderstorms (20-30 mm of rainfall expected)

5-day weather forecast updated at 04:00 on Thursday 14th May 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 Thursday 14th May 2026

Expect scattered clouds in Thunder Bay, Ontario with a maximum temperature of 12°C, maximum UV of 6 (High) and 13 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 16 kph from the south-east.

  • 12°C maximum temperature12
    °C maximum temperature
  • 3°C minimum temperature3
    °C minimum temperature
  • Scattered clouds
    scattered clouds
  • 13 hours of bright sunshine13
    hours of sunshine
  • UV (maximum) index 6 (High)6
    UV index (High)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • No heat & humidity0
    no heat & humidity
  • Gentle breeze of 16 kph from the South-East16
    kph wind from SE

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Thunder Bay weather for Friday 15th May 2026

Expect sunshine and showers in Thunder Bay, Ontario with a maximum temperature of 19°C, maximum UV of 6 (High) and 8 hours of bright sunshine. There are 2-5 mm of rainfall expected with 33% chance of some rain and a moderate breeze of 20 kph from the south.

  • 19°C maximum temperature19
    °C maximum temperature
  • 5°C minimum temperature5
    °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)
  • 33% chance of some rain33
    % chance of some rain
  • 2-5 mm of rainfall expected<5
    mm of rainfall expected
  • 19°C wind chill19
    °C wind chill
  • Moderate breeze of 20 kph from the South20
    kph wind from S

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Thunder Bay weather for Saturday 16th May 2026

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of 15°C, maximum UV of 5 (Moderate) and 7 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 21 kph from the west.

  • 15°C maximum temperature15
    °C maximum temperature
  • 7°C minimum temperature7
    °C minimum temperature
  • Broken clouds
    broken clouds
  • 7 hours of bright sunshine7
    hours of sunshine
  • UV (maximum) index 5 (Moderate)5
    UV index (Moderate)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • No heat & humidity0
    no heat & humidity
  • Moderate breeze of 21 kph from the West21
    kph wind from W

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Thunder Bay weather for Sunday 17th May 2026

Expect mostly cloudy with light rain in Thunder Bay, Ontario with a maximum temperature of 9°C, maximum UV of 6 (High) and 3 hours of bright sunshine. There are 2-5 mm of rainfall expected with 43% chance of some rain and a gentle breeze of 16 kph from the east.

  • 9°C maximum temperature9
    °C maximum temperature
  • 3°C minimum temperature3
    °C minimum temperature
  • Mostly cloudy with light rain
    mostly cloudy with light rain
  • 3 hours of bright sunshine3
    hours of sunshine
  • UV (maximum) index 6 (High)6
    UV index (High)
  • 43% chance of some rain43
    % chance of some rain
  • 2-5 mm of rainfall expected<5
    mm of rainfall expected
  • 7°C wind chill7
    °C wind chill
  • Gentle breeze of 16 kph from the East16
    kph wind from E

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Thunder Bay weather for Monday 18th May 2026

Expect isolated thunderstorms in Thunder Bay, Ontario with a maximum temperature of 13°C, maximum UV of 1 (Low) and no hours of bright sunshine. There are 20-30 mm of rainfall expected with 82% chance of some rain and a gentle breeze of 19 kph from the east.

  • 13°C maximum temperature13
    °C maximum temperature
  • 4°C minimum temperature4
    °C minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • No hours of bright sunshine0
    hours of sunshine
  • UV (maximum) index 1 (Low)1
    UV index (Low)
  • 82% chance of some rain82
    % chance of some rain
  • 20-30 mm of rainfall expected<30
    mm of rainfall expected
  • 13°C wind chill13
    °C wind chill
  • Gentle breeze of 19 kph from the East19
    kph wind from E

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