Thunder Bay weather live forecast

Today's maximum temperature in Thunder Bay is expected to be 11°C. Select a day from the live weather forecast for Thunder Bay, Ontario, Canada for more weather parameters.

  • Sunday
    17th May
    Mostly cloudy with light rain (0-2 mm of rainfall expected)
  • Monday
    18th May
    Isolated thunderstorms (10-20 mm of rainfall expected)
  • Tuesday
    19th May
    Cloudy with sleet or snow (10-20 mm of rainfall expected)
  • Wednesday
    20th May
    Mostly cloudy with light snow (0-2 cm of snow expected)
  • Thursday
    21st May
    Broken clouds

5-day weather forecast updated at 04:00 on Sunday 17th 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 Sunday 17th May 2026

Expect mostly cloudy with light rain in Thunder Bay, Ontario with a maximum temperature of 11°C, maximum UV of 6 (High) and 6 hours of bright sunshine. There are 0-2 mm of rainfall expected with 77% chance of some rain and a gentle breeze of 18 kph from the east.

  • 11°C maximum temperature11
    °C maximum temperature
  • 2°C minimum temperature2
    °C minimum temperature
  • Mostly cloudy with light rain
    mostly cloudy with light rain
  • 6 hours of bright sunshine6
    hours of sunshine
  • UV (maximum) index 6 (High)6
    UV index (High)
  • 77% chance of some rain77
    % chance of some rain
  • 0-2 mm of rainfall expected<2
    mm of rainfall expected
  • 11°C wind chill11
    °C wind chill
  • Gentle breeze of 18 kph from the East18
    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 11°C, maximum UV of 3 (Moderate) and no hours of bright sunshine. There are 10-20 mm of rainfall expected with 76% chance of some rain and a moderate breeze of 20 kph from the north-east.

  • 11°C maximum temperature11
    °C maximum temperature
  • 5°C minimum temperature5
    °C minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • No hours of bright sunshine0
    hours of sunshine
  • UV (maximum) index 3 (Moderate)3
    UV index (Moderate)
  • 76% chance of some rain76
    % chance of some rain
  • 10-20 mm of rainfall expected<20
    mm of rainfall expected
  • 11°C wind chill11
    °C wind chill
  • Moderate breeze of 20 kph from the North-East20
    kph wind from NE

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Thunder Bay weather for Tuesday 19th May 2026

Expect cloudy with sleet or snow in Thunder Bay, Ontario with a maximum temperature of 6°C, maximum UV of 2 (Low) and no hours of bright sunshine. There are 10-20 mm of sleet/snow expected with 67% chance of some sleet or snow and a gentle breeze of 17 kph from the north.

  • 6°C maximum temperature6
    °C maximum temperature
  • 0°C minimum temperature0
    °C minimum temperature
  • Cloudy with sleet or snow
    cloudy with sleet or snow
  • No hours of bright sunshine0
    hours of sunshine
  • UV (maximum) index 2 (Low)2
    UV index (Low)
  • 67% chance of some sleet or snow67
    % chance of some sleet or snow
  • 10-20 mm of sleet/snow expected<20
    mm of sleet/snow expected
  • 3°C wind chill3
    °C wind chill
  • Gentle breeze of 17 kph from the North17
    kph wind from N

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Thunder Bay weather for Wednesday 20th May 2026

Expect mostly cloudy with light snow in Thunder Bay, Ontario with a maximum temperature of 10°C, maximum UV of 4 (Moderate) and 5 hours of bright sunshine. There are 0-2 cm of snow expected with 26% chance of some snow and a gentle breeze of 19 kph from the north-west.

  • 10°C maximum temperature10
    °C maximum temperature
  • -1°C minimum temperature-1
    °C minimum temperature
  • Mostly cloudy with light snow
    mostly cloudy with light snow
  • 5 hours of bright sunshine5
    hours of sunshine
  • UV (maximum) index 4 (Moderate)4
    UV index (Moderate)
  • 26% chance of some snow26
    % chance of some snow
  • 0-2 cm of snow expected<2
    cm of snow expected
  • 7°C wind chill7
    °C wind chill
  • Gentle breeze of 19 kph from the North-West19
    kph wind from NW

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Thunder Bay weather for Thursday 21st May 2026

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of 15°C, maximum UV of 6 (High) and 3 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 17 kph from the south.

  • 15°C maximum temperature15
    °C maximum temperature
  • 0°C minimum temperature0
    °C minimum temperature
  • Broken clouds
    broken clouds
  • 3 hours of bright sunshine3
    hours of sunshine
  • UV (maximum) index 6 (High)6
    UV index (High)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • 15°C wind chill15
    °C wind chill
  • Gentle breeze of 17 kph from the South17
    kph wind from S

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