Thunder Bay weather live forecast

Today's maximum temperature in Thunder Bay is expected to be 8°C. Select a day from the live weather forecast for Thunder Bay, Ontario, Canada for more weather parameters.

  • Wednesday
    15th Apr
    Broken clouds
  • Thursday
    16th Apr
    Fog in low lying areas
  • Friday
    17th Apr
    Isolated thunderstorms (5-10 mm of rainfall expected)
  • Saturday
    18th Apr
    Cloudy with sleet or snow (2-5 mm of rainfall expected)
  • Sunday
    19th Apr
    Mostly cloudy with light snow (0-2 cm of snow expected)

5-day weather forecast updated at 04:00 on Wednesday 15th April 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 Wednesday 15th April 2026

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of 8°C, maximum UV of 5 (Moderate) and 4 hours of bright sunshine. There are 0 mm of rainfall expected and little or no wind of 6 kph from the north-west.

  • 8°C maximum temperature8
    °C maximum temperature
  • 2°C minimum temperature2
    °C minimum temperature
  • Broken clouds
    broken clouds
  • 4 hours of bright sunshine4
    hours of sunshine
  • UV (maximum) index 5 (Moderate)5
    UV index (Moderate)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • 7°C wind chill7
    °C wind chill
  • Little or no wind of 6 kph from the North-West6
    kph wind from NW

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Thunder Bay weather for Thursday 16th April 2026

Expect fog in low lying areas in Thunder Bay, Ontario with a maximum temperature of 9°C, maximum UV of 5 (Moderate) and 5 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 8 kph from the south-east.

  • 9°C maximum temperature9
    °C maximum temperature
  • 1°C minimum temperature1
    °C minimum temperature
  • Fog in low lying areas
    fog in low lying areas
  • 5 hours of bright sunshine5
    hours of sunshine
  • UV (maximum) index 5 (Moderate)5
    UV index (Moderate)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • 8°C wind chill8
    °C wind chill
  • Light breeze of 8 kph from the South-East8
    kph wind from SE

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Thunder Bay weather for Friday 17th April 2026

Expect isolated thunderstorms in Thunder Bay, Ontario with a maximum temperature of 7°C, maximum UV of 5 (Moderate) and 1 hour of bright sunshine. There are 5-10 mm of rainfall expected with 92% chance of some rain and a gentle breeze of 16 kph from the east.

  • 7°C maximum temperature7
    °C maximum temperature
  • 1°C minimum temperature1
    °C minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • 1 hour of bright sunshine1
    hour of sunshine
  • UV (maximum) index 5 (Moderate)5
    UV index (Moderate)
  • 92% chance of some rain92
    % chance of some rain
  • 5-10 mm of rainfall expected<10
    mm of rainfall expected
  • 4°C wind chill4
    °C wind chill
  • Gentle breeze of 16 kph from the East16
    kph wind from E

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Thunder Bay weather for Saturday 18th April 2026

Expect cloudy with sleet or snow in Thunder Bay, Ontario with a maximum temperature of 3°C, maximum UV of 3 (Moderate) and 1 hour of bright sunshine. There are 2-5 mm of sleet/snow expected with 68% chance of some sleet or snow and a moderate breeze of 24 kph from the north-west.

  • 3°C maximum temperature3
    °C maximum temperature
  • -5°C minimum temperature-5
    °C minimum temperature
  • Cloudy with sleet or snow
    cloudy with sleet or snow
  • 1 hour of bright sunshine1
    hour of sunshine
  • UV (maximum) index 3 (Moderate)3
    UV index (Moderate)
  • 68% chance of some sleet or snow68
    % chance of some sleet or snow
  • 2-5 mm of sleet/snow expected<5
    mm of sleet/snow expected
  • -2°C wind chill-2
    °C wind chill
  • Moderate breeze of 24 kph from the North-West24
    kph wind from NW

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Thunder Bay weather for Sunday 19th April 2026

Expect mostly cloudy with light snow in Thunder Bay, Ontario with a maximum temperature of 2°C, maximum UV of 4 (Moderate) and 3 hours of bright sunshine. There are 0-2 cm of snow expected with 23% chance of some snow and a moderate breeze of 23 kph from the north-west.

  • 2°C maximum temperature2
    °C maximum temperature
  • -6°C minimum temperature-6
    °C minimum temperature
  • Mostly cloudy with light snow
    mostly cloudy with light snow
  • 3 hours of bright sunshine3
    hours of sunshine
  • UV (maximum) index 4 (Moderate)4
    UV index (Moderate)
  • 23% chance of some snow23
    % chance of some snow
  • 0-2 cm of snow expected<2
    cm of snow expected
  • -4°C wind chill-4
    °C wind chill
  • Moderate breeze of 23 kph from the North-West23
    kph wind from NW

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