Thunder Bay weather live forecast

Tomorrow's maximum temperature in Thunder Bay is expected to be 4°C.

  • Monday
    14th Apr
    Sunshine and showers (0-2 mm of rainfall expected)
  • Tuesday
    15th Apr
    Broken clouds
  • Wednesday
    16th Apr
    Clear skies
  • Thursday
    17th Apr
    Mostly cloudy with rain (5-10 mm of rainfall expected)
  • Friday
    18th Apr
    Mostly cloudy with light rain (2-5 mm of rainfall expected)

5-day weather forecast updated at 04:00 on Tuesday 15th April 2025 GMT

More about Thunder Bay

Thunder Bay by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Recommended for Ontario

AirHelp: Claim compensation on delayed flights

  • If your flight has been delayed or cancelled
  • Claim up to £520 compensation per passenger
  • No win, no fee. All airlines & countries
Go to AirHelp deal >>

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 Monday 14th April 2025

Expect sunshine and showers in Thunder Bay, Ontario with a maximum temperature of 4°C, maximum UV of 1 (Low) and 10 hours of bright sunshine. There are 0-2 mm of rainfall expected with 98% chance of some rain and a moderate breeze of 28 kph from the north-west.

  • 4°C maximum temperature4
    °C maximum temperature
  • 0°C minimum temperature0
    °C minimum temperature
  • Sunshine and showers
    sunshine and showers
  • 10 hours of bright sunshine10
    hours of sunshine
  • UV (maximum) index 1 (Low)1
    UV index (Low)
  • 98% chance of some rain98
    % chance of some rain
  • 0-2 mm of rainfall expected<2
    mm of rainfall expected
  • -1°C wind chill-1
    °C wind chill
  • Moderate breeze of 28 kph from the North-West28
    kph wind from NW

Back to top

Thunder Bay weather for Tuesday 15th April 2025

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of 4°C, maximum UV of 3 (Moderate) and 7 hours of bright sunshine. There are 0 mm of rainfall expected and a fresh breeze of 29 kph from the north-west.

  • 4°C maximum temperature4
    °C maximum temperature
  • -2°C minimum temperature-2
    °C minimum temperature
  • Broken clouds
    broken clouds
  • 7 hours of bright sunshine7
    hours of sunshine
  • UV (maximum) index 3 (Moderate)3
    UV index (Moderate)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • -1°C wind chill-1
    °C wind chill
  • Fresh breeze of 29 kph from the North-West29
    kph wind from NW

Back to top

Thunder Bay weather for Wednesday 16th April 2025

Expect clear skies in Thunder Bay, Ontario with a maximum temperature of 6°C, maximum UV of 5 (Moderate) and 13 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 14 kph from the north-west.

  • 6°C maximum temperature6
    °C maximum temperature
  • -5°C minimum temperature-5
    °C minimum temperature
  • Clear skies
    clear skies
  • 13 hours of bright sunshine13
    hours of sunshine
  • UV (maximum) index 5 (Moderate)5
    UV index (Moderate)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • 3°C wind chill3
    °C wind chill
  • Gentle breeze of 14 kph from the North-West14
    kph wind from NW

Back to top

Thunder Bay weather for Thursday 17th April 2025

Expect mostly cloudy with rain in Thunder Bay, Ontario with a maximum temperature of 7°C, maximum UV of 4 (Moderate) and 3 hours of bright sunshine. There are 5-10 mm of rainfall expected with 69% chance of some rain and a gentle breeze of 18 kph from the east.

  • 7°C maximum temperature7
    °C maximum temperature
  • -2°C minimum temperature-2
    °C minimum temperature
  • Mostly cloudy with rain
    mostly cloudy with rain
  • 3 hours of bright sunshine3
    hours of sunshine
  • UV (maximum) index 4 (Moderate)4
    UV index (Moderate)
  • 69% chance of some rain69
    % 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 18 kph from the East18
    kph wind from E

Back to top

Thunder Bay weather for Friday 18th April 2025

Expect mostly cloudy with light rain in Thunder Bay, Ontario with a maximum temperature of 8°C, maximum UV of 5 (Moderate) and 3 hours of bright sunshine. There are 2-5 mm of rainfall expected with 40% chance of some rain and a moderate breeze of 21 kph from the north.

  • 8°C maximum temperature8
    °C maximum temperature
  • 1°C minimum temperature1
    °C minimum temperature
  • Mostly cloudy with light rain
    mostly cloudy with light rain
  • 3 hours of bright sunshine3
    hours of sunshine
  • UV (maximum) index 5 (Moderate)5
    UV index (Moderate)
  • 40% chance of some rain40
    % chance of some rain
  • 2-5 mm of rainfall expected<5
    mm of rainfall expected
  • 5°C wind chill5
    °C wind chill
  • Moderate breeze of 21 kph from the North21
    kph wind from N

Back to top

Cosmos: up to £900 savings on 2026 tours

  • Save up to £900 per couple on 2026 tours worldwide
  • Discount varies by destination. T&Cs apply
  • Travel between 1st Jan & 31st Dec 2026 (inclusive)
Go to Cosmos deal >>

Expires at 23:59 on Tuesday 30th Sep 2025 · View all Cosmos offers

CosmosTour deal finder

Metric (°C / mm)  |  Imperial (°F / inches)

Back to top

More about Ontario

Related posts

Popular travel offers

Explore holidays in the sun for less

More holidays

Airport parking

More parking

Airport lounges

More lounges

Top ^