Thunder Bay weather live forecast

Today's maximum temperature in Thunder Bay is expected to be 2°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 Sunday 19th April 2026 GMT

More about Thunder Bay

Thunder Bay by month

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

Recommended for Ontario

Hurtigruten: Latest offers on worldwide cruises

  • Explore latest special offers on Hurtigruten Expeditions
  • Includes online discount, no single supplement & more
  • Browse top online deals & destination specific offers
Go to Hurtigruten 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 Sunday 19th April 2026

Expect scattered clouds in Thunder Bay, Ontario with a maximum temperature of 2°C, maximum UV of 4 (Moderate) and 9 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 23 kph from the north-west.

  • 2°C maximum temperature2
    °C maximum temperature
  • -7°C minimum temperature-7
    °C minimum temperature
  • Scattered clouds
    scattered clouds
  • 9 hours of bright sunshine9
    hours of sunshine
  • UV (maximum) index 4 (Moderate)4
    UV index (Moderate)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • -3°C wind chill-3
    °C wind chill
  • Moderate breeze of 23 kph from the North-West23
    kph wind from NW

Back to top

Thunder Bay weather for Monday 20th April 2026

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of 5°C, maximum UV of 4 (Moderate) and 3 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 23 kph from the south.

  • 5°C maximum temperature5
    °C maximum temperature
  • -6°C minimum temperature-6
    °C minimum temperature
  • Broken clouds
    broken clouds
  • 3 hours of bright sunshine3
    hours of sunshine
  • UV (maximum) index 4 (Moderate)4
    UV index (Moderate)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • 0°C wind chill0
    °C wind chill
  • Moderate breeze of 23 kph from the South23
    kph wind from S

Back to top

Thunder Bay weather for Tuesday 21st April 2026

Expect clear skies in Thunder Bay, Ontario with a maximum temperature of 13°C, maximum UV of 5 (Moderate) and 14 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 12 kph from the north-west.

  • 13°C maximum temperature13
    °C maximum temperature
  • 2°C minimum temperature2
    °C minimum temperature
  • Clear skies
    clear skies
  • 14 hours of bright sunshine14
    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
  • Light breeze of 12 kph from the North-West12
    kph wind from NW

Back to top

Thunder Bay weather for Wednesday 22nd April 2026

Expect mostly cloudy with light rain in Thunder Bay, Ontario with a maximum temperature of 13°C, maximum UV of 6 (High) and 4 hours of bright sunshine. There are 0-2 mm of rainfall expected with 21% chance of some rain and a light breeze of 11 kph from the south-east.

  • 13°C maximum temperature13
    °C maximum temperature
  • 1°C minimum temperature1
    °C minimum temperature
  • Mostly cloudy with light rain
    mostly cloudy with light rain
  • 4 hours of bright sunshine4
    hours of sunshine
  • UV (maximum) index 6 (High)6
    UV index (High)
  • 21% chance of some rain21
    % chance of some rain
  • 0-2 mm of rainfall expected<2
    mm of rainfall expected
  • No heat & humidity0
    no heat & humidity
  • Light breeze of 11 kph from the South-East11
    kph wind from SE

Back to top

Thunder Bay weather for Thursday 23rd April 2026

Expect isolated thunderstorms in Thunder Bay, Ontario with a maximum temperature of 8°C, maximum UV of 3 (Moderate) and 10 hours of bright sunshine. There are 5-10 mm of rainfall expected with 83% chance of some rain and a gentle breeze of 18 kph from the east.

  • 8°C maximum temperature8
    °C maximum temperature
  • 3°C minimum temperature3
    °C minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • 10 hours of bright sunshine10
    hours of sunshine
  • UV (maximum) index 3 (Moderate)3
    UV index (Moderate)
  • 83% chance of some rain83
    % chance of some rain
  • 5-10 mm of rainfall expected<10
    mm of rainfall expected
  • 6°C wind chill6
    °C wind chill
  • Gentle breeze of 18 kph from the East18
    kph wind from E

Back to top

Canadian Affair: Latest special offers on holidays

  • Save on holidays to Canada with top deals & discounts
  • Book holidays, cruises, ski breaks & tours to Canada
  • Offers include discounts, upgrades & more
Go to Canadian Affair deal >>

View all Canadian Affair offers

More about Ontario

Related posts

Popular travel offers

Explore holiday destinations

More holidays

Save with latest deals & discounts

More deals

Airport parking

More parking

Airport lounges

More lounges

Top ^