Thunder Bay weather live forecast

Today's maximum temperature in Thunder Bay is expected to be 4°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 Friday 20th March 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

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

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 Friday 20th March 2026

Expect mostly cloudy with light snow in Thunder Bay, Ontario with a maximum temperature of 4°C, maximum UV of 3 (Moderate) and 4 hours of bright sunshine. There are 2-5 cm of snow expected with 8% chance of some snow and a light breeze of 12 kph from the north-west.

  • 4°C maximum temperature4
    °C maximum temperature
  • -4°C minimum temperature-4
    °C minimum temperature
  • Mostly cloudy with light snow
    mostly cloudy with light snow
  • 4 hours of bright sunshine4
    hours of sunshine
  • UV (maximum) index 3 (Moderate)3
    UV index (Moderate)
  • 8% chance of some snow8
    % chance of some snow
  • 2-5 cm of snow expected<5
    cm of snow expected
  • 2°C wind chill2
    °C wind chill
  • Light breeze of 12 kph from the North-West12
    kph wind from NW

Back to top

Thunder Bay weather for Saturday 21st March 2026

Expect cloudy with some snow in Thunder Bay, Ontario with a maximum temperature of 2°C, maximum UV of 1 (Low) and no hours of bright sunshine. There are 5-10 cm of snow expected with 84% chance of some snow and a gentle breeze of 14 kph from the north-east.

  • 2°C maximum temperature2
    °C maximum temperature
  • -3°C minimum temperature-3
    °C minimum temperature
  • Cloudy with some snow
    cloudy with some snow
  • No hours of bright sunshine0
    hours of sunshine
  • UV (maximum) index 1 (Low)1
    UV index (Low)
  • 84% chance of some snow84
    % chance of some snow
  • 5-10 cm of snow expected<10
    cm of snow expected
  • -2°C wind chill-2
    °C wind chill
  • Gentle breeze of 14 kph from the North-East14
    kph wind from NE

Back to top

Thunder Bay weather for Sunday 22nd March 2026

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of -1°C, maximum UV of 3 (Moderate) and 4 hours of bright sunshine. There are 0 cm of snow expected and a gentle breeze of 16 kph from the north-east.

  • -1°C maximum temperature-1
    °C maximum temperature
  • -6°C minimum temperature-6
    °C minimum temperature
  • Broken clouds
    broken clouds
  • 4 hours of bright sunshine4
    hours of sunshine
  • UV (maximum) index 3 (Moderate)3
    UV index (Moderate)
  • 0 cm of snow expected0
    cm of snow expected
  • -5°C wind chill-5
    °C wind chill
  • Gentle breeze of 16 kph from the North-East16
    kph wind from NE

Back to top

Thunder Bay weather for Monday 23rd March 2026

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of 1°C, maximum UV of 3 (Moderate) and 4 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 13 kph from the south.

  • 1°C maximum temperature1
    °C maximum temperature
  • -8°C minimum temperature-8
    °C minimum temperature
  • Broken clouds
    broken clouds
  • 4 hours of bright sunshine4
    hours of sunshine
  • UV (maximum) index 3 (Moderate)3
    UV index (Moderate)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • -3°C wind chill-3
    °C wind chill
  • Gentle breeze of 13 kph from the South13
    kph wind from S

Back to top

Thunder Bay weather for Tuesday 24th March 2026

Expect clear skies with flurries of snow in Thunder Bay, Ontario with a maximum temperature of 2°C, maximum UV of 3 (Moderate) and 6 hours of bright sunshine. There are 0-2 cm of snow expected with 68% chance of some snow and a gentle breeze of 19 kph from the north-west.

  • 2°C maximum temperature2
    °C maximum temperature
  • -6°C minimum temperature-6
    °C minimum temperature
  • Clear skies with flurries of snow
    clear skies with flurries of snow
  • 6 hours of bright sunshine6
    hours of sunshine
  • UV (maximum) index 3 (Moderate)3
    UV index (Moderate)
  • 68% chance of some snow68
    % chance of some snow
  • 0-2 cm of snow expected<2
    cm of snow expected
  • -2°C wind chill-2
    °C wind chill
  • Gentle breeze of 19 kph from the North-West19
    kph wind from NW

Back to top

ALL sale: Top winter deals on North America hotels

  • Save on hotel stays in North America with Accor
  • ALL-Accor Live Limitless members get extra 10% off
  • Travel before 31st May 2026 (inclusive)
Go to ALL deal >>

Expires at 23:59 on Monday 30th Mar 2026 · View all ALL offers

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

Back to top

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 ^