Thunder Bay weather live forecast

Today's maximum temperature in Thunder Bay is expected to be -9°C. Select a day from the live weather forecast for Thunder Bay, Ontario, Canada for more weather parameters.

5-day weather forecast updated at 04:01 on Friday 19th December 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

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 Friday 19th December 2025

Expect clear skies with flurries of snow in Thunder Bay, Ontario with a maximum temperature of -9°C, maximum UV of 1 (Low) and 6 hours of bright sunshine. There are 2-5 cm of snow expected with 67% chance of some snow and a moderate breeze of 27 kph from the north-west.

  • -9°C maximum temperature-9
    °C maximum temperature
  • -20°C minimum temperature-20
    °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 1 (Low)1
    UV index (Low)
  • 67% chance of some snow67
    % chance of some snow
  • 2-5 cm of snow expected<5
    cm of snow expected
  • -17°C wind chill-17
    °C wind chill
  • Moderate breeze of 27 kph from the North-West27
    kph wind from NW

Back to top

Thunder Bay weather for Saturday 20th December 2025

Expect mostly cloudy with light snow in Thunder Bay, Ontario with a maximum temperature of -5°C and 1 hour of bright sunshine. There are 0-2 cm of snow expected with 23% chance of some snow and a moderate breeze of 25 kph from the west.

  • -5°C maximum temperature-5
    °C maximum temperature
  • -16°C minimum temperature-16
    °C minimum temperature
  • Mostly cloudy with light snow
    mostly cloudy with light snow
  • 1 hour of bright sunshine1
    hour of sunshine
  • No UV (maximum) index0
    UV index (None)
  • 23% chance of some snow23
    % chance of some snow
  • 0-2 cm of snow expected<2
    cm of snow expected
  • -13°C wind chill-13
    °C wind chill
  • Moderate breeze of 25 kph from the West25
    kph wind from W

Back to top

Thunder Bay weather for Sunday 21st December 2025

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of -13°C, maximum UV of 1 (Low) and 5 hours of bright sunshine. There are 0 cm of snow expected and a moderate breeze of 23 kph from the north-west.

  • -13°C maximum temperature-13
    °C maximum temperature
  • -20°C minimum temperature-20
    °C minimum temperature
  • Broken clouds
    broken clouds
  • 5 hours of bright sunshine5
    hours of sunshine
  • UV (maximum) index 1 (Low)1
    UV index (Low)
  • 0 cm of snow expected0
    cm of snow expected
  • -22°C wind chill-22
    °C wind chill
  • Moderate breeze of 23 kph from the North-West23
    kph wind from NW

Back to top

Thunder Bay weather for Monday 22nd December 2025

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of -3°C, maximum UV of 1 (Low) and 2 hours of bright sunshine. There are 0 cm of snow expected and a light breeze of 9 kph from the south.

  • -3°C maximum temperature-3
    °C maximum temperature
  • -16°C minimum temperature-16
    °C minimum temperature
  • Broken clouds
    broken clouds
  • 2 hours of bright sunshine2
    hours of sunshine
  • UV (maximum) index 1 (Low)1
    UV index (Low)
  • 0 cm of snow expected0
    cm of snow expected
  • -6°C wind chill-6
    °C wind chill
  • Light breeze of 9 kph from the South9
    kph wind from S

Back to top

Thunder Bay weather for Tuesday 23rd December 2025

Expect mostly cloudy with light snow in Thunder Bay, Ontario with a maximum temperature of -5°C, maximum UV of 1 (Low) and no hours of bright sunshine. There are 0-2 cm of snow expected with 24% chance of some snow and a gentle breeze of 14 kph from the north-west.

  • -5°C maximum temperature-5
    °C maximum temperature
  • -17°C minimum temperature-17
    °C minimum temperature
  • Mostly cloudy with light snow
    mostly cloudy with light snow
  • No hours of bright sunshine0
    hours of sunshine
  • UV (maximum) index 1 (Low)1
    UV index (Low)
  • 24% chance of some snow24
    % chance of some snow
  • 0-2 cm of snow expected<2
    cm of snow expected
  • -10°C wind chill-10
    °C wind chill
  • Gentle breeze of 14 kph from the North-West14
    kph wind from NW

Back to top

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 >>

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 ^