Thunder Bay weather live forecast

Today's maximum temperature in Thunder Bay is expected to be 20°C. Select a day from the live weather forecast for Thunder Bay, Ontario, Canada for more weather parameters.

• Monday
  25th May
  20
  4
  
  8
  UV5
• Tuesday
  26th May
  22
  12
  
  13
  UV7
• Wednesday
  27th May
  20
  9
  
  12
  UV6
• Thursday
  28th May
  19
  7
  
  16
  UV7
• Friday
  29th May
  23
  6
  
  12
  UV7

5-day weather forecast updated at 04:00 on Monday 25th May 2026 GMT

More about Thunder Bay

• 
  Best time to visit
• 
  Weather by month
• 
  Destinations
• 
  Travel guide
• 
  Deals & discounts

Thunder Bay by month

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

Recommended for Ontario

• TUI^*
• Jack's Flight Club^*
• Hilton^*
• Travelsphere^*

Air Canada: Top flight deals to Canada

Sale

• Discover top Air Canada offers on flights to Canada
• Browse lowest fares available or search by date
• Book flights to Toronto, Vancouver, Calgary, Montreal & more

Go to Air Canada deal >>

View all Air Canada 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 Monday 25th May 2026

Expect isolated thunderstorms in Thunder Bay, Ontario with a maximum temperature of 20°C, maximum UV of 5 (Moderate) and 8 hours of bright sunshine. There are 0-2 mm of rainfall expected with 41% chance of some rain and a gentle breeze of 14 kph from the east.

• 20
  °C maximum temperature
• 4
  °C minimum temperature
• 
  isolated thunderstorms
• 8
  hours of sunshine
• UV5
  UV index (Moderate)
• 41
  % chance of some rain
• <2
  mm of rainfall expected
• 20
  °C wind chill
• 14
  kph wind from E

Back to top

Thunder Bay weather for Tuesday 26th May 2026

Expect scattered clouds in Thunder Bay, Ontario with a maximum temperature of 22°C, maximum UV of 7 (High) and 13 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 14 kph from the north-west.

• 22
  °C maximum temperature
• 12
  °C minimum temperature
• 
  scattered clouds
• 13
  hours of sunshine
• UV7
  UV index (High)
• 0
  mm of rainfall expected
• 0
  no heat & humidity
• 14
  kph wind from NW

Back to top

Thunder Bay weather for Wednesday 27th May 2026

Expect scattered clouds in Thunder Bay, Ontario with a maximum temperature of 20°C, maximum UV of 6 (High) and 12 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 13 kph from the east.

• 20
  °C maximum temperature
• 9
  °C minimum temperature
• 
  scattered clouds
• 12
  hours of sunshine
• UV6
  UV index (High)
• 0
  mm of rainfall expected
• 20
  °C wind chill
• 13
  kph wind from E

Back to top

Thunder Bay weather for Thursday 28th May 2026

Expect clear skies in Thunder Bay, Ontario with a maximum temperature of 19°C, maximum UV of 7 (High) and 16 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 11 kph from the south-east.

• 19
  °C maximum temperature
• 7
  °C minimum temperature
• 
  clear skies
• 16
  hours of sunshine
• UV7
  UV index (High)
• 0
  mm of rainfall expected
• 19
  °C wind chill
• 11
  kph wind from SE

Back to top

Thunder Bay weather for Friday 29th May 2026

Expect scattered clouds in Thunder Bay, Ontario with a maximum temperature of 23°C, maximum UV of 7 (High) and 12 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 9 kph from the north.

• 23
  °C maximum temperature
• 6
  °C minimum temperature
• 
  scattered clouds
• 12
  hours of sunshine
• UV7
  UV index (High)
• 0
  mm of rainfall expected
• 0
  no heat & humidity
• 9
  kph wind from N

Back to top

Air Canada: Top flight deals to Canada

Sale

• Discover top Air Canada offers on flights to Canada
• Browse lowest fares available or search by date
• Book flights to Toronto, Vancouver, Calgary, Montreal & more

Go to Air Canada deal >>

View all Air Canada offers

More about Ontario

Related posts

Popular travel offers

Explore holiday destinations

• Beach holidays
• City breaks
• Family holidays
• Half term holidays
• Spring holidays
• Summer holidays
• Autumn holidays
• Winter sun holidays
• Honeymoons
• Coolcations
• Compare places
• Ski resorts

More holidays

Save with latest deals & discounts

• Holiday offers
• Top travel brands
• Airlines & flights
• Discount hotels
• TUI
• Jet2holidays
• Neilson
• Marella Cruises
• Holiday Extras
• Pierre & Vacances
• Caledonian Travel
• Club Med

More deals

Airport parking

• Manchester Airport
• Stansted Airport
• Bristol Airport
• Luton Airport
• Birmingham Airport
• Edinburgh Airport
• Gatwick Airport
• Glasgow Airport
• Newcastle Airport

More parking

Airport lounges

• Manchester Airport
• Birmingham Airport
• Bristol Airport
• Edinburgh Airport
• Glasgow Airport
• Heathrow Airport
• Newcastle Airport
• Stansted Airport
• Gatwick Airport

More lounges

Top ^