Thunder Bay – WEATHER – The city on the Bay starts Tuesday under cloudy skies with temperatures just above freezing. Spring is still moving slowly, with northwest winds, a chilly morning, and a chance of flurries changing to rain showers later today.
Today’s Weather Overview
Current Conditions
Observed at Thunder Bay Airport at 7:00 AM EDT:
Condition: Cloudy
Temperature: 0.7°C
Wind: WNW 18 km/h
Humidity: 64%
Pressure: 100.3 kPa and rising
Visibility: 32 km
Today will stay cloudy with a 40% chance of flurries, changing to a 30% chance of rain showers or flurries near noon. Northwest winds will blow at 20 km/h, gusting to 40. High 6°C, with a morning wind chill near -7. UV index 3, or moderate.
Tomorrow’s Forecast
Expected Conditions
Tonight: Cloudy with a 30% chance of flurries or rain showers this evening. Northwest wind becomes light. Low 0°C.
Wednesday, May 6: Becoming a mix of sun and cloud in the morning, with a 40% chance of flurries or rain showerslate morning and afternoon. High 8°C. UV index 5, or moderate.
Thursday, May 7: A mix of sun and cloud with a 30% chance of rain showers or flurries. High 7°C. Clear and colder Thursday night, low -4°C.
Marine Weather: Western Lake Superior
A Strong Wind Warning is in effect for Western Lake Superior. Environment Canada’s marine forecast calls for northwest winds of 20 knots, diminishing to west 15 knots near noon and northwest 10 knots early this evening. Waves of 1 to 1.5 metres are expected to subside to 0.5 to 1 metre this evening. Ice conditions include mostly open water, with some very thick lake ice still reported in Thunder Bay and parts of the northwestern shore.
Wardrobe Recommendations
Dress for a cold spring day: warm jacket, gloves for the morning, and wind-resistant layers. Waterproof footwear is useful with flurries or rain showers possible. For boaters, today is a poor day for small craft on Western Lake Superior due to strong winds and choppy water.
Weather Trivia
Thunder Bay’s May weather can flip quickly between rain and flurries because cold air moving over Lake Superior keeps the lower atmosphere chilly well into spring.
Weather Overview
Thunder Bay weather for May 5, 2026: Cloudy and cool with flurries or rain showers possible, high 6°C, gusty northwest winds, and a Strong Wind Warning for Western Lake Superior.
