Sunshine Returns to Thunder Bay on May 1, 2026

THUNDER BAY – WEATHER DESK – If April showers lead to May flowers, Thunder Bay is gearing up for a colorful month. After enduring several weeks of dull gray skies, today finally brings a refreshing burst of sunshine-so it’s probably time to dig out those sunglasses.

Current Conditions

Observed at Thunder Bay Airport at 7:00 AM EDT:

Condition: Mostly cloudy
Temperature: -2.2°C
Wind Chill: -6
Wind: Southwest at 10 km/h
Humidity: 82%
Pressure: 101.9 k Pa and falling
Visibility: 24 km

Today kicks off chilly but brighter. Expect sunny skies early on, with clouds rolling in around noon.

Winds will shift northward at 20 km/h before calming down this afternoon. Highs reaching 8°C. Morning wind chill feels like -7. UV index is high at 6.

Expected Conditions

Tonight: Mainly cloudy, clearing up around midnight. Low of -4°C, with wind chill near -6 overnight.

Saturday, May 2: Sunny in the morning, then turning into a mix of sun and clouds by afternoon. Southeast winds at 20 km/h late morning. High expected at 12°C. UV index remains high at 6.

Sunday, May 3: A blend of sun and clouds with a chance of showers sitting at about 40%. High of 12°C. Sunday night could bring rain or flurries with a chance up to 60%.

Start your day bundled up in a warm jacket, gloves, and layers for the chilly morning temperatures below freezing. Keep your sunglasses close because of that high UV index! You might be fine in lighter layers by the afternoon but keep your jacket handy as more clouds move in.

Thunder Bay’s spring sunshine can be tricky. Even with that high UV index, the cold air combined with Lake Superior’s influence can make mornings feel wintery well into May.

Thunder Bay weather forecast for May 1, 2026 shows sunshine returning with clouds increasing by noon; expect a high of 8°C and a notable UV index today while warmer temperatures arrive on Saturday.

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