THUNDER BAY – WEATHER DESK – If April showers bring May flowers, Thunder Bay may be ready for a colourful month ahead. After weeks of stubborn grey skies, today finally brings a welcome dose of sunshine—so yes, it may be time to find those sunglasses.

Today’s Weather Overview

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 kPa and falling
Visibility: 24 km

Today starts chilly, but brighter. Expect sunny skies early, with increasing cloudiness near noon.

Winds will become north at 20 km/h, then ease this afternoon. High 8°C. Morning wind chill near -7. UV index 6, or high.

Extended Weather Forecast

Expected Conditions

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

Saturday, May 2: Sunny, becoming a mix of sun and cloud in the afternoon. Southeast wind 20 km/h late in the morning. High 12°C. UV index 6, or high.

Sunday, May 3: A mix of sun and cloud with a 40% chance of showers. High 12°C. Sunday night brings a 60% chance of rain showers or flurries.

Wardrobe Recommendations

Start with a warm jacket, gloves, and layers for the below-freezing morning. Keep sunglasses handy, especially with the high UV index. A lighter layer may work by afternoon, but keep a jacket nearby as clouds increase.

Weather Trivia

Thunder Bay’s spring sunshine can be deceiving. Even with a high UV index, cold air and Lake Superior’s influence can keep mornings feeling wintry well into May.

Summary

Thunder Bay weather for May 1, 2026: Sunshine returns with increasing cloudiness near noon, high 8°C, and a high UV index. Warmer weather arrives Saturday.