Wet and Wild Start to the Week in Thunder Bay
Thunder Bay is in for a soggy start to the week as a Rainfall Warning has been issued for the area. As of 5:11 PM EDT on Sunday, April 27, 2025, conditions at the Thunder Bay Airport report light rain, with a temperature of 10.4°C, a humidity level of 57%, and a south wind blowing at 16 km/h. Barometric pressure is sitting at 102.1 kPa but falling — a clear sign that stormy weather is knocking on the door.
Today’s historic temperature records for Thunder Bay tell us that the warmest it ever got on April 27 was a toasty 26.1°C, while the chilliest low dipped down to a frosty -9.4°C. So, while today’s 10°C might seem dreary, it could definitely be worse!
Monday’s Forecast: Bring the Ark, Not Just an Umbrella
Looking ahead to Monday, April 28, residents can expect a cloudy start with a 30% chance of showers in the morning. However, by the afternoon, rain at times heavy will move in, with total rainfall expected between 30 and 50 mm. Thunderstorms may crash the party too, so it could be quite a dramatic day weather-wise! Temperatures will hover around 10°C, and the UV index will reach a moderate 4, not that you’ll see much sun through all those clouds.
By Monday night, the rain intensifies with another 15 to 25 mm possible. Winds will shift to northwest at 20 km/h in the evening and later whip up to a brisk north wind at 40 km/h, gusting up to 60 km/h after midnight. Temperatures will slide down to the freezing mark by morning — so don’t be surprised if puddles turn into slippery patches by Tuesday!
The Midweek Forecast: A Frosty Turn
Tuesday, April 29, will feel more like a confused April Fool’s prank than late April. Expect cloudy skies with a 40% chance of flurries (yes, flurries!) and breezy conditions throughout the day. The high will reach only 7°C. The temperature then nosedives to -6°C overnight under clear skies, so dust off that toque!
By Wednesday, April 30, sunshine returns, and temperatures will rebound to a pleasant 11°C. Clouds move back in by night with a 30% chance of showers and a low near 2°C.
Wardrobe Wisdom
Prepare for an outfit battle against the elements! For Monday, waterproof everything is the name of the game: rain jackets, umbrellas, and rubber boots are highly recommended. Layer up with a sweater underneath to stay warm as temperatures won’t climb much. For Tuesday, bring out the warm coat and gloves—you’ll need them!
A Bit of Weather Wisdom for Thunder Bay
Did you know? Thunder Bay holds a quirky record for experiencing snow in every single month of the year! While rare in the summer months, it’s not impossible—so those flurries on Tuesday are just Thunder Bay keeping up traditions!
