A Wintry Whisper to Start the Weekend
THUNDER BAY – WEATHER – Thunder Bay is easing into Saturday with a touch of the season we all thought we were done with.
As of 7:00 AM at the Thunder Bay Airport, it’s a brisk 0.8°C, under mostly cloudy skies. A light north wind is blowing at 6 km/h, which makes it feel just a little cooler, though not unpleasantly so. The humidity sits at 82% with a dew point of -1.9°C, keeping the air crisp.
Visibility is great at 32 km—perfect for spotting those elusive early-morning sunbeams if they manage to break through.
This morning brings a 40 percent chance of flurries, and yes, a risk of freezing drizzle is also on the table—because nothing says “April in Northern Ontario” like surprise ice. Thankfully, conditions should improve by midday. The temperature will climb to a high of 7°C, and the UV index sits at a moderate 3, offering a bit of a boost to anyone brave enough to enjoy the outdoors.
Tonight: Clear Skies and Crisp Conditions
Late this evening, skies will clear out, but fog patches are expected to form after midnight—an eerie but beautiful setup if you’re out for a nighttime stroll. Winds remain gentle, up to 15 km/h, but temperatures will drop sharply to a low of -7°C. Wind chill values will dip to around -9°C overnight, so don’t let the clear skies fool you—this one’s a cold one.
Sunday Brings the Sun (But Not Without a Morning Chill)
Sunday is shaping up to be the weekend’s golden child. Expect sunny skies throughout the day with fog patches clearing by morning. However, brace yourself for a frigid start: wind chill values will hover near -14°C in the early hours. Winds will come from the southeast at 20 km/h but become light in the afternoon, giving way to a pleasant high of 9°C. The UV index rises to 5, which is moderate—so sunscreen is advised, especially if you’re out on the trails or by the lake.
Sunday night will bring back the clouds, but the low stays mild at +1°C, giving us a bit of a break from the freezing temperatures.
Monday Turns Grey Again, But Sunshine Returns Tuesday
Monday brings back that familiar mix of uncertainty, with cloudy skies and a 40 percent chance of snow or rain throughout the day. Temperatures will reach a high of 10°C, which is still on the milder side. Monday night keeps the same cloudy trend going, with another 40 percent chance of snow or rain and a low of +1°C.
Tuesday, thankfully, returns to sunny skies and a high of 8°C. But by Tuesday night, clouds roll back in and temperatures rise slightly to a low of +3°C.
What to Wear
This weekend calls for dressing in layers you can peel off (or pile on) as needed. For today, go with a warm jacket, and make sure your footwear is ready for slick sidewalks in case of freezing drizzle. Tonight and early Sunday require full winter gear—the wind chill near -14°C will catch you off guard. By Sunday afternoon, a light spring coat or fleece should do the trick. Keep the umbrella handy for Monday—just in case the clouds decide to weep.
Weather Trivia: Thunder Bay’s Spring Flashbacks
Thunder Bay has seen quite the range of temperatures on April 19. The warmest recorded was a sweet 21.6°C in 1991, while the coldest dipped down to -13.5°C in 1983. So, while today’s high of 7°C may not seem like much, it could be worse—and Sunday’s 9°C with sunshine is basically VIP spring treatment by local standards.
