A Chilly Start, a Sunny Midweek, and the Return of Rain (and Maybe Flurries) by Friday
THUNDER BAY – WEATHER – Good morning from the shores of Lake Superior, where Thunder Bay is enjoying a quiet but crisp start to the day. At 6:00 AM EDT, it’s 2.4°C under mostly cloudy skies. Winds are relatively calm—just enough to nip at your ears—with speeds up to 15 km/h expected later today. The barometric pressure is holding at 100.8 kPa and on the rise, indicating a touch of weather stability before some changes roll in. Humidity is at 67%, and the early morning wind chill makes it feel more like -9°C. Yep—winter’s not done whispering quite yet.
Today: Sunshine and Slight Warmth on the Menu
The clouds will make way for sun as the day moves along, bringing a dose of vitamin D to the northwestern Ontario air. Winds stay gentle, and the high will reach a mild 6°C—enough for a pleasant walk downtown or a lunchtime loop around Marina Park. The UV index hits a moderate 5, so you’ll want those sunglasses even if your jacket says “February.”
Tonight: Clear Skies, Crisp Air
Tonight’s forecast remains clear and calm. Winds will stick around at up to 15 km/h, and the temperature will dip to -3°C with a wind chill near -7°C. Perfect conditions for some star-gazing—just make sure you’ve got a toque and mitts on standby.
Thursday: A Little of Everything
Thursday starts off with a mix of sun and cloud, but don’t get too cozy—there’s a 60% chance of afternoon showers. Winds will shift to the northeast and increase to 20 km/h by late morning. The high will be around 7°C, and with a wind chill near -6°C in the morning, you’ll want to bundle up early before shedding layers later. UV index holds steady at 5. By Thursday night, that rain may mix with snow as temperatures hover around +3°C.
Friday: Flurries or Showers—Take Your Pick
Friday looks grey and damp with a 60% chance of either rain showers or flurries, and a high around 7°C. Welcome to April in Thunder Bay, where the skies can’t quite make up their minds. The night will stay cloudy with the low falling to -5°C.
The Weekend: Sunshine for the Win
Thankfully, the weekend forecast brings a break from the back-and-forth. Saturday will be sunny with a high of 6°C, and Sunday steps it up to 10°C with another full day of sunshine. If you’ve been itching to get out and enjoy some true spring weather, Sunday’s your day.
Weather History: April 16 in Thunder Bay
The warmest April 16 on record in Thunder Bay reached a springlike 23.0°C, while the coldest chilled all the way down to -17.1°C. Today’s 2°C start? Somewhere comfortably in the middle of the historical mix, with that classic Lake Superior spring cool-down still keeping things modest.
What to Wear?
Think “layered lumberjack” chic today—start with a thermal or flannel, add a mid-weight jacket, and don’t forget the gloves for the morning wind chill. You may be peeling off a layer by midday, but you’ll want to bundle back up for the evening.
Did You Know?
Thunder Bay is one of Canada’s sunniest cities in spring, often clocking in more sunshine hours than many southern Ontario spots. So while it may still feel like winter some mornings, at least you’ve got the sun on your side!
