Stormy Start, Snowy Surprise, and a Sunny Sunday Ahead
THUNDER BAY, ON – WEATHER REPORT – April 17, 2025 – The Easter weekend forecast in Thunder Bay is playing all the greatest spring hits—from thunderstorms and rain to flurries and sunshine. If you’re staying in town or heading out for the long weekend, prepare for a little bit of everything. The good news? By Sunday, Mother Nature finally decides to show her sunny side.
Current Conditions: Chilly and Calm… for Now
As of 6:00 AM EDT at Thunder Bay Airport, the temperature is -0.6°C under partly cloudy skies. The dew point is -2.5°C with humidity at 87%, and winds are blowing in from the east-northeast at 14 km/h. With a wind chill of -5°C, it’s a brisk start to the day. Visibility is clear at 24 km, while the barometric pressure reads 101.6 kPa and falling—a sign of the unsettled weather moving in later.
Thursday: From Sunshine to Storm Risk
Expect a mix of sun and cloud today, with the weather turning more dramatic late this afternoon. There’s a 40% chance of showers later in the day, with the added risk of a thunderstorm—a classic spring surprise for the Lake Superior shoreline. Winds will increase from the east to 20 km/h by midday, and the high will reach 9°C. This morning’s wind chill of -8°C will ease as the sun strengthens, so hang tight—it gets more comfortable quickly. The UV index hits a moderate 5, so if you’re outdoors, a bit of sun protection is smart.
Tonight: Rain Rolls In with a Rumble
Showers will turn into steady rain this evening, and there’s a risk of a thunderstorm early on. Rainfall amounts could reach 10 to 15 mm. Winds will ease later in the evening, and temperatures will hold steady around +3°C. Keep the umbrella close and your ears peeled for the odd rumble—April thundershowers are rare, but not impossible here.
Friday: Rain Ends, But Clouds and Snow Linger
Friday begins with periods of rain, tapering off by late morning. The skies remain cloudy with a 40% chance of lingering showers, and winds will shift from the northwest at 20 km/h. The high tops out at 7°C, but by nightfall, colder air returns, bringing a 60% chance of snow or rain and a low of -3°C.
Saturday: Flurries and Bright Breaks
Saturday brings a mix of sun and cloud with a 30% chance of flurries. The high will only reach +4°C, and skies clear overnight with temperatures dropping to -6°C. Not exactly picnic weather, but a step in the right direction!
Sunday: The Easter Treat – Sun Returns!
Easter Sunday brings the sunshine! Expect clear skies and a high of 7°C—perfect for family gatherings or getting out to stretch those cabin-fevered legs. Sunday night cools to -1°C with some cloudy periods and a 30% chance of snow.
Monday: Back to Mixed Precipitation
Monday brings back the unpredictability, with periods of snow or rain and a high near 5°C. Overnight, there’s a 40% chance of more rain or snow, and a low around the freezing mark.
What to Wear
Today calls for layers and a raincoat for later. Pack warm clothes and waterproof footwear if you’re travelling Friday or Saturday. By Sunday, you’ll finally be able to break out the lighter spring jacket—but don’t ditch the mitts just yet for those chilly nights.
Did You Know?
Thunder Bay is one of the snowiest cities in Ontario, often topping 300 cm annually. So don’t be surprised by those lingering flurries—spring always takes the scenic route here!
