Thunder Bay – WEATHER – Family Day is shaping up with a welcome break from the deep freeze. Thunder Bay is under mainly sunny skies this morning, and temperatures will climb above freezing this afternoon.

The catch is what comes after sunset: clear skies tonight allow temperatures to tumble back into the double digits below zero, with fog patches possible overnight.

By midweek, the pattern turns more active again, with a 70% chance of snow on Wednesday and breezier conditions.

Today’s Weather Overview

Current Conditions

As of 10:00 AM EST Monday, February 16, Thunder Bay is mainly sunny with:

• Temperature: -2.6°C

• Wind: WSW 8 km/h

• Wind chill: -6

• Humidity: 96%

• Pressure: 101.0 kPa, rising

• Visibility: 32 km

That very high humidity is a heads-up for tonight’s forecast note about fog patches.

Family Day: This Afternoon

Clearing continues through the day with a high near +4°C. With the sun out and light winds, it’ll feel fairly comfortable for outdoor plans—especially compared to earlier February cold snaps. Melting will kick in on sunny sidewalks and driveways, so expect wet patches and slush in spots.

Expected Conditions (Next 3 Days)

Tonight (Monday night):
Clear, with fog patches overnight.

• Low: -11°C

• Wind: up to 15 km/h

• Wind chill: near -15 overnight
  Refreeze is likely wherever daytime meltwater sits on pavement.

Tuesday, February 17:
Sunny and still relatively mild by February standards.

• High: +2°C

• Morning wind chill: near -16

• UV index: 1 (Low)
  Tuesday night: Cloudy, low -6°C.

Wednesday, February 18:
Cloudy with a 70% chance of snow and windy conditions.

• High: -3°C
  Wednesday night: Cloudy with a 40% chance of flurries, low -8°C.

Wardrobe Recommendations

Family Day is a “layers and traction” kind of day:

• This afternoon (+4): a warm mid-layer and a lighter winter jacket works well, especially if you’re moving around.

• Footwear: waterproof boots with good grip—melting and slush can turn to slick ice quickly later.

• Tonight and Tuesday morning: bring the heavier gear back—hat, mitts, and a neck warmer matter when wind chills dip into the mid-minus teens.

If you’re driving around town for Family Day visits, keep winter windshield washer fluid topped up—melting snow and road spray can make visibility ugly fast.

Weather Trivia

Clear winter nights often feel colder than cloudy ones. Without cloud cover, heat escapes more quickly from the surface after sunset—so even after a mild afternoon, temperatures can drop sharply overnight (and that’s also when fog patches can form if moisture is high).

Summary

Thunder Bay Family Day forecast for Monday, February 16, 2026: mainly sunny with a high near +4°C and melting/slushy spots. Clear tonight with fog patches possible and a low near -11°C. Sunny Tuesday (+2°C), then windy with a 70% chance of snow Wednesday.