Grab your gloves this morning—fall’s crispness has arrived! But sunshine and warm temperatures are not far behind

THUNDER BAY – WEATHER – It’s a cold start to the day in Thunder Bay, with clear skies and temperatures just above freezing. I

f you’re heading out early, gloves, a warm jacket, and even a toque wouldn’t go amiss. Fortunately, the sun will warm things up quickly, and a beautiful stretch of fall weather continues into the weekend, with a brief risk of showers and a thunderstorm overnight.

Today’s Weather Overview

Current Conditions

As of 7:00 AM EDT from Thunder Bay Airport, the temperature is a chilly 4.4°C, with a dew point of 4.1°C and humidity at 98%—meaning frost may have formed in rural and low-lying areas.

Winds are light from the west-southwest at 6 km/h, and visibility is excellent at 24 km under clear skies.
Barometric pressure is rising at 101.6 kPa, a sign of stable conditions for much of the day.

Forecast for Friday:

• Sunny skies throughout the day.

• High of 18°C—a cool but pleasant fall afternoon.

• UV index: 5 (moderate) — don’t forget sunscreen if you’ll be outdoors midday.

Tonight:

• Clear skies early, becoming partly cloudy before morning.

• 40% chance of showers overnight, with a risk of a thunderstorm near dawn.

• Low: 8°C — milder than last night.

Weekend Weather Outlook

Saturday, September 27:

• A mix of sun and cloud, with a 40% chance of showers and risk of a thunderstorm early in the morning.

• Clearing later in the morning, leading to a beautiful fall afternoon.

• Winds becoming west at 30 km/h, gusting to 50 km/h — expect breezy conditions.

• High: 21°C.

• UV index: 5 (moderate).

• Night: Clear skies and a low of 7°C.

Sunday, September 28:

• Sunny and warm — perfect for outdoor activities.

• High of 23°C — well above seasonal.

• Night: Clear and cool, with a low of 6°C.

Monday, September 29:

• Sunny once again, with a comfortable high of 20°C.

• Night: A few clouds moving in.
  Low of 9°C.

Wardrobe Recommendations

The weather this weekend calls for layering to stay comfortable from chilly mornings to warm afternoons:

• Friday Morning:

  • Warm layers — gloves, a scarf, and a jacket are recommended early in the day.

• Afternoons (Friday–Sunday):

  • Shed layers as the sun warms things up. Long sleeves, light sweaters, or flannels are ideal.

• Saturday Morning:

  • Bring a rain jacket or umbrella just in case of an early shower or storm.

  • Windbreaker recommended due to gusty afternoon winds.

• Evenings:

  • Expect cool nights — a jacket or fleece will keep you cozy.

Weather Trivia

Did you know?
Thunder Bay recorded its earliest September frost at just -1.1°C on September 26, 1991. While no frost was officially reported this morning, temperatures close to 4°C with clear skies and calm winds create ideal conditions for localized frost, especially outside the urban core. Fall mornings like today are classic “radiation cooling” setups, where the heat of the day escapes rapidly overnight under clear skies.

Bundle up early, enjoy the sunshine by afternoon, and prepare for a mild and mostly beautiful weekend ahead!Stay tuned to the NetNewsLedger Weather Desk for updates.