THUNDER BAY – Weather – Thunder Bay is starting Monday morning with clear skies, fresh air, and cool temperatures near 8°C. While sunshine will dominate early, expect increasing clouds around midday, leading to a possible shower or thunderstorm by late tonight.

Temperatures will warm comfortably to around 22°C by afternoon, with a very high UV index.

Today’s Weather Overview

Current Conditions – 7:00 AM EDT

• Location: Thunder Bay Airport

• Temperature: 8.3°C

• Condition: Mainly Sunny

• Pressure: 101.9 kPa (Rising)

• Humidity: 99%

• Dew Point: 8.2°C

• Wind: West at 7 km/h

• Visibility: Excellent (32 km)

Monday Forecast – July 7, 2025

Daytime

• Morning: Sunny and cool.

• Afternoon: Increasing clouds, becoming partly cloudy by noon.

• High Temperature: 22°C

• UV Index: 8 (Very high – protection strongly recommended)

Tonight

• Conditions: Mainly cloudy with a 30% chance of showers and a risk of thunderstorms developing late in the evening and overnight.

• Low Temperature: 13°C

• Wind: Calm to light breeze from the west.

Extended Weather Forecast

Tuesday, July 8

• Conditions: Mixed sun and cloud, with a 60% chance of showers and a risk of thunderstorms.

• High: Cooler at 17°C

• Night: Clearing skies overnight, with temperatures cooling to 10°C.

Wednesday, July 9

• Conditions: Sunny and warmer.

• High: 24°C

• Night: Clear skies continue, cool night at 10°C.

Thursday, July 10

• Conditions: Continued sunny skies.

• High: 22°C

• Night: Partly cloudy, low around 13°C.

Wardrobe Recommendations

• Today: Light layers are recommended—cool this morning but comfortably warm this afternoon. Sunglasses and sunscreen will be essential for the high UV index.

• Tonight: A jacket or umbrella may be useful if outdoors, as showers and thunderstorms are possible.

Weather Trivia

Did You Know?
Thunder Bay’s cool mornings and sunny summer afternoons are partly due to its proximity to Lake Superior, which moderates temperatures and can quickly shift local weather patterns.