Misty Morning in Thunder Bay Clears for a Hot, Smoky Afternoon

Thunder Bay – Weather – After a night of wet, with lots of rain on Wednesday today starts with better fortunes across the city.

Did your basement flood?

Thunder Bay begins the day with calm winds and misty skies, a result of 100% humidity and saturated air. Conditions will improve throughout the morning as skies clear, but local smoke will remain present. As we head into the weekend, temperatures will rise steadily, bringing elevated humidex values and the chance of light showers by Saturday night.

Today’s Weather Overview

Current Conditions

As of 7:00 AM EDT at Thunder Bay Airport:

• Temperature: 15.5°C

• Wind: South-southwest at 7 km/h

• Humidity: 100%

• Dew Point: 15.5°C

• Barometric Pressure: 101.3 kPa (rising)

• Visibility: 10 km

• Condition: Mist, with air saturated from overnight cooling

The mist will clear by late morning, giving way to sunshine and local smoke. Temperatures are expected to climb to a high of 27°C, with a humidex of 32, making it feel quite warm and muggy. The UV index is 8 – very high, so make sure to apply sunscreen and seek shade during peak sun hours.

Tonight, skies will remain clear, though local smoke will persist. Overnight lows will drop to a pleasant 14°C.

Extended Weekend Weather Forecast

Expected Conditions

Friday, July 25:
A sunny day is forecasted, slightly cooler than Thursday but still warm. Expect a high of 26°C with a humidex of 30. The UV index stays very high at 8, so precautions remain essential for outdoor activities.

Friday Night:
Skies will remain clear, with a refreshing overnight low of 12°C.

Saturday, July 26:
Expect a mix of sun and cloud with a 30% chance of showers. High of 26°C, with light winds expected to develop through the afternoon.

Saturday Night:
Cloudy periods will continue into the night with a 30% chance of showers, and a warm low of 17°C.

Sunday, July 27:
Skies are expected to clear, and temperatures will rise again to a high of 29°C, marking one of the hottest days of the week.

Sunday Night:
Cloudy periods with a 30% chance of showers continue, with a low of 16°C.

Wardrobe Recommendations

• Today: Light, breathable clothing will help with the heat and humidity. Consider sunglasses, a wide-brim hat, and sunscreen. Those sensitive to smoke may benefit from wearing a mask during outdoor exposure.

• Friday: Similar attire is recommended – lightweight fabrics, UV protection, and hydration are key.

• Saturday/Sunday: Prepare for potential rain with a light jacket or umbrella. Layers are helpful as conditions shift between sunshine and showers.

Weather Trivia

Did You Know?
Thunder Bay’s unique geography – nestled between the Nor’Wester Mountains and Lake Superior – can trap moisture and smoke, especially on calm days like today. This often leads to misty mornings and hazy afternoons during summer, especially when wildfire smoke drifts in from the west.