Thunder Bay weather for May 19, 2026: light rain, falling temperatures near 0°C this morning, overcast tonight, and a brighter Wednesday ahead
THUNDER BAY – WEATHER – Thunder Bay is starting Tuesday with a cold, damp spring morning as light rain moves through the city and temperatures hover just above freezing. The key feature today is an abnormal temperature trend, with the temperature falling toward 0°C this morning before rising again later in the day.
Today’s Weather Overview
Current Conditions
At 7:00 AM EDT, Thunder Bay was reporting light rain with a temperature of 3.3°C. The dew point was 2.6°C, and humidity was high at 95 percent, giving the morning a raw, wet feel.
Winds were from the north-northwest at 13 km/h, gusting to 28 km/h, and visibility was 8 km. Barometric pressure was 100.8 kPa and falling, pointing to unsettled weather continuing through the morning.
Forecast for Thunder Bay
Today
Rain is expected to end near noon, followed by cloudy skies and a 30 percent chance of showers. The temperature will fall to near 0°C this morning, then rise later in the day. The daytime high is near 6°C, though conditions will feel colder during the wet and windy morning period.
Tonight
Tonight will remain overcast, with a low of +1°C. While widespread frost is not the main story, sheltered and inland spots may feel close to freezing overnight.
Wednesday
Wednesday brings improving conditions. Skies will start cloudy, then become a mix of sun and cloud in the morning, with a high near 12°C. Wednesday night will be clear, with a low near +1°C.
Looking Ahead
Thursday looks like the best day of the workweek, with sunny skies and a high near 15°C. Friday also stays sunny during the day, with a high near 14°C, before shower chances return Friday night and continue at times through the weekend. The longer-range trend turns milder by Monday, with a high near 19°C possible.
Wardrobe Recommendations
A waterproof jacket and warm layers are the best choice for Tuesday morning. Gloves may be useful early in the day, especially with the cool north-northwest wind. By Wednesday and Thursday, lighter spring layers should work well, but mornings will still be chilly.
Weather Trivia
Thunder Bay’s spring weather is strongly influenced by Lake Superior. When winds come off or near the lake, temperatures can stay much cooler than inland areas, especially in May when the lake water remains cold.
