Thunder Bay is experiencing a stretch of unsettled early-June weather, with rain and thunderstorms likely before conditions improve for the weekend.
On Thursday, June 4, 2026, the region saw cool and damp conditions.
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Morning temperatures started at 10.8°C with 73 percent humidity and east-northeast winds at 11 km/h.
The daytime high is expected to reach 19°C under mainly cloudy skies. There is a 60 percent chance of showers and a risk of thunderstorms.
Friday, June 5, 2026, will bring a slight improvement. The forecast high is 23°C with a humidex of 25.
Conditions will feature a mix of sun and clouds, but a 40 percent chance of afternoon showers and thunderstorms remains.
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Overnight, the chance of rain drops to 30 percent.
Weekend Outlook
Conditions will stabilize over the weekend as clearer skies return. Saturday is expected to bring a mix of sun and clouds with a high of 21°C.
Sunday will see full sunshine and a high of 26°C, offering a pleasant end to the week.
The rapid weather shifts are driven by the temperature contrast between the cool waters of Lake Superior and warming inland areas.
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This setup keeps the waterfront cooler while introducing moisture and atmospheric instability across Thunder Bay.
