Thunder Bay, ON — Monday is starting mostly cloudy and cool, but the day should warm into a near-seasonal afternoon before showers and possible thunderstorms develop across the Lakehead region.
Environment Canada’s Monday forecast calls for a mix of sun and cloud, a 60 percent chance of showers this afternoon, and a risk of a thunderstorm. Winds will become west at 30 km/h gusting to 50, with a high of 22°C and a UV index of 7, or high. As of 7:00 AM EDT Monday, Thunder Bay Airport reported mostly cloudy skies and a temperature of 10.2°C with a dew point of 6.6°C and humidity at 78 percent. Visibility is excellent at 32 kilometres. Winds are light from the southwest at 9 km/h, while pressure is 100.7 kPa and falling, a sign that the atmosphere is becoming more unsettled.
This morning may feel cool, but the afternoon should improve with temperatures reaching 22°C. That is close to Thunder Bay’s mid-June normal high of 21°C, but the day will not be completely settled. Showers are likely enough to plan around, and the risk of a thunderstorm means outdoor plans should include a weather check before heading out. Tonight is expected to be partly cloudy with a 60 percent chance of showers early this evening and a continued risk of a thunderstorm. The overnight low should drop to around 8°C.
Today’s expected high of 22°C is close to normal for June 15, with Environment Canada listing Thunder Bay’s normal maximum at 21°C and normal minimum at 8°C.
There is no Thunder Bay-specific public weather warning currently listed, but the forecast does include a risk of thunderstorms this afternoon and early evening. Environment Canada’s alerts page remains the official place to monitor watches and warnings if storms strengthen. Looking ahead, Tuesday brings a mix of sun and cloud with a 30 percent chance of showers and a high of 19°C, while Wednesday should see increasing sunshine with a high near 23°C. Residents are encouraged to stay weather-aware and plan accordingly for the unsettled start to the work week.
Community members are encouraged to stay informed and share this information with friends and family. Following trusted local news sources helps ensure everyone stays up to date with events and announcements affecting Thunder Bay and Northwestern Ontario.
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📍 Source: NetNewsLedger · By: Staff · 🗓️ June 15, 2026 · 🏠 ThunderBay.Online
