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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the True North Brief Weather Desk. Data from Environment and Climate Change Canada and other national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
Expect a daytime high near the value shown in the live forecast above, with a mix of sun and cloud and a 30 percent chance of afternoon showers. This pattern is typical for Barrie in early autumn, driven by a weak upper trough moving over Lake Simcoe.
What will the temperature and wind feel like today?
The live forecast above gives the official high and low. Winds will be light, from the southwest at 15–25 km/h, keeping the humidex negligible. Overnight, the temperature will drop to the low single digits with clearing skies, so a light jacket is advisable for any evening plans.
Will the weekend be wet or dry for Barrie?
Friday will bring increasing cloud and a 40 percent chance of showers as a Pacific front approaches. Saturday looks mainly dry with a high near 15°C, though Sunday may see a return to unsettled conditions. The best outdoor window is Saturday afternoon.
Will the lake-effect clouds affect Barrie visibility today?
Not significantly. Lake Simcoe can generate low cloud in late autumn, but today’s southwesterly flow keeps most lake-effect activity downwind near the Kawarthas. Visibility remains good, above 10 km.
Is Barrie expected to see frost this week?
Overnight lows Wednesday and Thursday may dip to 2–4°C in outlying areas, but the urban centre and lakeshore should stay above freezing. A frost advisory is unlikely for the immediate Barrie area.
How does today’s forecast compare to the seasonal average for Barrie?
The mid-September average high is 18°C. The live forecast above is slightly below that, which aligns with a cooler northwest flow. Precipitation is near normal for the date.
For conditions across the province, visit our Canada weather hub or check the latest weather warnings for Ontario. Compare Barrie’s forecast with Toronto Weather or Ottawa Weather.