Residents in Sarnia, Ontario can expect a break from wet weather as any lingering early afternoon showers taper off and mostly dry conditions settle in for much of the week. According to Environment Canada, conditions will clear this afternoon, setting up a predominantly dry and increasingly warm run through Sunday, June 28, 2026.
As of 2:00 p.m. Monday at Sarnia Chris Hadfield Airport, skies were already sunny with a temperature of 19°C and north-northeast winds at 18 km/h. The forecast calls for a high of 22°C today, climbing to 27°C by Sunday. Tuesday is expected to be sunny with a high of 22°C, while Wednesday will see a mix of sun and cloud with a 30 percent chance of showers and a warmer 26°C.
A brief interruption is possible Thursday afternoon, June 25, when there is a 60 percent chance of showers or thunderstorms, with a high near 25°C. After that, a mix of sun and cloud is expected through the weekend. No weather alerts are currently in effect for the Sarnia area.
Environment Canada has issued a UV index of 8, or very high, for both Monday and Tuesday. Health officials recommend limiting time in the sun between 11 a.m. and 3 p.m. and applying SPF 30 or higher sunscreen for anyone spending time outdoors. Typical late June highs in Sarnia are around 26°C, with overnight lows near 14°C, making this week’s temperatures close to seasonal norms.
