Residents in Brockville can expect a warm, sunny day on Monday, April 27, 2026, as temperatures climb to 5 degrees above the seasonal average. According to Environment Canada, the daily high will reach 20°C, marking a pleasant change from the usual late-April highs of 15°C.
While the weather is ideal for outdoor activities, the sunshine comes with a high UV index of 7. Environment and Climate Change Canada recommends that anyone spending time outside near midday take precautions, such as wearing a hat that covers the face and ears, using tight-woven clothing, and applying sunscreen to exposed skin.
This warm stretch will be short-lived, as changing conditions are expected to move into the 1000 Islands region by Tuesday, April 28. Clouds are expected to increase late Tuesday morning, followed by a transition into showers. By Wednesday, April 29, the region will see cooler temperatures with a high of 12°C and a continued 60 percent chance of rain.
