Burlington residents can expect a hot and sunny start to the week, but should also keep an umbrella handy as showers are likely by Thursday. Environment Canada is forecasting a high of 29°C for Wednesday, August 5, 2026, with a humidex making it feel more like 34°C.
The UV index is expected to reach 8, which is considered very high. Residents are advised to limit time in the sun, especially between 11 a.m. and 3 p.m., wear sunscreen, and stay in the shade when possible.
Thursday will be similarly hot with a high of 28°C and a humidex of 34, but there is a 40% chance of showers and a risk of a thunderstorm. The UV index is forecast to hit 9 on Thursday, falling into the very high category. Showers remain possible through the weekend, with a 40% chance on Friday, 60% on Saturday and Monday, and sunny skies returning on Sunday with a high of 28°C.
Lake Ontario water temperatures near Burlington are currently between 18°C and 21°C, making it a good time for a swim. August is typically the warmest month for the lake, with water temperatures averaging around 22°C.
Environment Canada says no weather alerts are in effect for Burlington at this time. Sunrise on Wednesday is at 6:13 a.m. and sunset at 8:37 p.m., giving residents over 14 hours of daylight to enjoy.
