Environment Canada is forecasting a sunny and warm stretch for Sidney, British Columbia, with daytime highs ranging from 23°C to 26°C throughout the week of August 17 to 21, 2026. The forecast, issued at 5:00 a.m. PDT on Monday, calls for mostly clear skies and light winds, though residents should expect hazy conditions at times.
Monday’s high is expected to reach 24°C with a humidex of 28, making it feel warmer. The UV index is forecast to be 6, which is considered high. On Tuesday, the temperature is expected to ease slightly to 23°C, with a UV index of 7, also considered high, prompting a reminder from Environment Canada to take sun safety precautions, especially during midday hours.
The warmest day of the week is likely Friday, when a mix of sun and cloud is expected along with a high of 26°C. This is slightly above the August normal high of 22°C for the Sidney area. Overnight lows are forecast to remain around seasonal values, offering some relief from the daytime heat.
Air quality in the region is currently rated as low risk, according to Environment Canada’s Air Quality Health Index, with values between 1 and 3 recorded at the nearest monitoring station in Victoria/Saanich. This means ideal conditions for outdoor activities, despite haze noted in the forecast. While smoky skies have affected other parts of British Columbia, Sidney is not expected to see significant air quality impacts this week.
Residents planning to spend time outside are advised to check the latest forecast and UV index before heading out. Environment Canada’s complete seven-day outlook for Sidney is available on the national weather website.
