3:04 p.m. EDT Saturday 22 August 2026

Locally significant rainfall possible this weekend.

What:
Local rainfall amounts exceeding 50 mm.
Rainfall rates up to 40 mm in an hour.

When:
Today through Sunday morning.

Additional information:
Showers and thunderstorms over parts of northeastern and southwestern Ontario will continue to develop and move to the east through the day. Given the potential for slow-moving showers and thunderstorms and for some areas to receive multiple rounds of precipitation, local amounts exceeding 50 mm are possible.

Note that rainfall amounts will be highly variable across the region and not all areas will receive this much rain. There remains considerable uncertainty as to exactly which areas will receive the highest rainfall amounts.

Additional showers are expected through Sunday, especially to the east of Lake Huron and Georgian Bay and over northeastern Ontario.

Water may pool on roads and in low-lying areas.

Don't drive through flooded roadways.

Avoid low-lying areas. Watch for washouts near rivers, creeks and culverts.

For information concerning flooding, please consult your local Conservation Authority or Ontario Ministry of Natural Resources office. Visit https://www.ontario.ca/page/floods for the latest details.

Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to ONstorm@ec.gc.ca or post reports on social media using #ONStorm.

In effect for:

• Pickering - Oshawa - Southern Durham Region