Environment Canada issued a Special Weather Statement at 4:48 AM EDT on May 23, 2026, warning of heavy rain with 30 to 50 mm possible across the Greater Toronto Area, including Ajax and the Durham Region.
The low-pressure system kept Saturday cool and wet in Ajax, with a high near 13 C and a low around 10 C. Rain that fell through the day was expected to change to drizzle as the system moved east, and Environment Canada forecast a warm-up to about 21 C on Sunday as conditions began to improve.
By Monday, May 25, 2026, conditions had cleared. Environment Canada observations for Ajax showed sunny skies at 19.6 C with wind from the WNW at 15 km/h and no weather alerts in effect for the Pickering-Oshawa-Southern Durham Region. The 7-day forecast calls for a pleasant workweek ahead, with highs rising to about 24 to 26 C by Tuesday and Wednesday, highs near 23 C on Thursday and Friday, and a slight cooling to about 20 C for the weekend of May 30-31.
The Toronto and Region Conservation Authority noted that while flooding was not expected at local watersheds, water levels and flow speeds in rivers and streams will rise. The authority warned residents to avoid riverbanks and shorelines, especially with children and pets. With late-May normals around a 21 C high and 10 C low, the midweek warmth will sit a few degrees above the seasonal average.
