Ajax residents can expect a warm and showery week as summer gives way to fall, with a Special Weather Statement in effect for Pickering–Oshawa–Southern Durham Region. The statement warns of showers and embedded thunderstorms through Monday night into Tuesday morning, with local rainfall amounts of 20 to 40 mm, possibly exceeding 40 mm.
As of late Monday afternoon, skies over Ajax were overcast with a temperature of 19.8°C and humidity at 100%, according to Environment Canada. The best chance of heavy rain arrives Monday night, with a 90% probability of precipitation and 15-20 mm expected.
Tuesday will feel more like midsummer, with a forecast high of 28°C and a humidex value of 36, making it feel muggy and uncomfortable outdoors. There is a 30% chance of showers and a risk of a thunderstorm. Wednesday’s high reaches 27°C, and temperatures ease into the 23-25°C range by Friday through the weekend. The chance of showers returns Wednesday night into Thursday morning, with a 60% probability of rain.
The Weather Network notes that while meteorological summer ends on August 31, warmer-than-normal temperatures are expected for the first week of September, with moisture from the Gulf of Mexico fuelling a multi-day thunderstorm threat. Lake Ontario water temperatures remain around 20-21°C, adding humidity along the shoreline.
No heat warnings are currently in effect for Ajax, but residents should be prepared for pooling water on roads and in low-lying areas during heavy downpours. The normal high for early September in Ajax is 23°C, with a low of 12°C.
