Ajax, Ontario, is enjoying a hot and sunny day on August 5, 2026, with temperatures reaching 29°C and a Humidex of 34, but residents should get outside quickly as showers are expected to return for the rest of the week.
Environment Canada shows the high today with a UV index of 9, which is classed as very high. Fog patches that were present in parts of the region this morning have lifted, leaving clear skies for the afternoon. No weather alerts are in place for Ajax or the rest of the Pickering-Oshawa Southern Durham Region right now.
The pattern will change Thursday, August 6, when a 40 percent chance of showers moves into the forecast. There is also a risk of a thunderstorm in the afternoon. The high on Thursday will be 28°C, with the Humidex getting up to 34 again.
Looking ahead to the weekend, Saturday will be cloudy with a 60 percent chance of showers and a high of 26°C. Sunday brings a break with sunny skies and a high of 27°C, but the unsettled weather returns on Monday under cloudy conditions and another 60 percent chance of showers, again reaching 26°C.
These temperatures are above the normal August high of 25°C, according to Environment Canada. The humidex values are also making it feel hotter than the actual temperature as part of a wider pattern of hot and humid air across southern Ontario that will fuel thunderstorm risks through Thursday.
