Oshawa, Ontario, is in for a wet and unsettled start to the week, with Environment Canada forecasting showers and a risk of thunderstorms through Wednesday before clearing skies arrive just in time for the long weekend.
As of 11:00 a.m. on Tuesday, July 28, conditions at Oshawa Executive Airport were cloudy at 22.1°C with humidity at 88 per cent and a light south wind at 5 km/h. No weather alerts are in effect for the area, but that could change as a slow-moving low-pressure system from the U.S. Midwest continues to influence the region.
Tuesday afternoon brings a 60 per cent chance of showers late in the day with the risk of a thunderstorm. The high is expected to reach 26°C, feeling closer to 32 with the humidex. The UV index will be 5, or moderate. Tonight, that shower and thunderstorm risk holds at 60 per cent, with north winds picking up to 30 km/h gusting to 50 km/h, and a low of 17°C. Oshawa and Pickering could see up to 30 mm of additional rain from any heavy downpours.
Wednesday, July 29, stays unsettled with a continued 60 per cent chance of showers and thunderstorm risk. The high will again be 26°C under a mix of sun and cloud, with the humidex at 31. North winds will ease to 20 km/h. The UV index climbs to 8, or very high, so those venturing out should protect their skin. Wednesday night will begin clearing with a low of 17°C.
The pattern finally breaks Thursday, when sunny conditions return and the temperature rises to 28°C. Thursday night will be clear with a low of 13°C. Friday will be even warmer, with sunny skies and a high of 29°C — perfect timing for anyone planning outdoor activities for the Civic Holiday weekend.
While flooding is a greater concern for areas east of Lake Simcoe and Georgian Bay toward the Ottawa Valley — where more than 75 mm of rain could fall by Thursday morning — Oshawa could still see localized ponding on roads and in low-lying areas. Residents are advised to monitor forecasts and have rain gear handy for the next couple of days.
