LONDON, ONT. -- The summer heat drops off this weekend and the cooler, more comfortable air will have you grabbing for a light sweater in the evening.

A strong line of thunderstorms moved through the area Thursday morning, dropping a significant amount of rainfall.

Localized flooding caused the temporary closure of main road to Port Stanley beach. Water dissipated later in the morning as the sun came out, and the road was reopened.

A cold front is set to cross Thursday evening and is the leading edge of much cooler air mass.

The daytime highs over the weekend will average close to five degrees below normal. You will notice the change, with clouds moving in and a cool wind out of the northwest.

Temperatures are set to drop close to 20 C Friday and winds will be cool and strong. A mix of sun and cloud is on the way Friday afternoon. 

Expect some showers to move in Saturday. The greatest chance for rain will arrive Saturday afternoon in Midwestern Ontario and Saturday evening in London. The chance for rain will linger into early Sunday.

Strong high pressure builds for Monday and sunny skies return. That will be the best day to enjoy the outdoors over the long weekend.

If you like it on the warm side, temperatures are set to rebound early next week. Sunshine is in the forecast Monday through to Wednesday.