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Southern Ontario weather outlook: Fall-like week ahead

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Dr. Doug Gillham
Meteorologist, PhD

Friday, July 11, 2014, 3:35 PM -

So far our summer weekends have featured some great weather and this weekend will continue that trend. However, we will have a couple of interruptions as a period of rain with scattered thunderstorms will cross much of southern Ontario Saturday night and Sunday morning, and scattered thunderstorms will impact a few areas later on Sunday.

Saturday will be the nicest day of the weekend with lots of sunshine and highs in the upper twenties. Clouds will begin to increase late in the day, and an isolated shower or thunderstorm is possible, but most of the GTA and cottage country will not see any rain until Saturday night.

Widespread rain and a few thunderstorms will spread across much of southern Ontario Saturday night into Sunday morning. However, by Sunday afternoon southern Ontario will be mostly rain-free as some sunshine mixes in with the clouds. Our weather will be rather muggy as the humidex reaches the mid thirties.


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With the heat and humidity will come the threat for scattered showers and thunderstorms later Sunday afternoon and evening, but many places will not see these storms.

So, the bottom line for this weekend is that you shouldn’t need to water your lawn, but there will still be plenty of opportunity to enjoy being outside, especially on Saturday.

As we go into next week, we will transition to a more fall-like weather pattern which will bring several days with well below seasonal temperatures. During this transition, we will have the threat for occasional showers and thunderstorms Monday and Tuesday, but neither day will be washout. High temperatures in the GTA for Tuesday through Thursday will be near 20ºC while highs in cottage country will only be in the upper teens.

Taking a look further into the long range, it appears that we will have another well-timed warm-up as temperatures recover to near seasonal by next weekend. It is still early, but it also looks like most of next weekend will be dry with lots of sunshine. While we have very little hot weather in the long range forecast, there will still be plenty of pleasant summer weather to enjoy during the weeks ahead.

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