a crazy forecast for the unofficial start of summer in Canada

From shorts to coats: crazy predictions for the unofficial start of summer in Canada

Welcome to the start of the May long weekend, commonly known as the unofficial kickoff to summer in Canada. The forecast for this weekend underscores the “unofficial” nature of this symbolic weekend, as the weather will look more like the start of spring than a taste of summer.

TO HAVE: Three things you’ll want to keep in mind this long weekend

While a broad trough engulfing the country brings below-season temperatures to most areas, the long weekend won’t be completely canceled for some communities. Summer heat and humidity will greet some regions, with daytime highs sometimes reaching 30°C.

Here’s a closer look at specific weather details as you prepare to plan for the weekend ahead.


Temperatures will continue to tend to be cooler over the long weekend in British Columbia, particularly in inland areas of the province. Although we won’t see any major systems beginning the weekend, some instability may contribute to erratic showers or thunderstorms, particularly across the interior.

The risk of wet weather will return on Sunday and Monday as a Pacific front approaches the central and northern coast.

picture - 2022-05-18T064049.927

picture – 2022-05-18T064049.927


To say the Prairie weather is “changeable” was an understatement this week. Warmer temperatures and thunderstorms turned into a below-season cooling with late-season snowfall for western parts of the region.

PROVIDE: Warnings issued for up to 20cm of spring snow over parts of Alberta

These below-season temperatures will persist through the first half of the weekend before moderating somewhat in time for Sunday and Monday.

The system that brought unwanted snow and much-needed rain to Alberta will continue across the southern Prairies Friday, with showers continuing Saturday. Additional rains will fall on waterlogged parts of southern Manitoba that certainly do not need more precipitation.

Scattered rain showers will develop in northern areas on Sunday, with more widespread rain and thunderstorms across Alberta on Monday, especially near and north of the Yellowhead Highway.

picture - 2022-05-18T064114.668

picture – 2022-05-18T064114.668


Warm, humid air will allow daytime temperatures to push into the upper 20s and even approach 30C for parts of southern Ontario and Quebec on Friday.

The soup diet will provide plenty of fuel for strong to severe thunderstorms to bubble up, which is when they can start. Many areas will escape thunderstorms on Friday for lack of an atmospheric trigger.

The best chance of thunderstorms will occur around Lake Huron, Georgian Bay and parts of cottage country, where a cold front will begin to enter the unstable air mass. Storms here could produce large hail and damaging winds.

picture - 2022-05-18T064153.514

picture – 2022-05-18T064153.514

The threat of thunderstorms will continue eastward along the cold front on Saturday. We will see a considerable risk of thunderstorms from Windsor to Quebec, with severe thunderstorms possible along the Highway 401 corridor.

Temperatures will drop sharply behind the cold front. High single-digit temperatures will be widespread across northern Ontario, with widespread frosts and frost expected. There could even be signs of frost northwest of the GTA by Monday morning.


Although there will be periods of unsettled weather over the long weekend, a ridge of high pressure over the Atlantic will form, forcing precipitation north of the region and bringing some summer heat to inland areas.

picture - 2022-05-18T064336.524

picture – 2022-05-18T064336.524

Temperatures in the mid to upper twenties are expected for a day or two for the interior regions of the four Atlantic provinces. However, a strong southwesterly wind crossing the cold ocean waters will sabotage the warming of most south and west facing coastal areas. These areas will be mostly cloudy and much cooler with a chance of drizzle and fog. Meanwhile, much of central and northern New Brunswick will hit the upper 20s and lower 30s on Sunday.

A cold front will move across the Maritimes on Sunday evening, with a chance of rain showers and thunderstorms followed by much cooler weather for Monday. However, for southern coastal areas that lack heat on Sunday, Monday will actually deliver warmer temperatures due to the northwesterly wind, which will blow in from the land instead of the ocean.

Be sure to check the latest weather details as the long weekend approaches.