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Hourly Forecast - Port Perry

HEAT WARNING

A prolonged heat event will begin today. Dangerously hot and humid conditions are expected through most of the week. Daytime highs through much of the week are expected to be 30 to 35 degrees Celsius with humidex values of 40 to 45. There will be little relief through the overnight as lows are expected to be 20 to 23 degrees Celsius with humidex values of 26 to 30. Temperatures and humidex values may be several degrees cooler near the shores of the Great Lakes. Hot and humid air can also bring deteriorating air quality and can result in the Air Quality Health Index approaching the high risk category. Extreme heat can affect everyone's health. The health risks are greater for older adults, infants and young children, pregnant people, people with physical and/or mental illnesses, and people with disabilities or mobility issues. Never leave people, particularly children, or pets inside a parked vehicle. Watch for the effects of heat illness: swelling, rash, cramps, fainting, heat exhaustion, heat stroke and the worsening of some health conditions. Heat stroke is a medical emergency! Call 911 or your local emergency number immediately if you or someone you are caring for has a high body temperature and are confused, has stopped sweating or becomes unconscious. While waiting for help, cool the person right away: move them to a cool place, apply cold water to large areas of the skin and fan the person as much as possible. Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to ONstorm@ec.gc.ca or tweet reports using #ONStorm.

In effect for:
  • York - Durham
Date/Time
(EDT)
Temp.
(°C)
Weather ConditionsLikelihood of precip (%) Wind
(km/h)
Humidex
17 June 2024
09:00 23 A mix of sun and cloud

A mix of sun and cloud

20S 10
28
10:00 24 A mix of sun and cloud

A mix of sun and cloud

20VR 5
29
11:00 25 A mix of sun and cloud

A mix of sun and cloud

20S 10
31
12:00 27 A mix of sun and cloud

A mix of sun and cloud

20S 20
34
13:00 28 A mix of sun and cloud

A mix of sun and cloud

20S 20
35
14:00 30 Chance of showers. Risk of thunderstorms

Chance of showers. Risk of thunderstorms

60S 20
38
15:00 30 Chance of showers. Risk of thunderstorms

Chance of showers. Risk of thunderstorms

60SW 20
gusts 40
38
16:00 31 Chance of showers. Risk of thunderstorms

Chance of showers. Risk of thunderstorms

60SW 20
gusts 40
39
17:00 31 Chance of showers. Risk of thunderstorms

Chance of showers. Risk of thunderstorms

60SW 20
39
18:00 30 Chance of showers. Risk of thunderstorms

Chance of showers. Risk of thunderstorms

30SW 10
38
19:00 30 Chance of showers. Risk of thunderstorms

Chance of showers. Risk of thunderstorms

30S 10
38
20:00 29 Chance of showers. Risk of thunderstorms

Chance of showers. Risk of thunderstorms

30S 10
37
21:00 28 Chance of showers. Risk of thunderstorms

Chance of showers. Risk of thunderstorms

30S 10
36
22:00 26 Chance of showers. Risk of thunderstorms

Chance of showers. Risk of thunderstorms

30S 10
33
23:00 25 Chance of showers. Risk of thunderstorms

Chance of showers. Risk of thunderstorms

30S 10
32
18 June 2024
00:00 24 Chance of showers. Risk of thunderstorms

Chance of showers. Risk of thunderstorms

30S 10
31
01:00 22 Chance of showers. Risk of thunderstorms

Chance of showers. Risk of thunderstorms

30S 10
29
02:00 21 Chance of showers. Risk of thunderstorms

Chance of showers. Risk of thunderstorms

30S 10
28
03:00 21 Chance of showers. Risk of thunderstorms

Chance of showers. Risk of thunderstorms

30S 10
28
04:00 20 Chance of showers. Risk of thunderstorms

Chance of showers. Risk of thunderstorms

30S 10
26
05:00 20 Chance of showers. Risk of thunderstorms

Chance of showers. Risk of thunderstorms

30S 10
26
06:00 21 Chance of showers. Risk of thunderstorms

Chance of showers. Risk of thunderstorms

30S 10
28
07:00 21 A mix of sun and cloud

A mix of sun and cloud

20SW 10
29
08:00 22 A mix of sun and cloud

A mix of sun and cloud

20SW 10
30

* Value not significant

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