Extreme heat forecast for Wednesday, Thursday as humidex nears 40

Hot humid days are ahead this week, warns Environment Canada, as temperatures are forecast to reach between 30 and 33 C starting Wednesday afternoon.

The weather authority issued a heatwarning Tuesday, saying the humidity will make it feel even warmer. Humidex values are expected to reach 40.

Environment Canada also cautionedthere won't be much relief in the evenings; overnight lows will stay above 20 C.

"Extreme heat affects everyone," Environment Canada said in its weather warning, addingthe people at greatest risk during heat events are older adults, people with chronic illnesses, pregnant people and young children.

Anyone who works or exercises outside is also at risk of heat stroke or heat exhaustion.

WATCH| An ER physician talks aboutincreases in heat-related illness:

ER physician on increases in heat-related illness

3 years ago

Duration 2:26

Vancouver emergency room physician Dr. Daniel Kalla on the precautions, warning signs and potential remedies for heat-related illnesses as temperatures reach record highs, and how to cool down.

The hot, humid temperatures are expected to let up on Thursday evening; that could be even sooner for areas hit by regional showers or thunderstorms.

As of Tuesday, Environment Canada forecast highs of 25 C on Friday, 21 C on Saturday and 22 C on Sunday.

The cities and townships have cooling centres set up at the following locations:

Kitchener

• Bridgeport Community Centre at 20 Tyson Dr.
  • 8:30 a.m. to 4:30 p.m. Monday to Friday
• Centreville Chicopee Community Centre at141 Morgan Ave.
  • 8:30 a.m. to 4:30 p.m. Monday to Friday
• Chandler Mowat Community Centreat222 Chandler Dr.
  • 8:30 a.m. to 4:30 p.m. Monday to Friday
• Country Hills Community Centre at100 Rittenhouse Rd.
  • 8:30 a.m. to 4:30 p.m. Monday to Friday
• Doon Pioneer Park Community Centre at 150 Pioneer Dr.
  • 8:30 a.m. to 4:30 p.m. Monday to Friday
• Forest Heights Community Centre at1700 Queen's Blvd.
  • 8:30 a.m. to 4:30 p.m. Monday to Friday
• Ken Seiling Waterloo Region Museum at10 Huron Rd.
  • 12 p.m. to4 p.m. Thursday and Friday, 11 a.m. to 4 p.m. Saturday and Sunday
• Kingsdale Community Centre at72 Wilson Ave.
  • 8:30 a.m. to 4:30 p.m. Monday to Friday
• Kitchener Downtown Community Health Centre at44 Francis St. S
  • 9 a.m. to 5 p.m.Monday to Thursday,8 a.m. to 4 p.m.Friday
• Region of Waterloo Headquarters at 150 Frederick St.
  • 8:30 a.m. to 4:30 p.m. Monday to Friday
• Stanley Park Community Centre at505 Franklin St.N.
  • 8:30 a.m. to 4:30 p.m. Monday to Friday
• Victoria Hills Community Centre at10 Chopin Dr.
  • 8:30 a.m. to 4:30 p.m. Monday to Friday

Cambridge

• Region of Waterloo building at150 Main St.
  • 8:30 a.m. to 4:30 p.m. Monday to Friday.
  • 9:00 a.m. to 12:00 p.m. Saturday and Sunday.

Waterloo

• Region of Waterloo building at99 Regina St. S.
  • 8:30 a.m. to 4:30 p.m. Monday to Friday
• Waterloo City Hall at100 Regina St. S.
  • 7 a.m. to 6 p.m. Monday to Friday
• RIM Park Manulife Sportsplexat2001 University AveE.
  • 7 a.m. to 11 p.m. every day
• Waterloo Memorial Recreation Complex at101 Father David Bauer Dr.
  • 7 a.m. to 11 p.m. every day
• Albert McCormick Community Centre at500 Parkside Dr.
  • 7 a.m. to 11 p.m. every day
• Moses Springer Community Centre at150 Lincoln Rd.
  • 8 a.m. to 10 p.m. every day

North Dumfries

• North Dumfries Community Complex at2958 Greenfield Rd. in Ayr.
  • 8:30 a.m. to 4:30 p.m. Monday to Friday
• WaterlooRegional Library at137 Stanley St. in Ayr.
  • 10 a.m. to 8 p.m. Tuesday and Wednesday, 10 a.m. to 4 p.m. Thursday,2 to6 p.m. Friday,10 a.m. to 2 p.m. Saturday

Wellesley

• WaterlooRegional Library at 5279 Ament Ln,Linwood.
  • 4 to 8 p.m. Tuesday and Wednesday, 10 a.m. to 2 p.m. Thursday
• WaterlooRegional Library at 3605 Lobsinger Ln,St. Clement.
  • 10 a.m. to 2 p.m. Tuesday,4 to 8 p.m. Wednesday,2 to 6 p.m. Friday
• Waterloo Regional Library at1137 Henry St. in Wellesley.
  • 1 to 8 p.m. Tuesday, 4 to 8 p.m. Wednesday,10 a.m. to 5 p.m. Thursday, 10 a.m. to 2 p.m. Saturday

Wilmot

• WaterlooRegional Library at115 Snyder's Rd. E.,Baden.
  • 10 a.m. to 5 p.m.Monday and Thursday, 1 to 8 p.m. Tuesday and Wednesday,10 a.m. to 2 p.m. Saturday
• WaterlooRegional Library at1176 Queen St., New Dundee.
  • 4 to 8 p.m. Tuesday and Thursday,10 a.m. to 2 p.m. Wednesday and Saturday.
• WaterlooRegional Library at145 Huron St., New Hamburg.
  • 10 a.m. to 5 p.m. Monday and Thursday,1 to 8 p.m. Tuesday and Wednesday,2 to 6 p.m. Friday,10 a.m. to 2 p.m. Saturday.
• Township of Wilmot Administration Complex at60 Snyders Rd.W., Baden.
  • 8:30 a.m. to 4:30 p.m. Monday to Friday.

Woolwich

• WaterlooRegional Library at65 Arthur St.S., Elmira.
  • 10 a.m. to 5 p.m. Monday and Thursday,1 to 8 p.m. Tuesday and Wednesday,2 to 6 p.m. Friday, 10 a.m. to 2 p.m. Saturday.
• WaterlooRegional Library at29 Queensway Dr., St. Jacobs.
  • 3 to 7 p.m. Tuesday and Wednesday, 10 a.m. to 2 p.m. Thursday.

Are you seriously hot?

Health columnist Dr. Peter Lin explains the science ofkeeping cool when temperatures get dangerous.