The heat is on.

Heat warnings have been issued for Hamilton and Halton Region Tuesday and Wednesday.

In separate news releases the municipalities say the "heat events" will last through Wednesday with daytime temperatures reaching as high as 31 C. Overnight temperatures aren't expected to be much better, remaining over 20 C each night.

By Thursday it's expected to get cooler with the temperature slipping to 27 C.

"Anyone can be affected by extreme heat-related weather conditions. Those especially at risk include: older adults (over the age of 65), infants and young children, people who work and exercise in the heat, people without adequate housing and those without air conditioning," Halton advises. "People who have breathing difficulties, heart problems, kidney problems or take heat-sensitive medications are also especially at risk of preventable heat illness."

Symptoms of heat-related problems include rapid breathing, headache, confusion, weakness, fainting, heavy sweating, cold, pale and clammy skin; weak pulse and vomiting.

If any of these signs appears, call 911 or seek medical attention right away.

For more information on the health effects of extreme heat check

In Hamilton the city and participating community agencies are responding with a series of "cool places" identified by "Cool Down Here" signs at their entrances. City-operated outdoor pools will also have extended operating hours. Centres include malls, public recreation centres, public libraries, and other city run air-conditioned facilities.

Details in Hamilton are available at hamilton.ca/heat or by calling 546-CITY (2489) Monday to Friday 8:30 a.m. to 4:30 p.m. In Halton at halton.ca/heat or by calling 311.

Hamilton's Medical Officer of Health offers some hints for reducing the risk of heat-related illness:

• Drink plenty of water and cut down on alcohol and caffeinated beverages;

• Wear lightweight, loose-fitting, light coloured clothing plus a hat and sunscreen;

• Limit physical activities or reschedule them for dusk or dawn. If that's your choice, protect yourself with insect repellent as mosquitoes are more active at such times;

• Take a cool bath or shower;

• Keep your living space cool by closing your blinds or curtains;

• Never leave children or pets alone in closed vehicles where temperatures can become life threatening within minutes;

• Check on your neighbours and family.

For more information on how heat affects human health, see Health Canada's website at:

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Weather and heat information are available on local radio and television stations and the Environment Canada Weather Conditions and Forecast. For the Air Quality Health Index and smog and air health information, visit Air Quality Ontario.