An extended period of extreme heat is moving into the southwest with highs reaching 35 C and overnight lows near 16 C.

Environment and Climate Change Canada has issued a heat warning for the area due to the forecasted conditions beginning today and expected to last until early next week, cooling slightly overnight by the weekend.

Effects of heat illness include swelling, rash, cramps, fainting, heat exhaustion, heat stroke and the worsening of some health conditions. Watch for early signs of heat illness (feeling unwell, fatigue, thirst, headache) as these can rapidly evolve into life-threatening emergencies.

ECC advises residents to drink plenty of water regularly, even before feeling thirsty, to decrease risk of dehydration. Limit direct sun exposure, stay shaded when outside by wearing a wide-brimmed, breathable hat or an umbrella.

Never leave people, particularly children, or pets inside a parked vehicle.

Turn on air conditioning (if possible), block the sun by closing curtains or blinds, or relocate to a cooler location such as a basement or public cooling centre.

All workers should take regularly scheduled breaks in a cool or shaded space.

Heat warnings are issued when very high temperature or humidity conditions are expected to pose an elevated risk of heat illnesses, such as heat stroke or heat exhaustion.

Please call HealthLine 811 for advice on health risks, symptoms and precautions associated with heat.