Hot weather is expected across most of Ontario from Friday through Sunday, Environment Canada reports.

Toronto and Ottawa will see daytime highs near 32 C each day, with nighttime lows not falling under 19 C.

Humidity will push humidex values to around 38 to 40 during afternoon hours, officials say.

Heat alerts continue in effect at the "excessive heat" level, especially for vulnerable populations.

Residents are encouraged to stay hydrated and avoid outdoor activity during midday heat.

Officials also recommend checking on senior relatives frequently.

Public cooling centres are open throughout for those in need.

Travelers should keep water bottles and wear breathable clothing.