Ottawa residents better keep the fans running and the water bottles full, because this week's heat is no joke. According to CTV News, the humidex is expected to make it feel like 37 degrees Celsius today, with an even more intense 43 degrees on the way tomorrow.
What's Driving the Heat
A hot, humid air mass has settled over the region, pushing both temperatures and humidity levels sharply upward. While the actual air temperature won't hit those numbers outright, the humidex factors in humidity to reflect what the weather actually feels like on your skin — and 43 is squarely in the range where Environment Canada typically issues heat warnings.
This kind of stretch isn't unheard of for an Ottawa summer, but it's still enough to catch people off guard, especially if it arrives after a run of milder days. The combination of heat and stickiness can make outdoor activity feel exhausting fast, even for people used to Ottawa's swampy July air.
Staying Safe in the Heat
With humidex values reaching into the low-to-mid 40s, health officials generally recommend Ottawans take the heat seriously. That means staying hydrated, avoiding strenuous outdoor activity during peak afternoon hours, seeking out air-conditioned spaces, and checking in on older neighbours, young kids, and pets who are more vulnerable to heat stress.
Ottawa Public Health typically opens cooling centres, and splash pads see heavier traffic during stretches like this. Local pools, the Rideau Canal's shaded pathways, and air-conditioned spots like the Ottawa Public Library branches can offer some relief if home isn't cool enough.
What It Means for Your Day
If you're planning anything outdoors in Ottawa over the next couple of days — a run along the Rideau River, a patio lunch downtown, or an afternoon at the beach in Britannia — it might be worth shifting those plans to the morning or evening when the heat is less intense. Construction crews, landscapers, and anyone else working outside should be especially cautious, taking frequent breaks and drinking water regularly.
Ottawa's weather can swing dramatically from oppressive humidity to crisp, dry air within days, so this heat spike, while intense, likely won't stick around forever. Still, with humidex values this high, it's the kind of stretch where a little extra caution goes a long way.
Source: CTV News
