Heat Wave in Guelph: Today’s Temperatures Hit 33 °C with Humidex at 44 °C

A significant heat wave is underway in Guelph and surrounding areas. Environment Canada has issued a Heat Warning effective from this morning until early Wednesday, with daytime highs reaching 30–36 °C and humidex (feels-like) readings soaring between 40–45 °C .

Conditions to Expect Today

• Afternoon high: 33 °C, but with high humidity it feels more like 44 °C outside.
• Evening will remain hot, with overnight temperatures not dipping below 21–25 °C, offering little relief .

Health & Safety Precautions

1. Stay cool and hydrated: Drink water often—don’t wait until you’re thirsty.
2. Avoid peak sun hours: Schedule outdoor tasks for early morning or evening.
3. Check on vulnerable individuals: Frequent wellness checks on older adults, infants, and those with health issues.
4. Know heat illness warning signs: Heat exhaustion symptoms include headache, nausea, dizziness, fatigue, thirst and dark urine. At the first sign, stop activity and sip water.
5. Emergency protocols: Signs of heat stroke (red-hot skin, confusion, fainting) require immediate 9‑1‑1 attention. Cool the person while waiting by moving to shade, removing clothing, and applying water or ice packs .
6. Make your home safer: Close blinds, use fans or AC, and retreat to air‑conditioned public spots like libraries.

Why the Heat Is Dangerous

• Sustained extreme heat combined with high humidity reduces the body’s ability to cool itself.
• Overnight warmth prevents recovery, increasing the risk of cumulative strain.
• Those with cardiovascular issues, respiratory conditions, and seniors are particularly at risk.

Community & Local Resources

• Cooling centres: The Guelph Public Library and several community centres are open with AC—check local listings for times and locations.
• Health Canada advice: Full guidelines on heat protection, risk groups, and behaviour tips are available .
• Stay alert: Keep an eye on heat warnings and forecasts from Environment Canada and local public health alerts.