Toronto will see widespread smoke and rising heat on Wednesday, with a daytime high forecast near 33 °C and a humidex pushing toward 36, according to Environment Canada–based data.
Key elements of Wednesday's outlook
Current readings showed temperatures in the mid‑20s early Wednesday with visibility reduced by smoke and a northwest wind around 20 km/h. The hourly forecast indicates further warming through the morning and into the afternoon before a gradual easing in the evening.
| Time | Temperature |
|---|---|
| 9 a.m. | 27 °C |
| 12 p.m. | 31 °C |
| 2 p.m. | 33 °C |
| 5 p.m. | 31 °C |
| 8 p.m. | 27 °C |
The forecast also calls for a very high UV index of 8 and a humidex near 36 at the peak of the day, raising the potential for heat‑related discomfort.
Health and safety guidance
- People at higher risk — including older adults, infants, pregnant people and those with respiratory or cardiovascular conditions — should reduce time spent outdoors while smoke is present.
- Limit strenuous activity during the warmest hours and seek shaded or air‑conditioned locations when possible.
- Use UV protection: broad‑spectrum sunscreen, hats and sunglasses during outdoor exposure.
Winds are expected to remain from the northwest near 20 km/h through the afternoon before becoming lighter in the evening. The nightly low is forecast near 20 °C, with smoke persisting into the overnight period.
Looking ahead, Thursday is forecast to be mainly sunny with a high near 31 °C and humidex values still elevated. There is a chance of showers later in the week, with cooler readings expected by Tuesday.
Monitor updates from Environment Canada and local air‑quality advisories for changes to smoke concentrations and any health‑related warnings.
