Island St. Thomas
No need to modify usual outdoor activities unless you experience symptoms such as coughing or throat irritation.
Island St. Thomas Live Precipitation Radar
Full Screen ViewIsland St. Thomas Live Doppler RadarMSC Dual-Pol
Island St. Thomas, ON • Lat: 47.38° N, Lon: 77.30° W • Sweep 10m
Island St. Thomas 30-Year Weather History & Monthly Averages
Explore month-by-month temperatures, annual snowfall in cm, rainy days, and historical record highs and lows.
Island St. Thomas Air Quality & Wildfire Smoke Report
Detailed Canadian AQHI breakdown, fine particulate matter (PM2.5), ground-level ozone, and health guidance.
Frequently Asked Questions About Weather in Island St. Thomas, ON
What is the current temperature and conditions in Island St. Thomas?
As of today, the temperature in Island St. Thomas is 19.4°C with mainly sunny. The apparent temperature (feels like) is 17.8°C with relative humidity at 51%.
How does Wind Chill and Humidex affect Island St. Thomas?
During warmer conditions, the Canadian Humidex indicates comfort levels. The current Humidex is 19 (Comfortable).
What is the Air Quality Health Index (AQHI) for Island St. Thomas?
The current AQHI for Island St. Thomas is 4 (Moderate Risk). It is calculated based on ground-level ozone, fine particulate matter (PM2.5), and nitrogen dioxide levels according to Health Canada standards.
Where does the meteorological data for Island St. Thomas come from?
Forecasts are generated using high-resolution Canadian Deterministic Prediction System (HRDPS 2.5km) and Global Environmental Multiscale (GEM) models alongside official Environment and Climate Change Canada Doppler radar feeds.