What is the air quality in St. Thomas today?

The current Air Quality Index (AQI) in St. Thomas is 27 (Good). PM2.5 concentration is 6.47 µg/m³.

What is the temperature in St. Thomas right now?

The current temperature in St. Thomas is 6.5°C (feels like 2.0°C). Humidity is 73.1% and wind speed is 29.4 km/h.

Is it safe to go outside in St. Thomas?

Air quality is satisfactory. Enjoy outdoor activities. The UV Index is 0.0 (Low).

Air Quality in St. Thomas, Canada

Cloudy

6.5°C · 73.1% humidity

6.5°

Feels 2.0°

Good

Air quality is satisfactory. Enjoy outdoor activities.

3 stations

Nearby Monitoring Stations

AQI Forecast

— 5pm

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27 8pm

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— 11pm

—

— 2am

—

— 5am

—

— 8am

—

— 11am

—

— 2pm

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Station readings

Air Quality Index Trend

48h · 2 stn

View full history →

St. Thomas's air quality is primarily affected by vehicle emissions and industrial activity. Seasonal wildfire smoke and weather patterns can cause periodic air quality deterioration.

73.1%

Humidity

29.4 km/h

Wind ESE

1027.8 hPa

Pressure

0.0

UV Low

GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲

6.47 µg/m³

PM10

27.4 µg/m³

050100150200300500

What is the weather forecast for St. Thomas?

Temperature & Precipitation

PM2.5 Trend

48h · 2 stations

PM2.56.47 µg/m³ ✓ WHO

Good

PM1027.4 µg/m³

Good

UV INDEX0.0

Low

Station readings (3 stations within 25 km)

6.47

Median

6.4

Average

5.8

Low

7.2

High

PM2.5 µg/m³ · Model: 13.5 · Bias: +7.0

What is the 7-day forecast for St. Thomas?

10-21

20.4° 6.5°

10-22

15.8° 5.4°

10-23

15.1° 2.4°

0.44 mm

10-24

17.0° 4.8°

0.06 mm

10-25

12.8° 5.1°

0.25 mm

10-26

10.8° 4.8°

1.19 mm

10-27

8.9° 3.7°

0.19 mm

Both models agree Avg diff: 3.9°C

Where are air quality stations near St. Thomas?

Port Stanley, Ontario, Canada

11.4 km PM2.5: 7.2 µg/m³

Port Stanley, Ontario, Canada

11.4 km PM2.5: 6.5 µg/m³

Port Stanley, Ontario, Canada

11.4 km PM2.5: 7.2 µg/m³

London, Ontario, Canada

22.4 km PM2.5: 7.0 µg/m³

London, Ontario, Canada

22.4 km PM2.5: 6.2 µg/m³

London, Ontario, Canada

22.4 km PM2.5: 6.2 µg/m³

London, Ontario, Canada

22.4 km PM2.5: 6.5 µg/m³

KomokaWeather

29.5 km 10.7°C 72.0% RH PM2.5: 0.4 µg/m³ PM10: 1.4 µg/m³

What cities are near St. Thomas?

26 London 28 Tillsonburg 42 Strathroy 28 Woodstock 44 Norfolk County 28 Stratford 25 Brant 25 Brantford 19 Forest Heights 20 Kitchener

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Data sources: AQI from ground-level monitoring stations via AQICN. Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-10-21T00:31 UTC.