What is the air quality in St. Thomas today?

The current Air Quality Index (AQI) in St. Thomas is 29 (Good). PM2.5 concentration is 6.9 µg/m³.

What is the temperature in St. Thomas right now?

The current temperature in St. Thomas is 18.3°C (feels like 18.3°C). Humidity is 52.5% and wind speed is 79.0 km/h.

Is it safe to go outside in St. Thomas?

Air quality is satisfactory. Enjoy outdoor activities. The UV Index is 17.4 (Extreme).

Air Quality in St. Thomas, Canada

Windy

18.3°C · 52.5% humidity

18.3°

Feels 18.3°

Good

Air quality is satisfactory. Enjoy outdoor activities.

2 stations

Nearby Monitoring Stations

AQI Forecast

24 11am

29 2pm

26 5pm

25 8pm

25 11pm

25 2am

24 5am

24 8am

Air Quality Index Trend

15h · 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.

52.5%

Humidity

79.0 km/h

Wind NW

1018.2 hPa

Pressure

17.4

UV Extreme

GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲

6.9 µg/m³

PM10

13.7 µg/m³

050100150200300500

What is the weather forecast for St. Thomas?

Temperature & Precipitation

PM2.5 Trend

15h · 2 stations

PM2.56.9 µg/m³ ✓ WHO

Good

PM1013.7 µg/m³

Good

UV INDEX17.4

Extreme

Station readings (2 stations within 25 km)

6.9

Median

6.75

Average

6.5

Low

7.0

High

PM2.5 µg/m³ · Model: 5.8 · Bias: -1.1

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

05-30

18.3° 8.7°

1.38 mm

05-31

24.5° 7.9°

06-01

25.1° 14.9°

0.06 mm

06-02

19.3° 11.1°

0.06 mm

06-03

24.9° 17.9°

2.19 mm

06-04

22.5° 12.8°

06-05

23.0° 8.5°

3.19 mm

Both models agree Avg diff: 5.1°C

Where are air quality stations near St. Thomas?

Port Stanley, Ontario, Canada

11.4 km PM2.5: 9.1 µg/m³

Port Stanley, Ontario, Canada

11.4 km PM2.5: 3.1 µg/m³

London, Ontario, Canada

22.4 km PM2.5: 3.1 µg/m³

London, Ontario, Canada

22.4 km PM2.5: 4.6 µg/m³

London, Ontario, Canada

22.4 km PM2.5: 21.6 µg/m³

What cities are near St. Thomas?

27 London 29 Tillsonburg 30 Strathroy 30 Woodstock 30 Norfolk County 29 Stratford 27 Brant 27 Brantford 26 Forest Heights 26 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 2026-05-30T18:11 UTC.