What is the air quality in St. Thomas today?

The current Air Quality Index (AQI) in St. Thomas is 28 (Good). PM2.5 concentration is 6.68 µg/m³.

What is the temperature in St. Thomas right now?

The current temperature in St. Thomas is 8.2°C (feels like 1.3°C). Humidity is 89.5% and wind speed is 99.6 km/h.

Is it safe to go outside in St. Thomas?

Air quality is satisfactory. Enjoy outdoor activities. The UV Index is 2.2 (Moderate).

Air Quality in St. Thomas, Canada

Drizzle

8.2°C · 89.5% humidity

8.2°

Feels 1.3°

Good

Air quality is satisfactory. Enjoy outdoor activities.

2 stations

Nearby Monitoring Stations

AQI Forecast Calibrated

39 4pm

28 7pm

36 10pm

39 1am

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Station readings 25h ago

AQI 39

PM2.5 9.4 µg/m³ · 25h ago

Air Quality Index Trend

36h · 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.

89.5%

Humidity

99.6 km/h

Wind NW

1004.3 hPa

Pressure

2.2

UV Moderate

GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲

6.68 µg/m³

PM10

13.7 µg/m³

050100150200300500

What is the weather forecast for St. Thomas?

Temperature & Precipitation

PM2.5 Trend

36h · 2 stations

PM2.56.68 µg/m³ ✓ WHO

Good

PM1013.7 µg/m³

Good

UV INDEX2.2

Moderate

Station readings (2 stations within 25 km)

6.68

Median

7.95

Average

5.8

Low

10.1

High

PM2.5 µg/m³ · Model: 7.0 · Bias: +0.3

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

06-08

25.3° 7.7°

1.88 mm

06-09

26.6° 8.2°

0.19 mm

06-10

15.7° 13.8°

11.44 mm

06-11

22.2° 9.8°

06-12

26.5° 17.1°

6.75 mm

06-13

23.5° 18.1°

1.94 mm

06-14

25.8° 13.6°

Both models agree Avg diff: 6.5°C

Where are air quality stations near St. Thomas?

Port Stanley, Ontario, Canada

11.4 km PM2.5: 10.8 µg/m³

149

Port Stanley, Ontario, Canada

11.4 km PM2.5: 55.0 µg/m³

London, Ontario, Canada

22.4 km PM2.5: 30.2 µg/m³

London, Ontario, Canada

22.4 km PM2.5: 21.1 µg/m³

London, Ontario, Canada

22.4 km PM2.5: 3.1 µg/m³

What cities are near St. Thomas?

42 London 44 Tillsonburg 30 Strathroy 45 Woodstock 45 Norfolk County 45 Stratford 38 Brant 38 Brantford 34 Forest Heights 35 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 2026-06-08T23:10 UTC.