Air Quality in Jamestown, Saint Helena, Ascension and Tristan da Cunha
Windy
19.6°C · 84.0% humidity
19.6°
Feels 19.6°
41
Good
Air quality is satisfactory. Enjoy outdoor activities.
Model forecast
Nearby Monitoring Stations
Jamestown's air quality — share it
AQI Forecast
54
6pm
54
54
41
9pm
45
27
29
12am
31
25
25
3am
33
33
33
6am
34
34
34
9am
34
34
34
12pm
34
34
34
3pm
34
34
84.0%
Humidity
99.8 km/h
Wind E
1020.6 hPa
Pressure
0.7
UV Low
GoodModerateUSGUnhealthyVery UnhealthyHazardous
Which pollutant is driving the AQI?
PM2.5▲
9.75 µg/m³
PM10
20.55 µg/m³
050100150200300500
What is the weather forecast for Jamestown?
Temperature & Precipitation
PM2.59.75 µg/m³
✓ WHO
Good
PM1020.55 µg/m³
Good
UV INDEX0.7
Low
What is the 7-day forecast for Jamestown?
09-20
19.7° 18.9°
0.31 mm
09-21
19.6° 18.8°
0.38 mm
09-22
19.6° 19.2°
0.44 mm
09-23
20.1° 18.8°
0.19 mm
09-24
20.1° 18.8°
0.44 mm
09-25
20.2° 19.2°
0.38 mm
09-26
20.1° 19.7°
0.06 mm
Both models agree
Avg diff: 0.9°C
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Data sources: Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-09-20T21:59 UTC.