Air Quality in Siena, Italy
Clear
23.1°C · 33.9% humidity
23.1°
Feels 23.1°
31
Good
Air quality is satisfactory. Enjoy outdoor activities.
Model forecast
Nearby Monitoring Stations
Siena's air quality — share it
AQI Forecast
27
4pm
27
27
31
7pm
27
34
34
10pm
54
54
54
1am
54
54
54
4am
54
54
54
7am
54
54
54
10am
54
34
34
1pm
34
27
Siena's air quality is shaped by traffic emissions and residential heating. Pollution levels tend to peak during winter months when cold air traps emissions close to ground level.
33.9%
Humidity
31.5 km/h
Wind NW
1019.2 hPa
Pressure
0.7
UV Low
GoodModerateUSGUnhealthyVery UnhealthyHazardous
Which pollutant is driving the AQI?
PM2.5▲
7.35 µg/m³
PM10
20.55 µg/m³
050100150200300500
What is the weather forecast for Siena?
Temperature & Precipitation
PM2.57.35 µg/m³
✓ WHO
Good
PM1020.55 µg/m³
Good
UV INDEX0.7
Low
What is the 7-day forecast for Siena?
09-05
32.8° 15.4°
09-06
29.8° 17.1°
0.06 mm
09-07
31.3° 17.0°
0.25 mm
09-08
29.8° 18.3°
09-09
30.2° 16.6°
2.87 mm
09-10
33.6° 16.4°
0.13 mm
09-11
29.9° 12.8°
0.25 mm
Both models agree
Avg diff: 3.7°C
What cities are near Siena?
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Data sources: Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-09-05T17:54 UTC.