What is the air quality in Siena today?

The current Air Quality Index (AQI) in Siena is 39 (Good). PM2.5 concentration is 9.38 µg/m³.

What is the temperature in Siena right now?

The current temperature in Siena is 19.9°C (feels like 19.9°C). Humidity is 79.6% and wind speed is 6.0 km/h.

Is it safe to go outside in Siena?

Air quality is satisfactory. Enjoy outdoor activities. The UV Index is 0.7 (Low).

Air Quality in Siena, Italy

Cloudy

19.9°C · 79.6% humidity

19.9°

Feels 19.9°

Good

Air quality is satisfactory. Enjoy outdoor activities.

Calibrated model

Nearby Monitoring Stations

AQI Forecast

25 8pm

39 11pm

31 2am

29 5am

28 8am

25 11am

25 2pm

25 5pm

View AQI history for Siena →

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.

79.6%

Humidity

6.0 km/h

Wind SW

1014.2 hPa

Pressure

0.7

UV Low

GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲

9.38 µg/m³

PM10

13.7 µg/m³

050100150200300500

What is the weather forecast for Siena?

Temperature & Precipitation

PM2.59.38 µg/m³ ✓ WHO

Good

PM1013.7 µg/m³

Good

UV INDEX0.7

Low

What is the 7-day forecast for Siena?

07-21

37.7° 19.9°

07-22

31.4° 19.9°

07-23

33.3° 19.6°

07-24

33.6° 17.3°

07-25

37.3° 18.3°

07-26

35.4° 19.1°

07-27

41.8° 18.0°

Both models agree Avg diff: 3.6°C

What cities are near Siena?

39 Colle di Val d'Elsa 39 Poggibonsi 27 Montevarchi 28 San Giovanni Valdarno 26 Arezzo 38 Scandicci 37 Campo di Marte 37 Florence 41 Empoli 39 San Miniato

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ModerateAQI > 50 Unhealthy for Sensitive GroupsAQI > 100 UnhealthyAQI > 150 Very UnhealthyAQI > 200

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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 2026-07-21T21:32 UTC.