What is the air quality in Siena today?

The current Air Quality Index (AQI) in Siena is 25 (Good). PM2.5 concentration is 6.0 µg/m³.

What is the temperature in Siena right now?

The current temperature in Siena is 15.8°C (feels like 15.8°C). Humidity is 74.0% and wind speed is 64.6 km/h.

Is it safe to go outside in Siena?

Air quality is satisfactory. Enjoy outdoor activities. The UV Index is 0.0 (Low).

Air Quality in Siena, Italy

Windy

15.8°C · 74.0% humidity

15.8°

Feels 15.8°

Good

Air quality is satisfactory. Enjoy outdoor activities.

Model forecast

Nearby Monitoring Stations

AQI Forecast

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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.

74.0%

Humidity

64.6 km/h

Wind NNE

1014.6 hPa

Pressure

0.0

UV Low

GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲

6.0 µg/m³

PM10

13.7 µg/m³

050100150200300500

What is the weather forecast for Siena?

Temperature & Precipitation

PM2.56.0 µg/m³ ✓ WHO

Good

PM1013.7 µg/m³

Good

UV INDEX0.0

Low

What is the 7-day forecast for Siena?

10-21

16.5° 6.2°

1.94 mm

10-22

21.2° 7.3°

10-23

15.6° 8.7°

0.69 mm

10-24

13.9° 5.1°

0.06 mm

10-25

20.4° 8.6°

0.62 mm

10-26

17.4° 8.6°

4.0 mm

10-27

17.0° 7.9°

3.75 mm

Both models agree Avg diff: 2.4°C

What cities are near Siena?

25 Colle di Val d'Elsa 25 Poggibonsi 35 Montevarchi 35 San Giovanni Valdarno 37 Arezzo 35 Scandicci 35 Campo di Marte 35 Florence 33 Empoli 25 San Miniato

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

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Data sources: Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-10-21T12:31 UTC.