Today | Weather | Tuesday, April 21, 2026

Weather in Napa, California

03:17 PM
Now
Stormy Weather
61° F
Feels Like 55°
Precipitation 55 %
Wind 13 mph
UV Index (0 - 11+) 2
Humidity 75 %
Today
Stormy Weather
Day 63°
Night 46°
Precipitation 97 %
Wind 9 mph
UV Index (0 - 11+) 3

Napa Weather Forecast Updated

Last updated on

Air Quality in Napa

NOW
53 AQI
Moderate air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 0.5 µg/m³
PM10 0.88 µg/m³
O3 0.055 ppm
NO2 0.1 ppb
SO2 0.1 ppb
CO 0.13 ppm
NH3 0 µg/m³
NO 0.04 µg/m³
PM2.5 – Fine particles <2.5μm
PM10 – Inhalable particles <10μm
O3 – Ozone
NO2 – Nitrogen dioxide
SO2 – Sulfur dioxide
CO – Carbon monoxide
NH3 – Ammonia
NO – Nitric oxide

Health Recommendations:

Air quality is acceptable; however, for some pollutants, there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution.

Show raw pollutant concentrations (µg/m³)
PM2.50.5 µg/m³
PM100.88 µg/m³
O3107.74 µg/m³
NO20.21 µg/m³
SO20.3 µg/m³
CO144.05 µg/m³
NH30 µg/m³
NO0.04 µg/m³