Today | Weather | Sunday, September 20, 2026

Weather in Fairfield, California

11:21 PM
Now
Cloudy Night
61° F
Feels Like 55°
Precipitation 0 %
Wind 14 mph
Humidity 83 %
Today
Cloudy Night
Day 72°
Night 57°
Precipitation 0 %
Wind 12 mph

Fairfield Weather Forecast Updated

Weather Forecast History
Last Year's Weather on This Day (September 20, 2025)
Night

Day

84°

Night

61°

Wind

10 mph

Precipitation

1 %

Air Quality in Fairfield

NOW
41 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 3.57 µg/m³
PM10 12.46 µg/m³
O3 0.044 ppm
NO2 0.4 ppb
SO2 0.3 ppb
CO 0.12 ppm
NH3 0 µg/m³
NO 0 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 considered satisfactory, and air pollution poses little or no risk.

Show raw pollutant concentrations (µg/m³)
PM2.53.57 µg/m³
PM1012.46 µg/m³
O386.9 µg/m³
NO20.83 µg/m³
SO20.68 µg/m³
CO140.61 µg/m³
NH30 µg/m³
NO0 µg/m³