Today | Weather | Friday, September 18, 2026

Weather in Fairfield, California

05:33 AM
Now
Cloudy Night
55° F
Feels Like 52°
Precipitation 0 %
Wind 7 mph
Humidity 94 %
Today
Sunny Weather
Day 88°
Night 57°
Precipitation 0 %
Wind 8 mph
UV Index (0 - 11+) 6

Fairfield Weather Forecast Updated

30 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (September 18, 2025)
Stormy Weather

Day

82°

Night

64°

Wind

9 mph

Precipitation

55 %

Air Quality in Fairfield

NOW
34 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 6.86 µg/m³
PM10 17.02 µg/m³
O3 0.037 ppm
NO2 1.1 ppb
SO2 0.3 ppb
CO 0.15 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)
PM2.56.86 µg/m³
PM1017.02 µg/m³
O371.88 µg/m³
NO22.07 µg/m³
SO20.82 µg/m³
CO175.45 µg/m³
NH30 µg/m³
NO0 µg/m³