Today | Weather | Wednesday, May 20, 2026

Weather in Fairfield, California

01:50 PM
Now
Cloudy Weather
90° F
Feels Like 93°
Precipitation 0 %
Wind 10 mph
UV Index (0 - 11+) 9
Humidity 21 %
Today
Cloudy Weather
Day 90°
Night 55°
Precipitation 0 %
Wind 8 mph
UV Index (0 - 11+) 10

Warning: High UV Index Today: 10

High risk of harm from unprotected sun exposure. Take precautions: wear a hat, sunglasses, and apply sunscreen regularly if you’ll be outdoors for extended periods.

Fairfield Weather Forecast Updated

Last updated on
Weather Forecast History
Last Year's Weather on This Day (May 20, 2025)
Sunny Weather

Day

86°

Night

52°

Wind

8 mph

UV Index

10

Precipitation

0 %

Air Quality in Fairfield

NOW
39 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 5.34 µg/m³
PM10 12.13 µg/m³
O3 0.042 ppm
NO2 0.7 ppb
SO2 0.4 ppb
CO 0.10 ppm
NH3 0.25 µg/m³
NO 0.33 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)
PM2.55.34 µg/m³
PM1012.13 µg/m³
O382.61 µg/m³
NO21.25 µg/m³
SO20.92 µg/m³
CO119.8 µg/m³
NH30.25 µg/m³
NO0.33 µg/m³