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Today | Weather | Friday, January 23, 2026
Active Weather Warnings

Weather in Fairfield, California

09:57 PM
Now
Cloudy Night
46° F
Feels Like 45°
Precipitation 39 %
Wind 7 mph
Humidity 99 %
Today
Cloudy Night
Day 54°
Night 41°
Precipitation 25 %
Wind 10 mph

Fairfield Weather Forecast Updated

Last updated on
Weather Forecast History
Last Year's Weather on This Day (January 23, 2025)
Sunny Weather

Day

64°

Night

32°

Wind

6 mph

UV Index

3

Precipitation

0 %

Air Quality in Fairfield

NOW
36 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 6.67 µg/m³
PM10 12.78 µg/m³
O3 0.038 ppm
NO2 4.7 ppb
SO2 0.3 ppb
CO 0.16 ppm
NH3 0.06 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)
PM2.5 – 6.67 µg/m³
PM10 – 12.78 µg/m³
O3 – 75.32 µg/m³
NO2 – 8.87 µg/m³
SO2 – 0.67 µg/m³
CO – 178.52 µg/m³
NH3 – 0.06 µg/m³
NO – 0 µg/m³
View Hourly Air Quality Forecast

Weather Alerts and Warnings for Fairfield

Moderate Expected Likely

Dense Fog Advisory

Dense Fog Advisory issued January 23 at 2:34PM PST until January 24 at 10:00AM PST by NWS Sacramento CA
Jan 23, 2:34 PM → Jan 24, 10:00 AM
WHAT: Visibility one quarter mile or less in dense fog.

WHERE: Carquinez Strait and Delta, Central Sacramento Valley,
Northern San Joaquin Valley, and Southern Sacramento Valley.

WHEN: Until 10 AM PST Saturday.

IMPACTS: Low visibility could make driving conditions hazardous
during the evening commute and the Saturday morning commute.

ADDITIONAL DETAILS: Dangerous driving conditions with
visibilities lower than 500 feet at times.
+ Read More
If driving, slow down, use your headlights, and leave plenty of distance ahead of you.
Updated: Jan 23, 9:52 PM Source: NWS Alert