Fairfield, California Weather:
Active Weather Warnings
Monday, May 18, 2026
Sunny Weather
Day 90°
Night 52°
Precipitation 1 %
Wind 14 mph
UV Index (0 - 11+) 10
Weather Forecast History
Last Year's Weather on This Day (May 18, 2025)
Sunny Weather

Day

84°

Night

55°

Wind

11 mph

UV Index

10

Precipitation

0 %

Weather Alerts and Warnings for

Severe Future Possible

Fire Weather Watch

Fire Weather Watch issued May 14 at 10:24AM PDT until May 18 at 8:00PM PDT by NWS Sacramento CA
May 16, 5:00 AM May 18, 8:00 PM
The National Weather Service in Sacramento has issued a Fire
Weather Watch for gusty winds and low humidity, which is in
effect from late Friday night through Monday evening.

* Winds...North winds 15 to 25 mph. Gusts 35 to 45 mph, locally up
to 50 mph around the Delta.

* Humidity...Daytime minimum humidities of 9 to 15%.

* Highest Threat...Along the Interstate 5 corridor in the
Sacramento Valley. Strongest winds are expected Sunday into
Monday.

* Impacts...The combination of gusty winds and low humidity can
cause fire to rapidly grow in size and intensity. Outdoor
burning is not recommended
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A Fire Weather Watch means that critical fire weather conditions are forecast to occur. Listen for later forecasts and possible Red Flag Warnings.
Updated: May 15, 10:27 AM Source: NWS Alert
Severe Expected Likely

Red Flag Warning

Red Flag Warning issued May 16 at 11:44AM PDT until May 18 at 8:00PM PDT by NWS Sacramento CA
May 16, 11:44 AM May 18, 8:00 PM
* Winds...North winds 20 to 30 mph. Gusts 35 to 45 mph, locally
up to 50 mph around the Delta and the western Sacramento
Valley.

* Humidity...Daytime minimum humidities of 7 to 15%. Overnight
maximum relative humidities of 20 to 55%.

* Highest Threat...Along and west of the Interstate 5 corridor in
the Sacramento Valley. Strongest winds are expected tonight
through Sunday.

* Impacts...The combination of gusty winds and low humidity can
cause fire to rapidly grow in size and intensity. Outdoor
burning is not recommended.
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A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly. A combination of strong winds, low relative humidity, and warm temperatures can contribute to extreme fire behavior.
Updated: May 16, 4:57 PM Source: NWS Alert