Hourly Weather Forecast for Fairfield, California

Hourly Weather | Today › Friday, October 9, 2026

Active Weather Warnings

Heat Advisory
Wind Advisory

Fairfield, California

4 PM

79°

Feels Like 75°

Humidity: 45%

UV Index: 2

Wind: 15 mph

5 PM

75°

Feels Like 73°

Humidity: 49%

UV Index: 2

Wind: 16 mph

6 PM

73°

Feels Like 70°

Humidity: 55%

UV Index: 1

Wind: 16 mph

7 PM

70°

Feels Like 64°

Humidity: 62%

UV Index: 0

Wind: 15 mph

8 PM

66°

Feels Like 63°

Humidity: 67%

UV Index: 0

Wind: 16 mph

9 PM

64°

Feels Like 59°

Humidity: 73%

UV Index: 0

Wind: 16 mph

10 PM

61°

Feels Like 55°

Humidity: 80%

UV Index: 0

Wind: 17 mph

11 PM

61°

Feels Like 55°

Humidity: 82%

UV Index: 0

Wind: 18 mph

Hourly Air Quality Forecast - AQI (US EPA)

4 PM

40 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 8.23 µg/m³
PM₁₀: 20.36 µg/m³
O₃: 0.043 ppm
NO₂: 0.8 ppb
SO₂: 0.4 ppb
CO: 0.12 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

5 PM

40 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 7.65 µg/m³
PM₁₀: 19.48 µg/m³
O₃: 0.043 ppm
NO₂: 0.9 ppb
SO₂: 0.4 ppb
CO: 0.11 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

6 PM

40 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 7.07 µg/m³
PM₁₀: 18.58 µg/m³
O₃: 0.043 ppm
NO₂: 1 ppb
SO₂: 0.3 ppb
CO: 0.11 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

7 PM

40 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 6.43 µg/m³
PM₁₀: 17.6 µg/m³
O₃: 0.043 ppm
NO₂: 1 ppb
SO₂: 0.3 ppb
CO: 0.11 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

8 PM

40 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 5.77 µg/m³
PM₁₀: 16.54 µg/m³
O₃: 0.043 ppm
NO₂: 0.8 ppb
SO₂: 0.3 ppb
CO: 0.11 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

9 PM

40 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 5.2 µg/m³
PM₁₀: 15.44 µg/m³
O₃: 0.043 ppm
NO₂: 0.6 ppb
SO₂: 0.3 ppb
CO: 0.10 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

10 PM

40 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 4.76 µg/m³
PM₁₀: 14.49 µg/m³
O₃: 0.043 ppm
NO₂: 0.6 ppb
SO₂: 0.3 ppb
CO: 0.10 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

11 PM

39 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 4.38 µg/m³
PM₁₀: 13.74 µg/m³
O₃: 0.042 ppm
NO₂: 0.6 ppb
SO₂: 0.3 ppb
CO: 0.10 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

Current Real-Time Air Quality Report

Weather Alerts and Warnings for Fairfield

Moderate Expected Likely

Heat Advisory

Heat Advisory issued October 6 at 11:32AM PDT until October 9 at 10:00PM PDT by NWS Sacramento CA

Oct 6, 11:32 AM → Oct 9, 10:00 PM

WHAT: High temperatures of 94 to 102 degrees expected and overnight low temperatures in the mid 60s to low 70s, with widespread Moderate HeatRisk and areas of Major HeatRisk. WHERE: The Sacramento and northern San Joaquin Valleys, Delta and Carquinez Strait, and foothills. WHEN: Until 10 PM PDT Friday. IMPACTS: Hot temperatures may cause heat illnesses, especially to anyone without effective cooling and/or adequate hydration. ADDITIONAL DETAILS: Hottest days expected Tuesday through Thursday.

+ Read More

Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke.

Updated: Oct 7, 7:53 AM Source: NWS Alert

Moderate Expected Likely

Wind Advisory

Wind Advisory issued October 9 at 9:05AM PDT until October 10 at 7:00AM PDT by NWS Sacramento CA

Oct 9, 11:00 PM → Oct 10, 7:00 AM

WHAT: Southwest winds 20 to 30 mph with gusts up to 45 mph
expected.

WHERE: Delta and along Interstate 80, Carquinez Straight, and
vicinity Valley locations south of Interstate

WHEN: From 11 PM this evening to 7 AM PDT Saturday.

IMPACTS: Gusty winds will blow around unsecured objects and any
seasonal decor. Tree limbs could be blown down and a few power
outages may result.

ADDITIONAL DETAILS: Strongest winds expected overnight.

+ Read More

Winds this strong can make driving difficult, especially for high profile vehicles. Use extra caution.

Updated: Oct 9, 1:53 PM Source: NWS Alert

Hourly Air Quality Forecast - AQI (US EPA)

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Weather Alerts and Warnings for Fairfield

Heat Advisory

Wind Advisory

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