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Today | Weather | Monday, January 5, 2026
Active Weather Warnings

Weather in Napa, California

06:06 AM
Now
Cloudy Weather
52° F
Feels Like 48°
Precipitation 49 %
Wind 7 mph
Humidity 86 %
Today
Rainy Weather
Day 54°
Night 48°
Precipitation 85 %
Wind 8 mph
UV Index (0 - 11+) 1

Napa Weather Forecast Updated

Last updated on

Air Quality in Napa

NOW
45 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 0.98 µg/m³
PM10 2.37 µg/m³
O3 0.049 ppm
NO2 0.2 ppb
SO2 0.1 ppb
CO 0.10 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)
PM2.5 – 0.98 µg/m³
PM10 – 2.37 µg/m³
O3 – 95.92 µg/m³
NO2 – 0.45 µg/m³
SO2 – 0.18 µg/m³
CO – 117.72 µg/m³
NH3 – 0 µg/m³
NO – 0 µg/m³
View Hourly Air Quality Forecast

Weather Alerts and Warnings for Napa

Minor Expected Likely

Coastal Flood Advisory

Coastal Flood Advisory issued January 4 at 9:36PM PST until January 5 at 3:00PM PST by NWS San Francisco CA
Jan 4, 9:36 PM → Jan 5, 3:00 PM
WHAT: Up to 1.2 ft of inundation above ground level is
possible in low-lying near shorelines and tidal waterways.

WHERE: Areas adjacent to the San Francisco and San Pablo Bays.

WHEN: Until 3 PM PST Monday.

IMPACTS: Flooding of lots, parks, and roads with only
isolated road closures expected.

ADDITIONAL DETAILS: At the San Francisco tidal gauge, high tide
is expected to be: 1.2 ft above normal (7.0 ft MLLW) at 12:08 PM
Monday 1/5. High tide varies up to 90 minutes earlier or later
along the Pacific Coast and through the San Francisco Bay,
respectively.
+ Read More
If travel is required, allow extra time as some roads may be closed. Do not drive around barricades or through water of unknown depth. Take the necessary actions to protect flood-prone property.
Updated: Jan 5, 4:24 AM Source: NWS Alert