Hourly Weather | Today Wednesday, August 12, 2026
Active Weather Warnings
Napa, California
6 AM
Cloudy Night
55°
Feels Like 54°
0
Humidity: 98%
UV Index: 0
Wind: 6 mph
7 AM
Cloudy Weather
55°
Feels Like 57°
0
Humidity: 95%
UV Index: 1
Wind: 6 mph
8 AM
Cloudy Weather
57°
Feels Like 59°
0
Humidity: 87%
UV Index: 1
Wind: 5 mph
9 AM
Cloudy Weather
63°
Feels Like 63°
0
Humidity: 81%
UV Index: 1
Wind: 6 mph
10 AM
Cloudy Weather
64°
Feels Like 66°
0
Humidity: 74%
UV Index: 2
Wind: 6 mph
11 AM
Cloudy Weather
68°
Feels Like 70°
0
Humidity: 68%
UV Index: 3
Wind: 7 mph
12 PM
Cloudy Weather
72°
Feels Like 73°
0
Humidity: 61%
UV Index: 3
Wind: 8 mph
1 PM
Cloudy Weather
73°
Feels Like 75°
0
Humidity: 56%
UV Index: 4
Wind: 9 mph
2 PM
Cloudy Weather
77°
Feels Like 82°
0
Humidity: 52%
UV Index: 8
Wind: 10 mph
3 PM
Cloudy Weather
79°
Feels Like 81°
0
Humidity: 50%
UV Index: 6
Wind: 12 mph
4 PM
Cloudy Weather
75°
Feels Like 79°
0
Humidity: 54%
UV Index: 4
Wind: 12 mph
5 PM
Cloudy Weather
75°
Feels Like 75°
0
Humidity: 55%
UV Index: 3
Wind: 12 mph
6 PM
Cloudy Weather
73°
Feels Like 72°
0
Humidity: 59%
UV Index: 2
Wind: 12 mph
7 PM
Cloudy Weather
70°
Feels Like 68°
0
Humidity: 66%
UV Index: 1
Wind: 10 mph
8 PM
Cloudy Weather
66°
Feels Like 64°
0
Humidity: 73%
UV Index: 0
Wind: 9 mph
9 PM
Cloudy Night
64°
Feels Like 63°
0
Humidity: 79%
UV Index: 0
Wind: 8 mph
10 PM
Cloudy Night
61°
Feels Like 59°
0
Humidity: 86%
UV Index: 0
Wind: 8 mph
11 PM
Cloudy Night
61°
Feels Like 57°
0
Humidity: 87%
UV Index: 0
Wind: 8 mph

Hourly Air Quality Forecast - AQI (US EPA)

6 AM
23 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.47 µg/m³
  • PM10: 10.02 µg/m³
  • O3: 0.025 ppm
  • NO2: 0.7 ppb
  • SO2: 0.3 ppb
  • CO: 0.07 ppm

Health Recommendations:

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

7 AM
22 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.36 µg/m³
  • PM10: 9.46 µg/m³
  • O3: 0.024 ppm
  • NO2: 0.7 ppb
  • SO2: 0.3 ppb
  • CO: 0.07 ppm

Health Recommendations:

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

8 AM
22 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.16 µg/m³
  • PM10: 8.71 µg/m³
  • O3: 0.023 ppm
  • NO2: 0.7 ppb
  • SO2: 0.3 ppb
  • CO: 0.07 ppm

Health Recommendations:

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

9 AM
21 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 2.82 µg/m³
  • PM10: 7.23 µg/m³
  • O3: 0.023 ppm
  • NO2: 0.6 ppb
  • SO2: 0.2 ppb
  • CO: 0.07 ppm

Health Recommendations:

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

10 AM
21 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 2.62 µg/m³
  • PM10: 6.36 µg/m³
  • O3: 0.023 ppm
  • NO2: 0.6 ppb
  • SO2: 0.2 ppb
  • CO: 0.07 ppm

Health Recommendations:

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

11 AM
21 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 2.58 µg/m³
  • PM10: 6.15 µg/m³
  • O3: 0.023 ppm
  • NO2: 0.5 ppb
  • SO2: 0.2 ppb
  • CO: 0.07 ppm

Health Recommendations:

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

12 PM
22 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 2.6 µg/m³
  • PM10: 6.46 µg/m³
  • O3: 0.023 ppm
  • NO2: 0.4 ppb
  • SO2: 0.2 ppb
  • CO: 0.07 ppm

Health Recommendations:

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

1 PM
23 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 2.71 µg/m³
  • PM10: 6.98 µg/m³
  • O3: 0.024 ppm
  • NO2: 0.3 ppb
  • SO2: 0.2 ppb
  • CO: 0.07 ppm

Health Recommendations:

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

2 PM
24 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 2.88 µg/m³
  • PM10: 7.48 µg/m³
  • O3: 0.026 ppm
  • NO2: 0.3 ppb
  • SO2: 0.2 ppb
  • CO: 0.07 ppm

Health Recommendations:

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

3 PM
25 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.13 µg/m³
  • PM10: 8.1 µg/m³
  • O3: 0.027 ppm
  • NO2: 0.2 ppb
  • SO2: 0.2 ppb
  • CO: 0.07 ppm

Health Recommendations:

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

4 PM
25 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.36 µg/m³
  • PM10: 8.57 µg/m³
  • O3: 0.028 ppm
  • NO2: 0.2 ppb
  • SO2: 0.2 ppb
  • CO: 0.07 ppm

Health Recommendations:

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

5 PM
26 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.52 µg/m³
  • PM10: 8.98 µg/m³
  • O3: 0.028 ppm
  • NO2: 0.2 ppb
  • SO2: 0.2 ppb
  • CO: 0.07 ppm

Health Recommendations:

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

6 PM
26 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.67 µg/m³
  • PM10: 9.54 µg/m³
  • O3: 0.028 ppm
  • NO2: 0.3 ppb
  • SO2: 0.2 ppb
  • CO: 0.07 ppm

Health Recommendations:

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

7 PM
26 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.84 µg/m³
  • PM10: 10.55 µg/m³
  • O3: 0.028 ppm
  • NO2: 0.3 ppb
  • SO2: 0.2 ppb
  • CO: 0.07 ppm

Health Recommendations:

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

8 PM
26 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.94 µg/m³
  • PM10: 11.43 µg/m³
  • O3: 0.028 ppm
  • NO2: 0.3 ppb
  • SO2: 0.2 ppb
  • CO: 0.07 ppm

Health Recommendations:

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

9 PM
26 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.96 µg/m³
  • PM10: 11.9 µg/m³
  • O3: 0.028 ppm
  • NO2: 0.4 ppb
  • SO2: 0.2 ppb
  • CO: 0.07 ppm

Health Recommendations:

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

10 PM
25 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.99 µg/m³
  • PM10: 12.28 µg/m³
  • O3: 0.027 ppm
  • NO2: 0.4 ppb
  • SO2: 0.3 ppb
  • CO: 0.07 ppm

Health Recommendations:

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

11 PM
25 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 4.06 µg/m³
  • PM10: 12.67 µg/m³
  • O3: 0.027 ppm
  • NO2: 0.4 ppb
  • SO2: 0.3 ppb
  • CO: 0.07 ppm

Health Recommendations:

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

Weather Alerts and Warnings for Napa

Minor Expected Likely

Coastal Flood Advisory

Coastal Flood Advisory issued August 11 at 11:14PM PDT until August 13 at 2:00AM PDT by NWS San Francisco CA
Aug 11, 11:14 PM Aug 13, 2:00 AM
WHAT: Up to 1.4 ft of inundation above ground level is
possible in low-lying areas near shorelines and tidal
waterways.

WHERE: Bayshore locations along the San Francisco Bay, San
Pablo Bay, and Monterey Bay.

WHEN: Until 2 AM PDT Thursday.

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 1.4 ft above normal (7.24 ft MLLW) at 11:49
PM Wednesday 8/12. These predictions include both astronomical
tides and roughly 3-6 inches of additional water mainly from a
combination of thermal expansion and accumulated sea level rise
since the tidal datum was established (1983- 2001). 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: Aug 12, 4:04 AM Source: NWS Alert