Hourly Weather | Today › Friday, October 9, 2026
Active Weather Warnings
San Francisco, California
5 AM
Cloudy Weather
57°
Feels Like 55°
0
Humidity: 91%
UV Index: 0
Wind: 6 mph
6 AM
Cloudy Weather
57°
Feels Like 55°
0
Humidity: 91%
UV Index: 0
Wind: 6 mph
7 AM
Cloudy Weather
57°
Feels Like 57°
0
Humidity: 91%
UV Index: 0
Wind: 5 mph
8 AM
Cloudy Weather
59°
Feels Like 59°
0
Humidity: 89%
UV Index: 0
Wind: 5 mph
9 AM
Cloudy Weather
61°
Feels Like 61°
0
Humidity: 86%
UV Index: 0
Wind: 6 mph
10 AM
Cloudy Weather
63°
Feels Like 61°
0
Humidity: 83%
UV Index: 1
Wind: 6 mph
11 AM
Cloudy Weather
63°
Feels Like 63°
0
Humidity: 80%
UV Index: 1
Wind: 8 mph
12 PM
Cloudy Weather
64°
Feels Like 63°
0
Humidity: 78%
UV Index: 1
Wind: 9 mph
1 PM
Cloudy Weather
64°
Feels Like 63°
0
Humidity: 77%
UV Index: 1
Wind: 12 mph
2 PM
Cloudy Weather
66°
Feels Like 66°
0
Humidity: 74%
UV Index: 4
Wind: 16 mph
3 PM
Cloudy Weather
64°
Feels Like 64°
0
Humidity: 76%
UV Index: 3
Wind: 17 mph
4 PM
Cloudy Weather
64°
Feels Like 63°
0
Humidity: 77%
UV Index: 2
Wind: 17 mph
5 PM
Cloudy Weather
63°
Feels Like 59°
0
Humidity: 80%
UV Index: 2
Wind: 17 mph
6 PM
Cloudy Weather
63°
Feels Like 57°
0
Humidity: 80%
UV Index: 1
Wind: 16 mph
7 PM
Cloudy Night
61°
Feels Like 55°
0
Humidity: 83%
UV Index: 0
Wind: 16 mph
8 PM
Cloudy Night
61°
Feels Like 55°
0
Humidity: 83%
UV Index: 0
Wind: 13 mph
9 PM
Cloudy Night
61°
Feels Like 55°
0
Humidity: 85%
UV Index: 0
Wind: 13 mph
10 PM
Cloudy Night
61°
Feels Like 55°
0
Humidity: 83%
UV Index: 0
Wind: 13 mph
11 PM
Cloudy Night
61°
Feels Like 55°
0
Humidity: 83%
UV Index: 0
Wind: 13 mph

Hourly Air Quality Forecast - AQI (US EPA)

5 AM
53 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 13.42 µg/m³
  • PM10: 31.48 µg/m³
  • O3: 0.040 ppm
  • NO2: 0.6 ppb
  • SO2: 0.4 ppb
  • CO: 0.12 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

6 AM
53 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 13.57 µg/m³
  • PM10: 30.91 µg/m³
  • O3: 0.040 ppm
  • NO2: 0.6 ppb
  • SO2: 0.4 ppb
  • CO: 0.12 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

7 AM
53 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 13.53 µg/m³
  • PM10: 30.11 µg/m³
  • O3: 0.039 ppm
  • NO2: 0.7 ppb
  • SO2: 0.4 ppb
  • CO: 0.12 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

8 AM
53 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 13.29 µg/m³
  • PM10: 29.35 µg/m³
  • O3: 0.039 ppm
  • NO2: 0.7 ppb
  • SO2: 0.4 ppb
  • CO: 0.12 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

9 AM
52 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 12.9 µg/m³
  • PM10: 28.57 µg/m³
  • O3: 0.038 ppm
  • NO2: 0.8 ppb
  • SO2: 0.4 ppb
  • CO: 0.12 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

10 AM
51 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 12.4 µg/m³
  • PM10: 27.85 µg/m³
  • O3: 0.038 ppm
  • NO2: 0.7 ppb
  • SO2: 0.4 ppb
  • CO: 0.12 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

11 AM
49 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 11.81 µg/m³
  • PM10: 27.21 µg/m³
  • O3: 0.039 ppm
  • NO2: 0.6 ppb
  • SO2: 0.4 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

12 PM
47 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 11.17 µg/m³
  • PM10: 26.82 µg/m³
  • O3: 0.040 ppm
  • NO2: 0.5 ppb
  • SO2: 0.4 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

1 PM
44 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 10.63 µg/m³
  • PM10: 26.62 µg/m³
  • O3: 0.042 ppm
  • NO2: 0.4 ppb
  • SO2: 0.4 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

2 PM
42 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 10.19 µg/m³
  • PM10: 26.55 µg/m³
  • O3: 0.043 ppm
  • NO2: 0.3 ppb
  • SO2: 0.4 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

3 PM
41 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 9.73 µg/m³
  • PM10: 26.66 µg/m³
  • O3: 0.044 ppm
  • NO2: 0.3 ppb
  • SO2: 0.4 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 9.22 µg/m³
  • PM10: 26.81 µg/m³
  • O3: 0.044 ppm
  • NO2: 0.3 ppb
  • SO2: 0.4 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 8.61 µg/m³
  • PM10: 26.62 µg/m³
  • O3: 0.044 ppm
  • NO2: 0.3 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
41 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 7.82 µg/m³
  • PM10: 25.37 µg/m³
  • O3: 0.045 ppm
  • NO2: 0.4 ppb
  • SO2: 0.4 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 6.9 µg/m³
  • PM10: 23.53 µg/m³
  • O3: 0.044 ppm
  • NO2: 0.4 ppb
  • SO2: 0.3 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 6.01 µg/m³
  • PM10: 21.65 µg/m³
  • O3: 0.044 ppm
  • NO2: 0.4 ppb
  • SO2: 0.3 ppb
  • CO: 0.10 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:

  • PM2.5: 5.3 µg/m³
  • PM10: 20.02 µg/m³
  • O3: 0.044 ppm
  • NO2: 0.4 ppb
  • SO2: 0.3 ppb
  • CO: 0.09 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:

  • PM2.5: 4.78 µg/m³
  • PM10: 18.69 µg/m³
  • O3: 0.043 ppm
  • NO2: 0.4 ppb
  • SO2: 0.3 ppb
  • CO: 0.09 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:

  • PM2.5: 4.43 µg/m³
  • PM10: 17.54 µg/m³
  • O3: 0.042 ppm
  • NO2: 0.4 ppb
  • SO2: 0.3 ppb
  • CO: 0.09 ppm

Health Recommendations:

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

Weather Alerts and Warnings for San Francisco

Minor Expected Likely

Coastal Flood Advisory

Coastal Flood Advisory issued October 8 at 9:45PM PDT until October 13 at 3:00PM PDT by NWS San Francisco CA
Oct 9, 9:00 AM → Oct 13, 3:00 PM
WHAT: For the Coastal Flood Advisory, Up to 1.4 ft of
inundation above ground level is possible in low-lying areas
near shorelines and tidal waterways. For the Beach Hazards
Statement, increased risk of rip currents and sneaker waves
expected with breaking waves up to 16 feet.

WHERE: San Francisco, Northern Monterey Bay and Southern
Monterey Bay and Big Sur Coast Counties.

WHEN: For the Coastal Flood Advisory, from 9 AM Friday to 3
PM PDT Tuesday. For the Beach Hazards Statement, from Saturday
morning through Monday afternoon.

IMPACTS: Flooding of lots, parks, and roads with only
isolated road closures expected. High tides will result in
flooding along coastal trails, cut off access to some low-
lying beaches and coastal areas, and bring water and waves
farther up the beach than typical. Dangerous conditions are
forecast along the shoreline. Hazards include sneaker waves,
strong rip currents, and large breaking waves.

ADDITIONAL DETAILS: At the San Francisco tidal gauge, high tide
is expected to be 1.2 ft above normal (7.1 ft MLLW) at 11:22 AM
Friday 10/9, 1.4 ft above normal (7.3 ft MLLW) at 11:50 AM
Saturday 10/10, 1.3 ft above normal (7.2 ft MLLW) at 12:18 PM
Sunday 10/11, 1.2 ft above normal (7.1 ft MLLW) at 12:46 PM
Monday 10/12, and 1.1 ft above normal (7.0 ft MLLW) at 1:14 PM
Tuesday 10/13. These predictions include up to 1.2 ft of surge
that will enhance the astronomical tide and flooding threat.
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. Stay off of jetties, piers, rocks, and other waterside infrastructure. Remain out of the water to avoid hazardous surf and NEVER turn your back on the ocean. Monitor local weather, surf and tide forecasts at www.weather.gov/mtr.
Updated: Oct 9, 4:27 AM Source: NWS Alert