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Hourly Weather | Today › Saturday, January 3, 2026
Active Weather Warnings
San Francisco, California
2 PM
Cloudy Weather
61°
Feels Like 55°
34
Humidity: 78%
Wind: 20 mph
UV Index: 1
3 PM
Cloudy Weather
61°
Feels Like 54°
37
Humidity: 77%
Wind: 20 mph
UV Index: 1
4 PM
Cloudy Weather
59°
Feels Like 54°
48
Humidity: 81%
Wind: 18 mph
UV Index: 0
5 PM
Partly Sunny with Showers
59°
Feels Like 48°
52
Humidity: 82%
Wind: 17 mph
UV Index: 0
6 PM
Cloudy Night
57°
Feels Like 52°
48
Humidity: 82%
Wind: 17 mph
UV Index: 0
7 PM
Cloudy Weather
59°
Feels Like 52°
49
Humidity: 80%
Wind: 18 mph
UV Index: 0
8 PM
Rainy Weather
59°
Feels Like 48°
73
Humidity: 82%
Wind: 18 mph
UV Index: 0
9 PM
Rainy Weather
59°
Feels Like 48°
73
Humidity: 82%
Wind: 17 mph
UV Index: 0
10 PM
Rainy Weather
57°
Feels Like 48°
73
Humidity: 83%
Wind: 17 mph
UV Index: 0
11 PM
Cloudy Weather
57°
Feels Like 52°
49
Humidity: 83%
Wind: 17 mph
UV Index: 0

Hourly Air Quality Forecast - AQI (US EPA)

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

Pollutant Concentrations:

  • PM2.5: 2.63 µg/m³
  • PM10: 9.66 µg/m³
  • O3: 0.048 ppm
  • NO2: 0.2 ppb
  • SO2: 0.1 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.5 µg/m³
  • PM10: 9.27 µg/m³
  • O3: 0.047 ppm
  • NO2: 0.2 ppb
  • SO2: 0.1 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.22 µg/m³
  • PM10: 8.17 µg/m³
  • O3: 0.047 ppm
  • NO2: 0.2 ppb
  • SO2: 0.1 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.86 µg/m³
  • PM10: 6.78 µg/m³
  • O3: 0.046 ppm
  • NO2: 0.3 ppb
  • SO2: 0.1 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.54 µg/m³
  • PM10: 5.59 µg/m³
  • O3: 0.046 ppm
  • NO2: 0.3 ppb
  • SO2: 0.1 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.31 µg/m³
  • PM10: 4.74 µg/m³
  • O3: 0.045 ppm
  • NO2: 0.3 ppb
  • SO2: 0.1 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.13 µg/m³
  • PM10: 3.53 µg/m³
  • O3: 0.045 ppm
  • NO2: 0.3 ppb
  • SO2: 0.1 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.01 µg/m³
  • PM10: 2.71 µg/m³
  • O3: 0.045 ppm
  • NO2: 0.3 ppb
  • SO2: 0.1 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 0.95 µg/m³
  • PM10: 2.35 µg/m³
  • O3: 0.045 ppm
  • NO2: 0.3 ppb
  • SO2: 0.1 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 0.94 µg/m³
  • PM10: 2.25 µg/m³
  • O3: 0.045 ppm
  • NO2: 0.3 ppb
  • SO2: 0.1 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 San Francisco

Severe Expected Likely

Coastal Flood Warning

Coastal Flood Warning issued January 2 at 10:59PM PST until January 3 at 2:00PM PST by NWS San Francisco CA
Jan 2, 10:59 PM → Jan 3, 2:00 PM
WHAT: For the Coastal Flood Warning, significant coastal
flooding expected due to high astronomical tides and storm
surge. Up to 2.5 ft of inundation above ground level is
possible in low-lying areas near shorelines and tidal
waterways during the morning high tide Saturday. For the
Coastal Flood Advisory, up to 2.0 ft inundation is
possible.

WHERE: San Francisco.

WHEN: For the Coastal Flood Warning, until 2 PM PST Saturday.
For the Coastal Flood Advisory, from 2 PM Saturday to 2 PM PST
Sunday. For the Beach Hazards Statement, from Sunday morning
through Sunday evening.

IMPACTS: Numerous roads will be closed. Low lying property
including homes, businesses, and some critical infrastructure
will be inundated. Some shoreline erosion will occur.

ADDITIONAL DETAILS: At the San Francisco tidal gauge, high
tide is expected to be:
2.5 ft above normal (8.3 ft MLLW) at 10:26 AM Saturday 1/3
1.9 ft above normal (7.7 ft MLLW) at 11:18 AM Sunday 1/4
These predictions include up to 1.3 feet of storm 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
Take the necessary actions to protect flood-prone property. If travel is required, do not drive around barricades or through water of unknown depth. 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: Jan 3, 1:02 PM Source: NWS Alert
Minor Expected Likely

Coastal Flood Advisory

Coastal Flood Advisory issued January 2 at 10:59PM PST until January 4 at 2:00PM PST by NWS San Francisco CA
Jan 3, 2:00 PM → Jan 4, 2:00 PM
WHAT: For the Coastal Flood Warning, significant coastal
flooding expected due to high astronomical tides and storm
surge. Up to 2.5 ft of inundation above ground level is
possible in low-lying areas near shorelines and tidal
waterways during the morning high tide Saturday. For the
Coastal Flood Advisory, up to 2.0 ft inundation is
possible.

WHERE: San Francisco.

WHEN: For the Coastal Flood Warning, until 2 PM PST Saturday.
For the Coastal Flood Advisory, from 2 PM Saturday to 2 PM PST
Sunday. For the Beach Hazards Statement, from Sunday morning
through Sunday evening.

IMPACTS: Numerous roads will be closed. Low lying property
including homes, businesses, and some critical infrastructure
will be inundated. Some shoreline erosion will occur.

ADDITIONAL DETAILS: At the San Francisco tidal gauge, high
tide is expected to be:
2.5 ft above normal (8.3 ft MLLW) at 10:26 AM Saturday 1/3
1.9 ft above normal (7.7 ft MLLW) at 11:18 AM Sunday 1/4
These predictions include up to 1.3 feet of storm 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
Take the necessary actions to protect flood-prone property. If travel is required, do not drive around barricades or through water of unknown depth. 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: Jan 3, 1:02 PM Source: NWS Alert