San Francisco, California

Last updated: 9:11 PM CDT  ·  Refresh
16°C
Feels like 12°
Mostly Cloudy
▲ 17°  /  ▼ 13°
Wind
15 mph WNW
Humidity
87%
Dew Point
14°
Pressure
29.81 inHg
Visibility
4 mi
UV Index
1.4
Cloud Cover
80%
Sunrise
6:29 AM
Sunset
7:56 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: San Francisco is currently mostly cloudy at 15°C. Dry conditions are expected through the next 24 hours. Sunrise: 6:29AM · Sunset: 7:56PM.

Alerts

No active alerts for this location.
21 AQI · Good Dominant: O3 Air Quality
Hourly Forecast · Next 24 Hours
Now
16°
3%
8 PM
16°
3%
9 PM
14°
3%
10 PM
14°
3%
11 PM
14°
3%
12 AM
14°
3%
1 AM
14°
3%
2 AM
14°
3%
3 AM
14°
3%
4 AM
14°
3%
5 AM
14°
3%
6 AM
14°
3%
7 AM
14°
15%
8 AM
14°
15%
9 AM
16°
15%
10 AM
16°
3%
11 AM
16°
3%
12 PM
17°
3%
1 PM
18°
3%
2 PM
18°
3%
3 PM
18°
3%
4 PM
18°
3%
5 PM
17°
3%
6 PM
17°
3%
7-Day Forecast
Tonight
17° 13°
Mostly Cloudy.
Fri
18° 14°
Mostly Cloudy.
Sat
20° 14°
Mostly Cloudy.
Sun
19° 14°
Fog.
Mon
21° 14°
Clear.
Tue
21° 14°
Clear.
Wed
21° 14°
Clear.
TimeTempConditionsPrecipWindHumidity
Now 16° Mostly Cloudy 3% 15 mph WNW 87%
8 PM 16° Fog 3% 14 mph WNW 90%
9 PM 14° Fog 3% 14 mph WNW 91%
10 PM 14° Fog 3% 14 mph WNW 92%
11 PM 14° Fog 3% 13 mph WNW 93%
12 AM 14° Fog 3% 12 mph W 93%
1 AM 14° Fog 3% 12 mph W 93%
2 AM 14° Fog 3% 12 mph W 94%
3 AM 14° Fog 3% 11 mph W 94%
4 AM 14° Fog 3% 11 mph WNW 94%
5 AM 14° Fog 3% 11 mph WNW 94%
6 AM 14° Fog 3% 11 mph WNW 94%
7 AM 14° Overcast 15% 11 mph WNW 95%
8 AM 14° Overcast 15% 11 mph WNW 94%
9 AM 16° Overcast 15% 12 mph WNW 91%
10 AM 16° Mostly Cloudy 3% 12 mph WNW 87%
11 AM 16° Mostly Cloudy 3% 12 mph W 84%
12 PM 17° Mostly Cloudy 3% 13 mph W 83%
1 PM 18° Mostly Cloudy 3% 13 mph WNW 81%
2 PM 18° Mostly Cloudy 3% 14 mph WNW 80%
3 PM 18° Mostly Cloudy 3% 14 mph WNW 80%
4 PM 18° Partly Cloudy 3% 14 mph WNW 80%
5 PM 17° Partly Cloudy 3% 14 mph WNW 80%
6 PM 17° Partly Cloudy 3% 13 mph WNW 82%
15-Day Forecast
Today
8/20
Mostly Cloudy
3%
13°
17°
Fri
8/21
Mostly Cloudy
15%
14°
18°
Sat
8/22
Mostly Cloudy
3%
14°
20°
Sun
8/23
Fog
6%
14°
19°
Mon
8/24
Clear
5%
14°
21°
Tue
8/25
Clear
3%
14°
21°
Wed
8/26
Clear
3%
14°
21°
Thu
8/27
Clear
3%
15°
21°
Fri
8/28
Clear
3%
14°
21°
Sat
8/29
Clear
3%
14°
21°
Sun
8/30
Clear
3%
14°
22°
Mon
8/31
Clear
3%
13°
23°
Tue
9/1
Clear
3%
13°
23°
Wed
9/2
Clear
3%
14°
24°
Thu
9/3
Clear
3%
14°
24°
21
Good
U.S. Air Quality Index · Dominant: O3
50 100 150 200

Air quality is satisfactory and poses little or no health risk.

Pollutant Breakdown · Today
PM2.5
Fine particulate matter
11 AQI 2.0 µg/m³
O3
Ground-level ozone
Dominant
21 AQI 24 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 21 Good 21 11
Sat 21 Good 21 7
Sun 20 Good 20 12
About the Air Quality Index
0–50 Good
51–100 Moderate
101–150 Unhealthy for Sensitive Groups
151–200 Unhealthy
201–300 Very Unhealthy
301–500 Hazardous

The U.S. AQI runs 0–500. The overall value equals the highest individual pollutant sub-index, and the dominant pollutant is the one driving it. PM2.5 (fine particles) is reported in µg/m³ and ozone (O3) in ppb. Forecast source: NWS NAQFC.

1000850700500400300250200150100 -40-30-20-10010203040 0.41247101624 LCLLFCEL0°C Temperature (°C) Pressure (hPa)
Temp Dewpoint Parcel (SB) CAPE CIN Dry adiabat Moist adiabat Mixing ratio
RAP
Valid Thu Aug 20, 23:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 50 60 70 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE0 J/kg
MLCAPE53 J/kg
MUCAPE0 J/kg
SBCIN0 J/kg
MLCIN0 J/kg
Lifted Index12.3
Kinematics
0–6 km Shear40 kt
0–1 km Shear7 kt
Eff. Shear—
0–1 km SRH50
0–3 km SRH142
Eff. SRH—
Storm Motion237° @ 30 kt
0–1 km EHI0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)—
Supercell—
K-Index13.7
Thermo & Levels
PWAT1.08 in
0–3 km LR0.9 °C/km
700–500 LR6.7 °C/km
Total Totals33.0
LCL987 hPa
LFC1010 hPa
EL1010 hPa
Freezing Lvl16,093 ft