San Francisco, California

Last updated: 12:01 AM CDT  ·  Refresh
20°C
Feels like 19°
Mostly Clear
▲ 28°  /  ▼ 17°
Wind
11 mph WSW
Humidity
86%
Dew Point
16°
Pressure
29.82 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
19%
Sunrise
6:03 AM
Sunset
8:27 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: San Francisco is currently mostly clear at 20°C. Dry conditions are expected through the next 24 hours. Sunrise: 6:03AM · Sunset: 8:27PM.

Alerts

No active alerts for this location.
52 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
20°
4%
11 PM
19°
4%
12 AM
19°
4%
1 AM
19°
6%
2 AM
18°
7%
3 AM
18°
7%
4 AM
18°
8%
5 AM
18°
8%
6 AM
17°
8%
7 AM
17°
8%
8 AM
18°
6%
9 AM
18°
7%
10 AM
19°
7%
11 AM
19°
7%
12 PM
19°
7%
1 PM
19°
7%
2 PM
22°
7%
3 PM
22°
7%
4 PM
22°
3%
5 PM
23°
3%
6 PM
21°
3%
7 PM
21°
16%
8 PM
20°
16%
9 PM
19°
17%
7-Day Forecast
Tonight
28° 17°
Mostly Clear.
Wed
23° 16°
Mostly Cloudy.
Thu
23° 15°
Haze.
Fri
24° 14°
Haze.
Sat
27° 14°
Fog.
Sun
27° 15°
Clear.
Mon
26° 15°
Clear.
TimeTempConditionsPrecipWindHumidity
Now 20° Mostly Clear 4% 11 mph WSW 86%
11 PM 19° Mostly Clear 4% 10 mph WSW 88%
12 AM 19° Mostly Clear 4% 8 mph SW 89%
1 AM 19° Mostly Clear 6% 8 mph SW 89%
2 AM 18° Partly Cloudy 7% 10 mph SW 89%
3 AM 18° Partly Cloudy 7% 10 mph SW 89%
4 AM 18° Mostly Cloudy 8% 9 mph SW 90%
5 AM 18° Mostly Cloudy 8% 9 mph SW 90%
6 AM 17° Haze 8% 9 mph SW 89%
7 AM 17° Mostly Cloudy 8% 9 mph SW 88%
8 AM 18° Mostly Cloudy 6% 9 mph SW 88%
9 AM 18° Mostly Cloudy 7% 9 mph SW 86%
10 AM 19° Mostly Cloudy 7% 10 mph SW 84%
11 AM 19° Mostly Cloudy 7% 10 mph WSW 81%
12 PM 19° Partly Cloudy 7% 11 mph WSW 80%
1 PM 19° Partly Cloudy 7% 11 mph WSW 80%
2 PM 22° Partly Cloudy 7% 12 mph WSW 79%
3 PM 22° Partly Cloudy 7% 12 mph WSW 79%
4 PM 22° Partly Cloudy 3% 12 mph W 80%
5 PM 23° Partly Cloudy 3% 12 mph W 80%
6 PM 21° Partly Cloudy 3% 12 mph W 82%
7 PM 21° Partly Cloudy 16% 11 mph W 83%
8 PM 20° Partly Cloudy 16% 11 mph W 85%
9 PM 19° Partly Cloudy 17% 10 mph W 86%
15-Day Forecast
Today
7/21
Mostly Clear
4%
17°
28°
Wed
7/22
Mostly Cloudy
8%
16°
23°
Thu
7/23
Haze
16%
15°
23°
Fri
7/24
Haze
16%
14°
24°
Sat
7/25
Fog
3%
14°
27°
Sun
7/26
Clear
3%
15°
27°
Mon
7/27
Clear
3%
15°
26°
Tue
7/28
Clear
3%
15°
26°
Wed
7/29
Clear
3%
15°
27°
Thu
7/30
Clear
19%
15°
27°
Fri
7/31
Clear
3%
16°
29°
Sat
8/1
Clear
3%
16°
31°
Sun
8/2
Clear
3%
15°
31°
Mon
8/3
Clear
3%
15°
31°
Tue
8/4
Clear
3%
15°
31°
52
Moderate
U.S. Air Quality Index · Dominant: PM2.5
50 100 150 200

Air quality is acceptable. Unusually sensitive people should consider limiting prolonged outdoor exertion.

Pollutant Breakdown · Today
PM2.5
Fine particulate matter
Dominant
52 AQI 9.5 µg/m³
O3
Ground-level ozone
24 AQI 26 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 52 Moderate 24 52
Thu 37 Good 21 37
Fri 29 Good 21 29
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 LCL0°C Temperature (°C) Pressure (hPa)
Temp Dewpoint Parcel (SB) CAPE CIN Dry adiabat Moist adiabat Mixing ratio
RAP
Valid Wed Jul 22, 03:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE0 J/kg
MLCAPE22 J/kg
MUCAPE0 J/kg
SBCIN-9862 J/kg
MLCIN0 J/kg
Lifted Index8.7
Kinematics
0–6 km Shear22 kt
0–1 km Shear16 kt
Eff. Shear—
0–1 km SRH-61
0–3 km SRH-68
Eff. SRH—
Storm Motion148° @ 24 kt
0–1 km EHI-0.0
Composite Parameters
Sig. Tornado-0.0
STP (eff)—
Supercell—
K-Index31.0
Thermo & Levels
PWAT1.57 in
0–3 km LR2.7 °C/km
700–500 LR5.8 °C/km
Total Totals41.8
LCL960 hPa
LFC—
EL—
Freezing Lvl16,608 ft