• Early AM

    Apr 20

    Lo 42°

    Partly cloudy

    Asthma Weather
    • Hi
      RealFeel
      54°
    • UV
      7 - High
    • Air Qual.
      Good
    more
  • Today

    Apr 20

    73°Lo 44°

    Partly sunny and pleasant

    Beneficial weather for asthma
    • Hi
      RealFeel
      75°
    • UV
      7 - High
    • Air Qual.
      Good
  • Mon

    Apr 21

    65°Lo 43°

    Clouds and sun; not as warm

    Beneficial weather for asthma
    • Hi
      RealFeel
      65°
    • UV
      6 - High
    • Air Qual.
      Good
    more
  • Tue

    Apr 22

    63°Lo 39°

    Mostly cloudy with a shower

    Beneficial weather for asthma
    • Hi
      RealFeel
      59°
    • UV
      6 - High
    • Cloud
      Cover
      76%
    more
  • Wed

    Apr 23

    67°Lo 46°

    Partly sunny and cool

    Beneficial weather for asthma
    • Hi
      RealFeel
      69°
    • UV
      7 - High
    • Cloud
      Cover
      28%
    more
Next Previous
< Previous 8 hours Next 8 hours >
  Sun
4am
5am 6am 7am 8am 9am 10am 11am
  4am 5am 6am 7am 8am 9am 10am 11am
Forecast
Mostly Clear
Mostly Clear
Mostly Clear
Mostly Sunny
Partly Sunny
Mostly Sunny
Mostly Sunny
Mostly Sunny
Temp (°F) 46° 44° 42° 42° 47° 50° 52° 57°
RealFeel® 45° 44° 42° 42° 49° 54° 59° 67°
Humidity 96% 94% 97% 100% 100% 93% 83% 75%
   
  4am 5am 6am 7am 8am 9am 10am 11am
Rain
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
Snow
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
Ice
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
 
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0%
   
  4am 5am 6am 7am 8am 9am 10am 11am
Wind (mph) 3 NW 2 NW 2 NW 2 NNW 2 NNW 3 NNW 3 NW 3 WNW
UV Index 0 0 0 0 1 2 4 5
Cloud Cover 28% 28% 27% 26% 37% 27% 26% 26%
Dew Point 44° 43° 41° 42° 47° 48° 47° 49°
Middle Grid line 60 F Middle Grid line 55 F Middle Grid line 50 F Middle Grid line 45 F Middle Grid line 40 F

Temperature History - Apr 20

more Historical Weather Data >
  Today Normal Record 4/20/2013
High 73° 72° 94° (2009) 82°
Low 44° 46° 29° (1933) 46°

Sunrise/Sunset

Sunrise / Sunset Illustration

Rises at 6:27 AM with 13:23 of sunlight, then sets at 7:50 PM

Moonrise/Moonset

Astronomy >
Moonrise / Moonset Illustration

Rises at 12:33 AM with 10:21 of moolight, then sets at 10:54 AM

Top Story

Napa Weather Report

Chance of Rain in San Francisco on Tuesday

April 20, 2014; 4:09 AM ET

There hasn't been any measurable precipitation in San Francisco since April 4. more >

Is it a Cold or the Flu?

Apr 19, 2014; 5:00 AM ET Symptoms caused by the common cold can often resemble those associated with the influenza virus, so how do you differentiate between the two?

Sun. Air Quality

Sun. Asthma Risk

Sun. UV Index