• Early AM

    Apr 21

    Lo 51°

    Increasing clouds

    Migraine Headache Weather
    • Hi
      RealFeel
      61°
    • UV
      8 - Very High
    • Cloud
      Cover
      26%
    more
  • Today

    Apr 21

    69°Lo 53°

    Partly sunny and not as warm

    Beneficial weather for migraines
    • Hi
      RealFeel
      73°
    • UV
      7 - High
    • Cloud
      Cover
      43%
  • Tue

    Apr 22

    62°Lo 46°

    Mostly cloudy with a shower

    Beneficial weather for migraines
    • Hi
      RealFeel
      64°
    • UV
      6 - High
    • Cloud
      Cover
      76%
    more
  • Wed

    Apr 23

    67°Lo 49°

    Mostly sunny and cool

    Beneficial weather for migraines
    • Hi
      RealFeel
      71°
    • UV
      8 - Very High
    • Cloud
      Cover
      19%
    more
  • Thu

    Apr 24

    67°Lo 53°

    Periods of sun

    Beneficial weather for migraines
    • Hi
      RealFeel
      69°
    • UV
      7 - High
    • Cloud
      Cover
      69%
    more
Next Previous
Next 8 hours >
  Mon
12am
1am 2am 3am 4am 5am 6am 7am
  12am 1am 2am 3am 4am 5am 6am 7am
Forecast
Mostly Clear
Clear
Clear
Clear
Partly Cloudy
Cloudy
Cloudy
Partly Cloudy
Temp (°F) 57° 56° 57° 54° 53° 53° 51° 52°
RealFeel® 55° 54° 58° 55° 54° 54° 52° 52°
Humidity 67% 69% 67% 74% 76% 79% 83% 86%
   
  12am 1am 2am 3am 4am 5am 6am 7am
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%
 
0%
 
0%
   
  12am 1am 2am 3am 4am 5am 6am 7am
Wind (mph) 4 NNE 4 NE 0 0 0 0 0 1 N
UV Index 0 0 0 0 0 0 0 0
Cloud Cover 25% 0% 0% 0% 31% 57% 69% 63%
Dew Point 46° 46° 46° 46° 46° 46° 46° 48°
Middle Grid line 60 F Middle Grid line 55 F Middle Grid line 50 F

Temperature History - Apr 21

more Historical Weather Data >
  Today Normal Record 4/21/2013
High 69° 71° N/A 84°
Low 53° 45° N/A 48°

Sunrise/Sunset

Sunrise / Sunset Illustration

Rises at 6:26 AM with 13:23 of sunlight, then sets at 7:49 PM

Moonrise/Moonset

Astronomy >
Moonrise / Moonset Illustration

Rises at 1:22 AM with 10:38 of moolight, then sets at 12:00 PM

Top Story

Los Altos Weather Report

Chance of Rain in San Francisco on Tuesday

April 21, 2014; 4:56 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?

Mon. Migraine Headache

Mon. UV Index