• Tonight

    Apr 17

    Lo 52°

    Increasing clouds

    Dust & Dander Weather
    • Grass
      Pollen
      2 - Low
    • Ragweed
      Pollen
      0 - Low
    • Tree
      Pollen
      50 - Moderate
  • Fri

    Apr 18

    68°Lo 49°

    Partly sunny

    Low indoor dust & dander levels
    • Grass
      Pollen
      2 - Low
    • Ragweed
      Pollen
      0 - Low
    • Tree
      Pollen
      50 - Moderate
    more
  • Sat

    Apr 19

    67°Lo 50°

    Mostly sunny

    Low indoor dust & dander levels
    • Grass
      Pollen
      2 - Low
    • Ragweed
      Pollen
      0 - Low
    • Tree
      Pollen
      50 - Moderate
    more
  • Sun

    Apr 20

    71°Lo 50°

    Partly sunny and pleasant

    Low indoor dust & dander levels
    • Precip
      0%
    • Wind
      Speed
      7 mph
    • Cloud
      Cover
      26%
    more
  • Mon

    Apr 21

    66°Lo 51°

    Cool with clouds and sun

    Low indoor dust & dander levels
    • Precip
      13%
    • Wind
      Speed
      7 mph
    • Cloud
      Cover
      65%
    more
Next Previous
< Previous 8 hours Next 8 hours >
  Thu
8pm
9pm 10pm 11pm Fri
12am
1am 2am 3am
  8pm 9pm 10pm 11pm 12am 1am 2am 3am
Forecast
Clear
Clear
Mostly Clear
Mostly Clear
Partly Cloudy
Partly Cloudy
Cloudy
Cloudy
Temp (°F) 63° 61° 60° 57° 56° 56° 55° 54°
RealFeel® 59° 57° 57° 55° 53° 53° 53° 52°
Humidity 48% 53% 58% 67% 72% 77% 81% 82%
   
  8pm 9pm 10pm 11pm 12am 1am 2am 3am
Rain
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
Snow
 
0%
 
0%
 
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Ice
 
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  8pm 9pm 10pm 11pm 12am 1am 2am 3am
Wind (mph) 7 NW 5 NW 5 NW 4 NW 5 NW 4 NW 4 NW 4 WNW
UV Index 0 0 0 0 0 0 0 0
Cloud Cover 0% 6% 17% 26% 32% 39% 94% 95%
Dew Point 43° 43° 45° 46° 47° 48° 49° 48°
Middle Grid line 65 F Middle Grid line 60 F Middle Grid line 55 F Middle Grid line 50 F

Temperature History - Apr 17

more Historical Weather Data >
  Today Normal Record 4/17/2013
High 70° 70° N/A 70°
Low 52° 45° N/A 51°

Sunrise/Sunset

Sunrise / Sunset Illustration

Rises at 6:31 AM with 13:14 of sunlight, then sets at 7:45 PM

Moonrise/Moonset

Astronomy >
Moonrise / Moonset Illustration

Rises at 10:34 PM with 10:25 of moolight, then sets at 8:59 AM

Top Story

Los Altos Weather Report

San Francisco: No Rain in Sight, Morning Clouds to Break for Afternoon Sunshine

April 17, 2014; 12:46 PM ET

For the remainder of the week and into the weekend, morning clouds will give way to mostly sunny skies. more >

Is it a Cold or the Flu?

Apr 7, 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?

Thu. Pollen

Thu. Dust & Dander

Thu. Wind Maps