• Today

    May 25

    68°Lo 55°

    Cool with clouds breaking

    Low ragweed pollen levels
    • Grass
      Pollen
      1 - Low
    • Ragweed
      Pollen
      1 - Low
    • Tree
      Pollen
      1 - Low
  • Thu

    May 26

    73°Lo 52°

    Clouds giving way to sun

    Low ragweed pollen levels
    • Grass
      Pollen
      1 - Low
    • Ragweed
      Pollen
      1 - Low
    • Tree
      Pollen
      1 - Low
    more
  • Fri

    May 27

    78°Lo 51°

    Turning sunny; nice

    Moderate ragweed pollen levels
    • Grass
      Pollen
      5 - High
    • Ragweed
      Pollen
      3 - Moderate
    • Tree
      Pollen
      1 - Low
    more
  • Sat

    May 28

    80°Lo 51°

    Low clouds, then sun

    Low ragweed pollen levels
    • Grass
      Pollen
      1 - Low
    • Ragweed
      Pollen
      1 - Low
    • Tree
      Pollen
      1 - Low
    more
  • Sun

    May 29

    79°Lo 53°

    Low clouds, then sunshine

    Low ragweed pollen levels
    • Grass
      Pollen
      1 - Low
    • Ragweed
      Pollen
      1 - Low
    • Tree
      Pollen
      1 - Low
    more
Next Previous
< Previous 8 hours Next 8 hours >
  Wed
2am
3am 4am 5am 6am 7am 8am 9am
  2am 3am 4am 5am 6am 7am 8am 9am
Forecast
Cloudy
Cloudy
Cloudy
Cloudy
Cloudy
Cloudy
Cloudy
Mostly Cloudy
Temp (°F) 56° 55° 55° 55° 56° 56° 58° 60°
RealFeel® 54° 53° 55° 55° 56° 57° 60° 63°
Humidity 74% 72% 71% 68% 63% 59% 53% 49%
   
  2am 3am 4am 5am 6am 7am 8am 9am
Rain
 
1%
 
1%
 
1%
 
1%
 
1%
 
1%
 
0%
 
0%
Snow
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
Ice
 
0%
 
0%
 
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  2am 3am 4am 5am 6am 7am 8am 9am
Wind (mph) 6 WNW 6 WSW 5 NNW 5 NNW 5 NW 4 NW 4 NNW 5 NNW
UV Index 0 0 0 0 0 0 1 1
Cloud Cover 99% 99% 99% 95% 94% 94% 95% 83%
Dew Point 48° 47° 46° 45° 44° 42° 41° 41°
Middle Grid line 65 F Middle Grid line 60 F Middle Grid line 55 F Middle Grid line 50 F

Temperature History - May 25

more Historical Weather Data >
  Today Normal Record 5/25/2015
High 68° 76° N/A 66°
Low 55° 50° N/A 55°

Sunrise/Sunset

Sunrise / Sunset Illustration

Rises at 5:52 AM with 14:27 of sunlight, then sets at 8:19 PM

Moonrise/Moonset

Astronomy >
Moonrise / Moonset Illustration

Rises at 11:35 PM with 10:34 of moolight, then sets at 10:09 AM

Los Altos Weather Report

San Francisco: Milder air to build ahead of Memorial Day weekend

May 25, 2016; 8:22 AM ET

Following a stretch of cool days, milder air will begin to build across the Bay area heading into Memorial Day weekend. more >

Wed. Pollen

Wed. Dust & Dander

Wed. Wind Maps