• Today

    Dec 18

    60°Lo 53°

    Mostly cloudy

    Poor for home energy
    • Avg
      RealFeel
      54°
    • Hi
      RealFeel
      59°
    • Wind
      Speed
      6 mph
    more
  • Fri

    Dec 19

    61°Lo 50°

    Mostly cloudy, a little rain

    Poor for home energy
    • Avg
      RealFeel
      54°
    • Hi
      RealFeel
      58°
    • Wind
      Speed
      7 mph
    more
  • Sat

    Dec 20

    60°Lo 51°

    Mostly cloudy

    Poor for home energy
    • Avg
      RealFeel
      55°
    • Hi
      RealFeel
      61°
    • Wind
      Speed
      4 mph
  • Sun

    Dec 21

    63°Lo 52°

    Turning cloudy

    Poor for home energy
    • Avg
      RealFeel
      56°
    • Hi
      RealFeel
      62°
    • Wind
      Speed
      6 mph
    more
  • Mon

    Dec 22

    63°Lo 50°

    Mostly sunny

    Poor for home energy
    • Avg
      RealFeel
      56°
    • Hi
      RealFeel
      62°
    • Wind
      Speed
      6 mph
    more
Next Previous
Hi 60° RealFeel® 61° Precipitation 25%

Day

N

E

S

W

  • NW 4 mph
  • Gusts: 6 mph

Mostly cloudy

  • Max UV Index: 1 (Low)
  • Thunderstorms: 0%
  • Precipitation: 0 in
  • Rain: 0 in
  • Snow: 0 in
  • Ice: 0 in
  • Hours of Precipitation: 0 hrs
  • Hours of Rain: 0 hrs
Lo 51° RealFeel® 49° Precipitation 55%

Night

N

E

S

W

  • W 4 mph
  • Gusts: 6 mph

A passing shower in the evening; otherwise, low clouds

  • Max UV Index: N/A
  • Thunderstorms: 20%
  • Precipitation: 0.02 in
  • Rain: 0.02 in
  • Snow: 0 in
  • Ice: 0 in
  • Hours of Precipitation: 0.5 hrs
  • Hours of Rain: 0.5 hrs

Temperature History - Dec 20

more Historical Weather Data >
  Today Normal Record 12/20/2013
High 60° 58° N/A 59°
Low 51° 42° N/A 37°

Sunrise/Sunset

Sunrise / Sunset Illustration

Rises at 7:20 AM with 9:34 of sunlight, then sets at 4:54 PM

Moonrise/Moonset

Astronomy >
Moonrise / Moonset Illustration

Rises at 5:43 AM with 10:25 of moolight, then sets at 4:08 PM

Foster City Weather Report

San Francisco: Dry Weather Ahead for the Weekend

December 18, 2014; 12:34 PM ET

Conditions will turn dry for San Francisco this weekend and last into next week. more >

Energy Efficient Lightbulbs and S.A.D

Sep 8, 2012; 5:00 AM ET With shorter days and colder nights in the fall and winter, some people develop seasonal affective disorder. When shopping for lightbulbs to treat the 'winter blues,'consider energy-efficient bulbs.

Sat. Home Energy Efficiency

Sat. Degree Days

Sat. UV Index