• Tonight

    Apr 20

    Lo 46°

    Becoming cloudy; cool

    Snow Days Weather
    • Snow
      0%
    • Ice
      0%
    • Snow
      0 in
  • Tue

    Apr 21

    66°Lo 46°

    Mostly cloudy

    Very Unlikely for a snow day
    • Snow
      0%
    • Ice
      0%
    • Snow
      0 in
    more
  • Wed

    Apr 22

    67°Lo 43°

    Mostly cloudy

    Very Unlikely for a snow day
    • Snow
      0%
    • Ice
      0%
    • Snow
      0 in
    more
  • Thu

    Apr 23

    70°Lo 41°

    Partly sunny

    Very Unlikely for a snow day
    • Snow
      0%
    • Ice
      0%
    • Snow
      0 in
    more
  • Fri

    Apr 24

    66°Lo 40°

    Partly sunny and cool

    Very Unlikely for a snow day
    • Snow
      0%
    • Ice
      0%
    • Snow
      0 in
    more
Next Previous
Hi 66° RealFeel® 65° Precipitation 1%

Day

N

E

S

W

  • SSW 14 mph
  • Gusts: 23 mph

Clouds giving way to some sun

  • Max UV Index: 7 (High)
  • Thunderstorms: 1%
  • Precipitation: 0 in
  • Rain: 0 in
  • Snow: 0 in
  • Ice: 0 in
  • Hours of Precipitation: 0 hrs
  • Hours of Rain: 0 hrs
Lo 46° RealFeel® 41° Precipitation 2%

Night

N

E

S

W

  • WSW 12 mph
  • Gusts: 23 mph

Seasonably cool with increasing cloudiness

  • Max UV Index: N/A
  • Thunderstorms: 9%
  • Precipitation: 0 in
  • Rain: 0 in
  • Snow: 0 in
  • Ice: 0 in
  • Hours of Precipitation: 0 hrs
  • Hours of Rain: 0 hrs

Temperature History - Apr 20

more Historical Weather Data >
  Today Normal Record 4/20/2014
High 66° 72° 94° (2009) 83°
Low 46° 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 8:01 AM with 14:15 of moolight, then sets at 10:16 PM

Napa Weather Report

San Francisco: Clouds, Showers to Linger Ahead of Weekend

April 21, 2015; 12:20 AM ET

While cloudy conditions can be expected over the San Francisco area for the next several days, showers will not make a return until the middle of the week. more >

The 540 Snow Line

Dec 20, 2012; 5:00 AM ET The 540 line is often used by meteorologists to determine the chances of rain vs. snow.

48 Hour Precipitation Forecast

Mon. Snow Day Potential