• Early AM

    Apr 21

    Lo 46°

    Increasing clouds

    Lawn Mowing Weather
    • Hours of Precip
      0
    • Precip
      0%
    • Hi
      RealFeel
      65°
    more
  • Today

    Apr 21

    66°Lo 46°

    Mostly cloudy

    Excellent for lawn mowing
    • Hours of Precip
      0
    • Precip
      6%
    • Hi
      RealFeel
      65°
    more
  • Wed

    Apr 22

    67°Lo 43°

    Mostly cloudy

    Excellent for lawn mowing
    • Hours of Precip
      0.5
    • Precip
      25%
    • Hi
      RealFeel
      73°
    more
  • Thu

    Apr 23

    70°Lo 41°

    Partly sunny

    Excellent for lawn mowing
    • Hours of Precip
      0
    • Precip
      25%
    • Hi
      RealFeel
      71°
  • Fri

    Apr 24

    66°Lo 40°

    Partly sunny and cool

    Fair for lawn mowing
    • Hours of Precip
      0
    • Precip
      5%
    • Hi
      RealFeel
      72°
    more
Next Previous
Hi 70° RealFeel® 71° Precipitation 25%

Day

N

E

S

W

  • WSW 13 mph
  • Gusts: 23 mph

Partly sunny and seasonably cool; breezy in the afternoon

  • Max UV Index: 7 (High)
  • Thunderstorms: 20%
  • Precipitation: 0 in
  • Rain: 0 in
  • Snow: 0 in
  • Ice: 0 in
  • Hours of Precipitation: 0 hrs
  • Hours of Rain: 0 hrs
Lo 41° RealFeel® 36° Precipitation 6%

Night

N

E

S

W

  • SW 10 mph
  • Gusts: 21 mph

Partly cloudy and chilly

  • Max UV Index: N/A
  • Thunderstorms: 20%
  • 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 23

more Historical Weather Data >
  Today Normal Record 4/23/2014
High 70° 73° 92° (2013) 71°
Low 41° 46° 29° (1933) 42°

Sunrise/Sunset

Sunrise / Sunset Illustration

Rises at 6:24 AM with 13:28 of sunlight, then sets at 7:52 PM

Moonrise/Moonset

Astronomy >
Moonrise / Moonset Illustration

Rises at 9:40 AM with 14:31 of moolight, then sets at 12:11 AM

Napa Weather Report

San Francisco: Clouds, Showers to Linger Ahead of Weekend

April 21, 2015; 2:20 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 >

Why Do Leaves Change Color?

Sep 20, 2011; 5:00 AM ET Why do leaves change from green to beautiful shades of red, orange and yellow in the fall?

Thu. Degree Days

Thu. Evapotranspiration