• Tonight

    Aug 21

    Lo 58°

    Increasing cloudiness

    Ragweed Pollen Weather
    • Grass
      Pollen
      2 - Low
    • Ragweed
      Pollen
      5 - Low
    • Tree
      Pollen
      7 - Low
  • Fri

    Aug 22

    70°Lo 57°

    Low clouds, then sun

    Low ragweed pollen levels
    • Grass
      Pollen
      2 - Low
    • Ragweed
      Pollen
      5 - Low
    • Tree
      Pollen
      7 - Low
    more
  • Sat

    Aug 23

    71°Lo 57°

    Low clouds, then some sun

    Low ragweed pollen levels
    • Grass
      Pollen
      2 - Low
    • Ragweed
      Pollen
      5 - Low
    • Tree
      Pollen
      7 - Low
    more
  • Sun

    Aug 24

    71°Lo 57°

    Low clouds, then sunshine

    Low ragweed pollen levels
    • Precip
      1%
    • Wind
      Speed
      6 mph
    • Cloud
      Cover
      57%
    more
  • Mon

    Aug 25

    71°Lo 57°

    Partly sunny

    Ragweed Pollen Weather
    • Precip
      1%
    • Wind
      Speed
      7 mph
    • Cloud
      Cover
      26%
    more
Next Previous
Hi 69° RealFeel® 71° Precipitation 0%

Day

N

E

S

W

  • WNW 7 mph
  • Gusts: 15 mph

Sunny to partly cloudy

  • Max UV Index: 8 (Very High)
  • 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 58° RealFeel® 54° Precipitation 1%

Night

N

E

S

W

  • W 6 mph
  • Gusts: 10 mph

Mainly clear this evening followed by low clouds late

  • Max UV Index: N/A
  • Thunderstorms: 1%
  • Precipitation: 0 in
  • Rain: 0 in
  • Snow: 0 in
  • Ice: 0 in
  • Hours of Precipitation: 0 hrs
  • Hours of Rain: 0 hrs

San Francisco Pollen Levels - August 21

  • Extreme
  • Very High
  • High
  • Moderate
  • Low
  • Grass

    Pollen

    Low

  • Weed

    Pollen

    Low

  • Tree

    Pollen

    Low

  • Mold

    Pollen

    Low

Temperature History - Aug 21

more Historical Weather Data >
  Today Normal Record 8/21/2013
High 69° 69° 88° (1891) 66°
Low 58° 55° 47° (1898) 57°

Sunrise/Sunset

Sunrise / Sunset Illustration

Rises at 6:30 AM with 13:25 of sunlight, then sets at 7:55 PM

Moonrise/Moonset

Astronomy >
Moonrise / Moonset Illustration

Rises at 3:08 AM with 14:18 of moolight, then sets at 5:26 PM

Top Story

San Francisco Weather Report

Firefighters Race to Contain Blaze Near Yosemite

August 21, 2014; 12:45 PM ET

All evacuation orders were lifted as containment increased early Wednesday. more >

Thu. Pollen

Thu. Dust & Dander

Thu. Wind Maps