• Early AM

    Apr 21

    Lo 42°

    Partly cloudy

    Dust & Dander Weather
    • Grass
      Pollen
      2 - Low
    • Ragweed
      Pollen
      0 - Low
    • Tree
      Pollen
      50 - Moderate
    more
  • Today

    Apr 21

    73°Lo 47°

    Mostly sunny

    Moderate indoor dust & dander levels
    • Grass
      Pollen
      2 - Low
    • Ragweed
      Pollen
      0 - Low
    • Tree
      Pollen
      50 - Moderate
  • Tue

    Apr 22

    75°Lo 46°

    Partly sunny and breezy

    Low indoor dust & dander levels
    • Grass
      Pollen
      2 - Low
    • Ragweed
      Pollen
      0 - Low
    • Tree
      Pollen
      50 - Moderate
    more
  • Wed

    Apr 23

    68°Lo 34°

    Mostly sunny and not as warm

    High indoor dust & dander levels
    • Precip
      12%
    • Wind
      Speed
      15 mph
    • Cloud
      Cover
      18%
    more
  • Thu

    Apr 24

    69°Lo 38°

    Plenty of sunshine

    Very High indoor dust & dander levels
    • Precip
      2%
    • Wind
      Speed
      9 mph
    • Cloud
      Cover
      10%
    more
Next Previous
Hi 73° RealFeel® 81° Precipitation 5%

Day

N

E

S

W

  • SW 4 mph
  • Gusts: 7 mph

Mostly sunny

  • Max UV Index: 10 (Extreme)
  • Thunderstorms: 24%
  • Precipitation: 0 in
  • Rain: 0 in
  • Snow: 0 in
  • Ice: 0 in
  • Hours of Precipitation: 0 hrs
  • Hours of Rain: 0 hrs
Lo 47° RealFeel® 45° Precipitation 3%

Night

N

E

S

W

  • SSE 5 mph
  • Gusts: 9 mph

Clear

  • Max UV Index: N/A
  • Thunderstorms: 24%
  • Precipitation: 0 in
  • Rain: 0 in
  • Snow: 0 in
  • Ice: 0 in
  • Hours of Precipitation: 0 hrs
  • Hours of Rain: 0 hrs

San Mateo Pollen Levels - April 21

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

    Pollen

    Low

  • Weed

    Pollen

    Low

  • Tree

    Pollen

    Moderate

  • Mold

    Pollen

    Low

Temperature History - Apr 21

more Historical Weather Data >
  Today Normal Record 4/21/2013
High 73° 71° 89° (1989) 75°
Low 47° 45° 29° (1972) 36°

Sunrise/Sunset

Sunrise / Sunset Illustration

Rises at 6:32 AM with 13:15 of sunlight, then sets at 7:47 PM

Moonrise/Moonset

Astronomy >
Moonrise / Moonset Illustration

Rises at 12:25 AM with 10:35 of moolight, then sets at 11:00 AM

Is it a Cold or the Flu?

Apr 19, 2014; 5:00 AM ET Symptoms caused by the common cold can often resemble those associated with the influenza virus, so how do you differentiate between the two?

Mon. Pollen

Mon. Dust & Dander

Mon. Wind Maps