• Tonight

    Apr 20

    Lo 47°

    Becoming cloudy

    Asthma Weather
    • Hi
      RealFeel
      57°
    • UV
      4 - Moderate
    • Air Qual.
      Good
    more
  • Tue

    Apr 21

    56°Lo 48°

    Mostly cloudy

    Neutral weather for asthma
    • Hi
      RealFeel
      54°
    • UV
      4 - Moderate
    • Air Qual.
      Good
  • Wed

    Apr 22

    58°Lo 46°

    Low clouds, then some sun

    Neutral weather for asthma
    • Hi
      RealFeel
      62°
    • UV
      6 - High
    • Air Qual.
      Good
    more
  • Thu

    Apr 23

    57°Lo 47°

    Partly sunny

    At Risk weather for asthma
    • Hi
      RealFeel
      54°
    • UV
      8 - Very High
    • Cloud
      Cover
      28%
    more
  • Fri

    Apr 24

    56°Lo 46°

    Cool with partial sunshine

    Beneficial weather for asthma
    • Hi
      RealFeel
      54°
    • UV
      7 - High
    • Cloud
      Cover
      45%
    more
Next Previous
Hi 56° RealFeel® 54° Precipitation 9%

Day

N

E

S

W

  • WSW 9 mph
  • Gusts: 16 mph

Mostly cloudy

  • Max UV Index: 4 (Moderate)
  • Thunderstorms: 6%
  • Precipitation: 0 in
  • Rain: 0 in
  • Snow: 0 in
  • Ice: 0 in
  • Hours of Precipitation: 0 hrs
  • Hours of Rain: 0 hrs
Lo 48° RealFeel® 43° Precipitation 4%

Night

N

E

S

W

  • SW 9 mph
  • Gusts: 14 mph

Mostly cloudy

  • Max UV Index: N/A
  • Thunderstorms: 2%
  • 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 21

more Historical Weather Data >
  Today Normal Record 4/21/2014
High 56° 61° N/A 59°
Low 48° 44° N/A 39°

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 8:51 AM with 14:24 of moolight, then sets at 11:15 PM

Half Moon Bay Weather Report

San Francisco: Clouds, Showers to Linger Ahead of Weekend

April 20, 2015; 11:04 PM 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 Dangers of Bus Travel

Dec 10, 2012; 5:00 AM ET While bus transportation is one of the most affordable, it is important to know which motor coach companies rank highest in safety.

Tue. Air Quality

Tue. Asthma Risk

Tue. UV Index