Temperature
50 F at 1 AM; 84 F at its warmest, 1 PM Thursday, and 43 F at its coolest, 7 AM Thursday.
- Now
- 50F
- 1 AM
- Highest
- 84F
- 1 PM Thursday
- Lowest
- 43F
- 7 AM Thursday
How it is measured: Stevenson screen and siting, Field Book FB-INS-009
Airports/California/Half Moon Bay Airport
Half Moon Bay Airport, California
Small airport in San Mateo County, California55°
76°/57°
Clear·
Feels like 55°·Calm 0 mph ESE
Now. Half Moon Bay Airport is 55° and clear at 1 AM. The dew point is 45°, so the air feels dry and comfortable. The air is calm.
Today and tonight. It warms to about 74° by 3 PM. Tonight falls to about 58° by 8 AM, under a mostly clear sky. No rain is expected for the rest of the day. The sun is strong around midday: UV index 6, high. Unprotected skin can burn in under half an hour.
The week. The warmest day ahead is tomorrow, near 71°, and the coolest Monday, near 59°. Rain is possible Tuesday (41%).
The sky tonight. The sun sets at 6:31 PM. The Moon is a waxing crescent, 34% lit, and sets at 10:40 PM. The next full Moon is Sunday, Oct 25. After dark, look for Saturn, bright in the east-southeast. A planet shines with a steady light where the stars around it twinkle. The Orionids meteor shower is active, peaking around Oct 21: at its peak, up to about 20 meteors an hour can be seen from a dark site. The sky is forecast to stay clear: a good night to look up. The day is 11 hours 13 minutes long, 2 minutes shorter than yesterday.
0UV Low
42Air quality
80%Humidity
0%Cloud
Now
1:00 AM
55feels55
now, clear
Today
Oct 16
7657
UV 6
Sat
Oct 17
7158
UV 6
Sun
Oct 18
6154
13mph
Mon
Oct 19
5951
28%
13mph
Tue
Oct 20
6051
41%
Wed
Oct 21
6351
27%
Thu
Oct 22
6152
partly cloudy day
55°
76°57°
71°58°
61°54°
59°51°
60°51°
63°51°
61°52°
As of 1:00 AM in Half Moon Bay Airport, California.
Air quality
The air at Half Moon Bay Airport
Index 42, good, led by fine particles. Read at 1 AM from its reporting area, Redwood City (CA), 15 miles off.
42Good
- Fine particles (PM2.5)42Good16.4 mi
- Ozone16Good15 ppb16.4 mi
- Nitrogen dioxide12Good13.3 ppb16.4 mi
- Sulfur dioxide0Good0.2 ppb24.2 mi
- Carbon monoxide-0.3 ppm16.4 mi
The days ahead
Good each day through Tue Oct 20, led by ozone. Yesterday measured 46, good.
GoodModerate
- 46YesterdayOct 15
- 43TodayOct 16
- GoodSatOct 17
- GoodSunOct 18
- GoodMonOct 19
- GoodTueOct 20
Smoke, the next 41 hours
Little smoke near the ground through Sat 5 PM: the index from smoke stays at 6 or under.
Precipitation
What has fallen at Half Moon Bay Airport
None in the last 3 days, to Fri 12 AM. Measured by radar and rain gauges, as water.
- Last 24 hours
- 0.00in
- Last 3 days
- 0.00in
Visibility
How far you can see at Half Moon Bay Airport, the next 41 hours
Visibility stays 8 miles or more through Sat 5 PM, lowest 9 miles Sat 5 AM.
F
Now, today, and the week
Weather instrument stations by state
Airfield
- Code
- HAF
- ICAO
- KHAF
- IATA
- HAF
- Field elevation
- 66 ft
- Serves
- Half Moon Bay
- Kind
- Small airport
- Scheduled service
- No
- Its own instrument
- HAF
- Wind now
- Calm, read 16 Oct, 01:15
Runways
| Runway | Length | Width | Surface | Heading, true | Wind along it now | Crosswind now |
|---|---|---|---|---|---|---|
| 12 / 30 | 5,000 ft | 150 ft | Asphalt | 137° / 317° | Calm | Calm |
Measured here
What the airfield's own instrument measured, the last 24 hours
Every hour from Half Moon Bay (HAF), Half Moon Bay Airport's own instrument, measure by measure, on the field's own clock.
Humidity and dew point
A dew point of 45 F, the air 82% saturated; the humidity ran from 18% at 1 PM Thursday to 98% at 6 AM Thursday.
- Dew point now
- 45F
- 1 AM
- Humidity now
- 82%
- Humidity, range
- 18 to 98%
How it is measured: Humidity variables, Field Book FB-WAT-002
Wind
2 mph from the north northeast at 1 AM; at its strongest 16 mph, 1 PM Thursday, with a gust of 22 mph at 5 PM Thursday.
- Now
- 2mph
- from the north northeast
- Strongest
- 16mph
- 1 PM Thursday
- Highest gust
- 22mph
- 5 PM Thursday
How it is measured: Coriolis as geometry, Field Book FB-ENG-008
Pressure
30.06 inHg at 1 AM, steady over 3 hours; 0.06 inHg lower than a day before.
- Now
- 30.06inHg
- 1 AM
- 3 hours
- -0.01inHg
- steady
- 24 hours
- -0.06inHg
How it is measured: Hydrostatic balance, Field Book FB-ENG-003
Visibility
Down to 4 miles at 8 AM Thursday; 9 miles now.
- Now
- 9mi
- Lowest
- 4mi
- 8 AM Thursday
- Hours under a mile
- 0
How it is measured: Fog types, Field Book FB-WAT-020
Cloud base
The lowest cloud base came down to 200 ft at 7 AM Thursday; a base was reported in 5 of the hours.
- Lowest base now
- -
- Lowest in 24 hours
- 200ft
- 7 AM Thursday
- Hours with a base reported
- 5
How it is measured: Cloud classification, Field Book FB-SKY-001
Precipitation
None measured in the gauge in the last 24 hours.
- Last 24 hours
- 0.00in
- Wettest hour
- -
- Hours with some
- 0
How it is measured: ASOS, Field Book FB-INS-002
Half Moon Bay: every reading, the last 7 days, 30 days and the year, and how well it reports
What is measuring near here
The 4 instruments nearest Half Moon Bay Airport, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.1 miles away.
measured now2 instruments
At an airfield/0.1 mi away/31 ft/35 ft below here
temp, wind, gust, visibility, precip, pressure
Spring Vly RAWSHSPC1
A remote fire weather station/4.9 mi away/1,030 ft/964 ft above here
temp, wind, gust, humidity, pressure
measured daily2 instruments
El Granada 0.4 WSWCA-SM-44
In a volunteer observer's own ground/1.6 mi away/141 ft/75 ft above here
precip, snowfall, snow depth
Half Moon BayHMBC1
At a cooperative observer's station/4.2 mi away/23 ft/43 ft below here
snowfall, snow depth, precip, high, low
What the snow tracker reads here
Every instrument in this state
-
Snow on the ground
Elsewhere in California
33 places, each with its own forecast and its own instruments.
Big Bear Mountainski areaBishopcityBridgeporttownChina Peakski areaDodge Ridgeski areaDonner PassfeatureFresnocityHeavenlysurveyed ski areaHomewoodski areaJune Mountainski areaKirkwoodsurveyed ski areaLos AngelescityMammoth LakestownMammoth Mountainsurveyed ski areaMount ShastafeatureMount Shasta CitycityMount Shasta Ski Parkski areaMount WhitneyfeatureMountain Highski areaNorthstarsurveyed ski areaPalisades Tahoesurveyed ski areaReddingcitySacramentocitySan DiegocitySan FranciscocitySierra NevadafeatureSierra-at-Tahoeski areaSnow Valleyski areaSouth Lake TahoecitySugar Bowlski areaSusanvillecityTruckeetownYosemitefeature
Near Half Moon Bay Airport
The nearest places, each with its own forecast and the instruments nearest it.
- Moss Beachcommunity, 1 mi
- El Granadacommunity, 2 mi
- Montaracommunity, 2 mi
- Half Moon Baycity, 5 mi
- Pacificacity, 8 mi
- Millbraecity, 8 mi
- Highlandscommunity, 8 mi
- Hillsboroughtown, 8 mi
- San Brunocity, 9 mi
- Burlingamecity, 9 mi
- Baywood Parkcommunity, 9 mi
- South San Franciscocity, 11 mi
Airports near Half Moon Bay Airport
- San Francisco International AirportSFO, 10 mi
- San Carlos AirportSQL, 14 mi
- Oakland San Francisco Bay AirportOAK, 21 mi
- Palo Alto AirportPAO, 21 mi
- Hayward Executive AirportHWD, 23 mi
- Moffett Federal AirfieldNUQ, 26 mi
- Mineta San Jose International AirportSJC, 33 mi
- Livermore Municipal AirportLVK, 39 mi