Storm Station
Half Moon Bay, California
58°
Partly cloudy· Feels like 58°·Light breeze 4 mph WNW
A slight chance of drizzle. Cloudy, with a low around 53. West northwest wind around 3 mph. Chance of precipitation is 20%.
-UV
-Air quality
88%Humidity
67%Cloud

What is measuring near here

The 4 instruments nearest Half Moon Bay, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.2 miles away.

measured now2 instruments

Half Moon BayHAF

At an airfield/5.0 mi away/31 ft/34 ft below here

temp, wind, gust, visibility, precip, pressure

Rank1of 3,115

Spring Vly RAWSHSPC1

A remote fire weather station/7.0 mi away/1,030 ft/965 ft above here

temp, wind, gust, humidity, pressure

Rank585of 3,115

measured daily2 instruments

Half Moon Bay 0.8 SCA-SM-12

In a volunteer observer's own ground/0.2 mi away/70 ft/5 ft above here

precip, snowfall, snow depth

Rank-

Half Moon BayHMBC1

At a cooperative observer's station/0.9 mi away/23 ft/42 ft below here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at Half Moon Bay, drawn

The nearest airport reporting now, 5.0 mi from Half Moon Bay. From its report of Sep 27, 2026, 1:15 AM local time: 3 of its 5 sheets.

The sky

Overcast at 1,400 ft; the ceiling is 1,400 ft; visibility 6 mi.

Section of the sky over Half Moon Bay, height above the station to scale: overcast cloud with its base at 1,400 feet, the ceiling at 1,400 feet, and visibility of 6 mi.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT HAFFIG. A THE SKY OVER HALF MOON BAYSECTION, HEIGHT ABOVE THE STATION TO SCALE, EACH LAYER AT THE HEIGHT OF ITS BASE AS REPORTED; COVER IN EIGHTHS OF THE SKY; TOPS NOT MEASUREDFT ABOVE THE STATION05001,0001,5002,0002,5003,000ETAGESLOWTHE STATIONTHE CEILOMETER READS TO 12,000 FT, ABOVE THIS SHEETOVC 1,400 FTOVERCAST, 8 EIGHTHS OF THE SKYCEILING 1,400 FTVISIBILITY, MILES: 6 MI0510TITLEHalf Moon Bay, the skySTATION REPORT · ASOS HAFTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 5DATE2026-09-27IDSR-HAF-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-017, FB-SKY-016, FB-SKY-018

The air

59.0 F with a dew point of 55.4 F, 88 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 800 ft up; the lowest cloud reported is at 1,400 ft.

Chart of the air at Half Moon Bay: temperature 59.0 degrees Fahrenheit and dew point 55.4, 88 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 800 feet above the station, against the lowest cloud reported at 1,400 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT HAFFIG. B THE AIR AT HALF MOON BAYTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,00040 F50 F60 F70 FSATURATES 800 FT ABOVE THE STATION, AT 54.6 FLOWEST CLOUD REPORTED, OVC 1,400 FTTEMPERATURE 59.0 FDEW POINT 55.4 FSPREAD 3.6 FRELATIVE HUMIDITY 88 PER CENTTHE AIR COOLS ABOUT 5.4 F EACH 1,000 FT IT RISES, AND ITS DEW POINT ABOUT 1 FSOLID: THE LIFTED AIR'S TEMPERATURE; DASHED: ITS DEW POINTTITLEHalf Moon Bay, the airSTATION REPORT · ASOS HAFTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 5DATE2026-09-27IDSR-HAF-2DRAWN AS linework on paperSOURCES FB-WAT-020, FB-WAT-002, FB-ENG-011, FB-ENG-005

The column

At 31 ft above sea level, 0 per cent of the atmosphere's air lies below the station. The standard atmosphere puts the pressure there at 29.89 inHg and the temperature at 58.9 F; the station's altimeter setting of 29.93 inHg means its barometer reads 29.90 inHg; it reports 59.0 F, 0.1 F warmer than standard.

Section from sea level of where Half Moon Bay stands in the atmosphere, height to scale: the station 31 feet above sea level with 0 per cent of the air below it; the standard atmosphere's pressure there, 29.89 inches of mercury, and temperature, 58.9 degrees Fahrenheit; the altimeter setting of 29.93 and the station pressure it means, 29.90.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT HAFFIG. D WHERE HALF MOON BAY STANDS IN THE ATMOSPHERESECTION FROM SEA LEVEL, HEIGHT TO SCALE, THE STATION IN THE STANDARD ATMOSPHEREFT ABOVE SEA LEVEL05,00010,00015,000SEA LEVEL, 29.92 inHg IN THE STANDARD ATMOSPHEREHALF MOON BAY0 PER CENT OF THE AIR BELOW IT31 FT10 PER CENT OF THE AIR BELOW, 2,890 FT20 PER CENT OF THE AIR BELOW, 6,050 FT30 PER CENT OF THE AIR BELOW, 9,540 FT40 PER CENT OF THE AIR BELOW, 13,470 FTSTANDARD PRESSURE HERE29.89 inHgSTANDARD TEMPERATURE HERE58.9 FALTIMETER SETTING, REPORTED29.93 inHgITS BAROMETER READS29.90 inHgTEMPERATURE, REPORTED59.0 FTITLEHalf Moon Bay, the columnSTATION REPORT · ASOS HAFTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 3 of 5DATE2026-09-27IDSR-HAF-3DRAWN AS linework on paperSOURCES FB-ENG-001, FB-ENG-003

The full report of Half Moon Bay, in 5 sheets, each beside the Field Book plates that explain it

-in

Snow on the ground

Elsewhere in California

33 places, each with its own forecast and its own instruments.

Near Half Moon Bay

The nearest places, each with its own forecast and the instruments nearest it.