Storm Station
Alum Rock, California
65°
Mostly clear· Feels like 65°·Light air 4 mph NW
Mostly cloudy, with a low around 55. South wind around 2 mph.
-UV
-Air quality
63%Humidity
21%Cloud

What is measuring near here

The 4 instruments nearest Alum Rock, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 1.6 miles away.

measured now2 instruments

San Jose RAWSRJSC1

A remote fire weather station/2.3 mi away/863 ft/705 ft above here

temp, wind, gust, humidity, pressure

Rank179of 3,115

San Jose/Reid/HillvRHV

At an airfield/2.6 mi away/135 ft/23 ft below here

temp, wind, gust, visibility, precip, pressure

Rank3,103of 3,115

measured daily2 instruments

San Jose 6.0 NCA-SC-78

In a volunteer observer's own ground/1.6 mi away/237 ft/79 ft above here

precip, snowfall, snow depth

Rank-

Mount HamiltonMHAC1

At a cooperative observer's station/10.1 mi away/3,764 ft/3,606 ft above here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at San Jose RAWS, drawn

The nearest instrument reporting now, 2.3 mi from Alum Rock. From its report of Sep 27, 2026, 12:52 AM local time: 3 of its 5 sheets.

The air

53.0 F with a dew point of 47.6 F, 82 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 1,200 ft up.

Chart of the air at San Jose RAWS: temperature 53.0 degrees Fahrenheit and dew point 47.6, 82 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 1,200 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT RJSC1FIG. B THE AIR AT SAN JOSE RAWSTHE 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 FSATURATES 1,200 FT ABOVE THE STATION, AT 46.4 FTEMPERATURE 53.0 FDEW POINT 47.6 FSPREAD 5.4 FRELATIVE HUMIDITY 82 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 POINTTITLESan Jose RAWS, the airSTATION REPORT · DCP RJSC1TYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 5DATE2026-09-27IDSR-RJSC1-1DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

Calm.

Plan of the wind at San Jose RAWS, north up: calm; beside it the Beaufort scale from calm to hurricane force, force 0, calm, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT RJSC1FIG. C THE WIND AT SAN JOSE RAWSPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONCALMBEAUFORT FORCELEAST WIND, MPH0CALM0NOW, 0 MPH1LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLESan Jose RAWS, the windSTATION REPORT · DCP RJSC1TYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 2 of 5DATE2026-09-27IDSR-RJSC1-2DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008

The column

At 863 ft above sea level, 3 per cent of the atmosphere's air lies below the station. The standard atmosphere puts the pressure there at 29.00 inHg and the temperature at 55.9 F; it reports 53.0 F, 2.9 F colder than standard.

Section from sea level of where San Jose RAWS stands in the atmosphere, height to scale: the station 863 feet above sea level with 3 per cent of the air below it; the standard atmosphere's pressure there, 29.00 inches of mercury, and temperature, 55.9 degrees Fahrenheit.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT RJSC1FIG. D WHERE SAN JOSE RAWS 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 ATMOSPHERESAN JOSE RAWS3 PER CENT OF THE AIR BELOW IT863 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 HERE29.00 inHgSTANDARD TEMPERATURE HERE55.9 FTEMPERATURE, REPORTED53.0 FTITLESan Jose RAWS, the columnSTATION REPORT · DCP RJSC1TYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 3 of 5DATE2026-09-27IDSR-RJSC1-3DRAWN AS linework on paperSOURCES FB-ENG-001, FB-ENG-003

The full report of San Jose RAWS, 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 Alum Rock

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