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California Polytechnic State University, California

Community in San Luis Obispo County, California

Air quality

The air at California Polytechnic State University

Index 42, good, led by ozone. Read at 11 PM from its reporting area, Morro Bay (CA), 10 miles off.

42Good
  • Fine particles (PM2.5)-13.5 mi
  • Ozone42Good26 ppb13.5 mi
  • Coarse particles (PM10)-13.5 mi
  • Nitrogen dioxide8Good8.8 ppb13.5 mi

The days ahead

Good each day through Tue Oct 20, led by ozone. Yesterday measured 41, good.

Smoke, the next 43 hours

Little smoke near the ground through Sat 5 PM: the index from smoke stays at 11 or under.

FriSat

Precipitation

What has fallen at California Polytechnic State University

None in the last 3 days, to Thu 10 PM. 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 California Polytechnic State University, the next 43 hours

Visibility stays 10 miles or more through Sat 5 PM.

FriSat

On the radar over California Polytechnic State University, CaliforniaReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

What is measuring near here

The 5 instruments nearest California Polytechnic State University, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.5 miles away.

measured now3 instruments

measured daily2 instruments

San Luis Obispo PolySBPC1

At a cooperative observer's station/0.5 mi away/361 ft/42 ft below here

snowfall, snow depth, precip, high, low

Rank-

San Luis Obispo 2.2 NNWCA-SL-18

In a volunteer observer's own ground/1.4 mi away/324 ft/79 ft below here

precip, snowfall, snow depth

Rank-

Station report

The weather at San Luis Obispo, drawn

The nearest airport reporting now, 4.4 mi from California Polytechnic State University, California. From its report of Oct 15, 2026, 10:56 PM local time: 3 of its 6 sheets.

The sky

No cloud below 12,000 ft; visibility 10 mi or more.

Section of the sky over San Luis Obispo, height above the station to scale: no cloud detected below 12,000 feet, the reach of its ceilometer, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT SBPFIG. A THE SKY OVER SAN LUIS OBISPOSECTION, 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 SHEETNO CLOUD DETECTED BELOW 12,000 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLESan Luis Obispo, the skySTATION REPORT · ASOS SBPTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-SBP-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

62.0 F with a dew point of 43.0 F, 50 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 4,300 ft up.

Chart of the air at San Luis Obispo: temperature 62.0 degrees Fahrenheit and dew point 43.0, 50 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 4,300 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT SBPFIG. B THE AIR AT SAN LUIS OBISPOTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,0004,0005,0006,00030 F40 F50 F60 F70 FSATURATES 4,300 FT ABOVE THE STATION, AT 38.8 FTEMPERATURE 62.0 FDEW POINT 43.0 FSPREAD 19.0 FRELATIVE HUMIDITY 50 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 Luis Obispo, the airSTATION REPORT · ASOS SBPTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-SBP-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the east southeast (120 degrees) at 3 mph: force 1, a light air on the Beaufort scale. The strongest gust today was 28 mph.

Plan of the wind at San Luis Obispo, north up: blowing from 120 degrees, the east southeast, at 3 miles an hour; beside it the Beaufort scale from calm to hurricane force, force 1, light air, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT SBPFIG. C THE WIND AT SAN LUIS OBISPOPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 120°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR1NOW, 3 MPH2LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLESan Luis Obispo, the windSTATION REPORT · ASOS SBPTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-SBP-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of San Luis Obispo, in 6 sheets, each beside the Field Book plates that explain it

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Snow on the ground

Elsewhere in California

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

Near California Polytechnic State University

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

Near California Polytechnic State University

River and lake gauges