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La Mesa, California

City in San Diego County, California

Air quality

The air at La Mesa

Index 30, good, led by ozone. Read at 8 PM from its reporting area, San Diego Mesa and Inland Valley (CA), 6 miles off.

30Good
  • Fine particles (PM2.5)17Good5.2 mi
  • Ozone30Good18 ppb5.2 mi
  • Coarse particles (PM10)19Good5.2 mi

The days ahead

Good each day through Fri Oct 16, led by ozone. Yesterday measured 48, good.

Smoke, the next 45 hours

Little smoke near the ground through Sat 5 PM: the index from smoke stays at 28 or under.

FriSat

Precipitation

What has fallen at La Mesa

None in the last 3 days, to Thu 8 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 La Mesa, the next 45 hours

Visibility stays 10 miles or more through Sat 5 PM.

FriSat

On the radar over La Mesa, CaliforniaReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

What is measuring near here

The 5 instruments nearest La Mesa, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 1.7 miles away.

measured now3 instruments

measured daily2 instruments

Lemon Grove Fire DeptLMGC1

At a cooperative observer's station/2.1 mi away/443 ft/103 ft below here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at San Diego/Gillespie, drawn

The nearest airport reporting now, 5.0 mi from La Mesa, California. From its report of Oct 15, 2026, 9:15 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 Diego/Gillespie, 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 SEEFIG. A THE SKY OVER SAN DIEGO/GILLESPIESECTION, 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 Diego/Gillespie, the skySTATION REPORT · ASOS SEETYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-SEE-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

71.6 F with a dew point of 41.0 F, 33 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 6,900 ft up.

Chart of the air at San Diego/Gillespie: temperature 71.6 degrees Fahrenheit and dew point 41.0, 33 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 6,900 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT SEEFIG. B THE AIR AT SAN DIEGO/GILLESPIETHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION02,0004,0006,0008,00020 F30 F40 F50 F60 F70 F80 FSATURATES 6,900 FT ABOVE THE STATION, AT 34.5 FTEMPERATURE 71.6 FDEW POINT 41.0 FSPREAD 30.6 FRELATIVE HUMIDITY 33 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 Diego/Gillespie, the airSTATION REPORT · ASOS SEETYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-SEE-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

Calm.

Plan of the wind at San Diego/Gillespie, 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 SEEFIG. C THE WIND AT SAN DIEGO/GILLESPIEPLAN, 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 Diego/Gillespie, the windSTATION REPORT · ASOS SEETYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-SEE-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of San Diego/Gillespie, 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 La Mesa

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

Near La Mesa

River and lake gauges