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San Leandro, California

City in Alameda County, California

Air quality

The air at San Leandro

Index 69, moderate, led by fine particles. Read at 8 PM from its reporting area, Oakland (CA), 9 miles off.

69Moderate
  • Fine particles (PM2.5)69Moderate-
  • Ozone40Good-

The days ahead

Highest moderate, Sat Oct 17, led by fine particles. Yesterday measured 37, good.

Smoke, the next 46 hours

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

ThuFriSat

Precipitation

What has fallen at San Leandro

None in the last 3 days, to Thu 7 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 San Leandro, the next 46 hours

Visibility stays 10 miles or more through Sat 5 PM.

ThuFriSat

On the radar over San Leandro, CaliforniaReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

What is measuring near here

The 6 instruments nearest San Leandro, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 3.3 miles away.

measured now4 instruments

HaywardHWD

At an airfield/4.2 mi away/29 ft/24 ft below here

temp, wind, gust, visibility, precip, pressure

Rank7of 4,465

measured daily2 instruments

Oakland - Upper San LeanfroUSLC1

At a cooperative observer's station/4.0 mi away/316 ft/263 ft above here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at Hayward, drawn

The nearest airport reporting now, 4.2 mi from San Leandro, California. From its report of Oct 15, 2026, 7:54 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 Hayward, 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 HWDFIG. A THE SKY OVER HAYWARDSECTION, 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 MORE0510TITLEHayward, the skySTATION REPORT · ASOS HWDTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-HWD-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

69.0 F with a dew point of 57.0 F, 66 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 2,800 ft up.

Chart of the air at Hayward: temperature 69.0 degrees Fahrenheit and dew point 57.0, 66 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 2,800 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT HWDFIG. B THE AIR AT HAYWARDTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,0004,00040 F50 F60 F70 F80 FSATURATES 2,800 FT ABOVE THE STATION, AT 54.2 FTEMPERATURE 69.0 FDEW POINT 57.0 FSPREAD 12.0 FRELATIVE HUMIDITY 66 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 POINTTITLEHayward, the airSTATION REPORT · ASOS HWDTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-HWD-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

Calm.

Plan of the wind at Hayward, 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 HWDFIG. C THE WIND AT HAYWARDPLAN, 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 FORCE73TITLEHayward, the windSTATION REPORT · ASOS HWDTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-HWD-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Hayward, 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 San Leandro

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

Near San Leandro

River and lake gauges