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Arroyo, Puerto Rico

Town in Arroyo Municipio, Puerto Rico

Air quality

The air at Arroyo

Index 27, good, led by fine particles. Read at 11 PM from its reporting area, Catano (PR), 32 miles off.

27Good
  • Fine particles (PM2.5)27Good-

The days ahead

Yesterday measured 46, good.

On the radar over Arroyo, Puerto RicoReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

What is measuring near here

The 5 instruments nearest Arroyo, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 1.8 miles away.

measured now3 instruments

FortunaS2122

At a soil climate station/30.9 mi away/93 ft/53 ft above here

temp, humidity, soil temp, soil moisture

Rank-

San JuanTJSJ

At an airfield/32.1 mi away/9 ft/31 ft below here

temp, wind, gust, visibility, precip, pressure

Rank34of 243

measured daily2 instruments

GuayamaGUYP4

At a cooperative observer's station/1.8 mi away/75 ft/35 ft above here

snowfall, snow depth, precip, high, low

Rank-

Guayama 1.1 WPR-GM-2

In a volunteer observer's own ground/4.4 mi away/155 ft/115 ft above here

precip, snowfall, snow depth

Rank-

Station report

The weather at San Juan, drawn

The nearest airport reporting now, 32.1 mi from Arroyo, Puerto Rico. From its report of Oct 16, 2026, 12:56 AM local time: 3 of its 6 sheets.

The sky

Scattered at 7,000 ft; visibility 10 mi or more.

Section of the sky over San Juan, height above the station to scale: scattered cloud with its base at 7,000 feet, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT TJSJFIG. A THE SKY OVER SAN JUANSECTION, 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 STATION02,5005,0007,50010,00012,500ETAGESLOWMIDDLETHE STATIONTHE CEILOMETER READS TO 12,000 FTSCT 7,000 FTSCATTERED, 3 TO 4 EIGHTHS OF THE SKYVISIBILITY, MILES: 10 MI OR MORE0510TITLESan Juan, the skySTATION REPORT · ASOS TJSJTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-TJSJ-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-013, FB-SKY-014

The air

83.0 F with a dew point of 76.0 F, 79 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 1,700 ft up; the lowest cloud reported is at 7,000 ft.

Chart of the air at San Juan: temperature 83.0 degrees Fahrenheit and dew point 76.0, 79 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 1,700 feet above the station, against the lowest cloud reported at 7,000 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT TJSJFIG. B THE AIR AT SAN JUANTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,0004,0005,0006,0007,00060 F70 F80 F90 FSATURATES 1,700 FT ABOVE THE STATION, AT 74.3 FLOWEST CLOUD REPORTED, SCT 7,000 FTTEMPERATURE 83.0 FDEW POINT 76.0 FSPREAD 7.0 FRELATIVE HUMIDITY 79 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 Juan, the airSTATION REPORT · ASOS TJSJTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-TJSJ-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.

Plan of the wind at San Juan, 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 TJSJFIG. C THE WIND AT SAN JUANPLAN, 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 Juan, the windSTATION REPORT · ASOS TJSJTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-TJSJ-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

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

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Snow on the ground

Near Arroyo

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

Near Arroyo

River and lake gauges