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San Juan, Texas

City in Hidalgo County, Texas

Air quality

The air at San Juan

Index 25, good, led by ozone. Read at 11 AM from its reporting area, Brownsville-McAllen (TX), 29 miles off.

25Good
  • Fine particles (PM2.5)24Good8.9 mi
  • Ozone25Good32 ppb8.9 mi
  • Coarse particles (PM10)12Good8.9 mi

The days ahead

Highest moderate, today, led by fine particles. Yesterday measured 39, good.

Smoke, the next 45 hours

Little smoke near the ground through Sun 7 AM: the index from smoke stays at 6 or under.

FriSatSun

Precipitation

What has fallen at San Juan

None in the last 24 hours; 0.02 in over the last 3 days, to Fri 10 AM. Measured by radar and rain gauges, as water.

Last 24 hours
0.00in
Last 3 days
0.02in

Visibility

How far you can see at San Juan, the next 45 hours

Visibility stays 10 miles or more through Sun 7 AM.

FriSatSun

On the radar over San Juan, TexasReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

What is measuring near here

The 7 instruments nearest San Juan, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.4 miles away.

measured now5 instruments

WeslacoS2205

At a soil climate station/12.3 mi away/57 ft/46 ft below here

temp, humidity, soil temp, soil moisture

Rank2,860of 4,689

measured daily2 instruments

San Juan 0.7 NTX-HDL-68

In a volunteer observer's own ground/0.4 mi away/111 ft/8 ft above here

precip, snowfall, snow depth

Rank-

McallenMCAT2

At a cooperative observer's station/4.1 mi away/128 ft/25 ft above here

snowfall, snow depth, precip, high, low

Rank3,030of 4,689

Station report

The weather at Mcallen/Miller INTL, drawn

The nearest airport reporting now, 5.8 mi from San Juan, Texas. From its report of Oct 16, 2026, 10:53 AM 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 Mcallen/Miller INTL, 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 MFEFIG. A THE SKY OVER MCALLEN/MILLER INTLSECTION, 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 MORE0510TITLEMcallen/Miller INTL, the skySTATION REPORT · ASOS MFETYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-MFE-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

85.0 F with a dew point of 69.0 F, 59 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 3,700 ft up.

Chart of the air at Mcallen/Miller INTL: temperature 85.0 degrees Fahrenheit and dew point 69.0, 59 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 3,700 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT MFEFIG. B THE AIR AT MCALLEN/MILLER INTLTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,0004,0005,00050 F60 F70 F80 F90 F100 FSATURATES 3,700 FT ABOVE THE STATION, AT 65.2 FTEMPERATURE 85.0 FDEW POINT 69.0 FSPREAD 16.0 FRELATIVE HUMIDITY 59 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 POINTTITLEMcallen/Miller INTL, the airSTATION REPORT · ASOS MFETYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-MFE-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the north northwest (340 degrees) at 16 mph, gusting 29 mph: force 4, a moderate breeze on the Beaufort scale. The strongest gust today was 30 mph.

Plan of the wind at Mcallen/Miller INTL, north up: blowing from 340 degrees, the north northwest, at 16 miles an hour, gusting 29; beside it the Beaufort scale from calm to hurricane force, force 4, moderate breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT MFEFIG. C THE WIND AT MCALLEN/MILLER INTLPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 340°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE13NOW, 16 MPH5FRESH BREEZE196STRONG BREEZE25GUST, 29 MPH7NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEMcallen/Miller INTL, the windSTATION REPORT · ASOS MFETYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-MFE-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Mcallen/Miller INTL, in 6 sheets, each beside the Field Book plates that explain it

0in

Snow on the ground

Measured at Mcallen (MCAT2), 4.1 miles from here, read 16 Oct, 06:00. measured daily

Elsewhere in Texas

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

Near San Juan

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

Near San Juan

River and lake gauges