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Nelson, Arizona

Community in Pima County, Arizona

Air quality

The air at Nelson

Index 43, good, led by coarse particles. Read at 10 PM from its reporting area, Rillito (AZ), 6 miles off.

43Good
  • Fine particles (PM2.5)-9 mi
  • Ozone-23 ppb5.8 mi
  • Coarse particles (PM10)43Good5.8 mi
  • Nitrogen dioxide3Good3 ppb19.2 mi
  • Sulfur dioxide0Good0 ppb19.2 mi
  • Carbon monoxide-0.1 ppm19.2 mi

The days ahead

Highest 96, moderate, Fri Oct 16, led by coarse particles. Yesterday measured 16, good.

Smoke, the next 43 hours

No smoke near the ground through Sat 5 PM.

FriSat

Precipitation

What has fallen at Nelson

None in the last 24 hours; 0.05 in over the last 3 days, to Thu 10 PM. Measured by radar and rain gauges, as water.

Last 24 hours
0.00in
Last 3 days
0.05in

Visibility

How far you can see at Nelson, the next 43 hours

Visibility stays 10 miles or more through Sat 5 PM.

FriSat

On the radar over Nelson, ArizonaReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

What is measuring near here

The 6 instruments nearest Nelson, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 3.2 miles away.

measured now4 instruments

measured daily2 instruments

Marana 9.0 WAZ-PM-58

In a volunteer observer's own ground/4.1 mi away/1,977 ft/3 ft above here

precip, snowfall, snow depth

Rank-

Tucson 17 NWSNMA3

At a cooperative observer's station/12.9 mi away/2,561 ft/587 ft above here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at Tucson - Marana, drawn

The nearest airport reporting now, 3.2 mi from Nelson, Arizona. From its report of Oct 15, 2026, 10:35 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 Tucson - Marana, 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 AVQFIG. A THE SKY OVER TUCSON - MARANASECTION, 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 MORE0510TITLETucson - Marana, the skySTATION REPORT · ASOS AVQTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-AVQ-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

66.2 F with a dew point of 50.0 F, 56 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 Tucson - Marana: temperature 66.2 degrees Fahrenheit and dew point 50.0, 56 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 AVQFIG. B THE AIR AT TUCSON - MARANATHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,0004,0005,00040 F50 F60 F70 F80 FSATURATES 3,700 FT ABOVE THE STATION, AT 46.4 FTEMPERATURE 66.2 FDEW POINT 50.0 FSPREAD 16.2 FRELATIVE HUMIDITY 56 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 POINTTITLETucson - Marana, the airSTATION REPORT · ASOS AVQTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-AVQ-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

At 5 mph: force 2, a light breeze on the Beaufort scale. The strongest gust today was 12 mph.

Plan of the wind at Tucson - Marana, north up: at 5 miles an hour; beside it the Beaufort scale from calm to hurricane force, force 2, light breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT AVQFIG. C THE WIND AT TUCSON - MARANAPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONDIRECTION NOT REPORTEDBEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE4NOW, 5 MPH3GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLETucson - Marana, the windSTATION REPORT · ASOS AVQTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-AVQ-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Tucson - Marana, in 6 sheets, each beside the Field Book plates that explain it

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Snow on the ground

Elsewhere in Arizona

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

Near Nelson

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

Near Nelson

River and lake gauges