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Grimes, Iowa

City in Polk County, Iowa

Air quality

The air at Grimes

Index 14, good, led by ozone. Read at 10 PM from its reporting area, Des Moines (IA), 13 miles off.

14Good
  • Fine particles (PM2.5)11Good-
  • Ozone14Good16 ppb9.7 mi

The days ahead

Highest moderate, today, led by fine particles. Yesterday measured 20, good.

Smoke, the next 46 hours

No smoke near the ground through Sat 7 PM.

FriSat

Precipitation

What has fallen at Grimes

0.43 in in the last 24 hours, and none in the 2 days before, to Thu 9 PM. Measured by radar and rain gauges, as water.

Last 24 hours
0.43in
Last 3 days
0.43in

Visibility

How far you can see at Grimes, the next 46 hours

Visibility stays 7 miles or more through Sat 7 PM, lowest 8 miles Sat 6 AM.

FriSat

On the radar over Grimes, IowaReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

What is measuring near here

The 8 instruments nearest Grimes, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.9 miles away.

measured now6 instruments

GrangerRGAI4

Beside a road/3.6 mi away/863 ft/92 ft below here

temp, pavement temp, wind, visibility, precip

Rank893of 1,060

AnkenyIKV

At an airfield/11.4 mi away/888 ft/67 ft below here

temp, wind, gust, visibility, precip, pressure

Rank152of 1,060

AmesS2031

At a soil climate station/21.8 mi away/1,073 ft/118 ft above here

temp, humidity, soil temp, soil moisture

Rank748of 1,060

measured daily2 instruments

Grimes 1.0 NIA-PK-112

In a volunteer observer's own ground/0.9 mi away/974 ft/19 ft above here

precip, snowfall, snow depth

Rank-

JohnstonUBSI4

At a cooperative observer's station/2.0 mi away/942 ft/13 ft below here

snowfall, snow depth, precip, high, low

Rank795of 1,060

Station report

The weather at Ankeny, drawn

The nearest airport reporting now, 11.4 mi from Grimes, Iowa. From its report of Oct 15, 2026, 10:15 PM local time: 3 of its 6 sheets.

The sky

Broken at 3,900 ft, overcast at 4,400 ft; the ceiling is 3,900 ft; visibility 10 mi or more.

Section of the sky over Ankeny, height above the station to scale: broken cloud with its base at 3,900 feet, overcast cloud with its base at 4,400 feet, the ceiling at 3,900 feet, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT IKVFIG. A THE SKY OVER ANKENYSECTION, 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 STATION01,0002,0003,0004,0005,0006,0007,000ETAGESLOWMIDDLETHE STATIONTHE CEILOMETER READS TO 12,000 FT, ABOVE THIS SHEETOVC 4,400 FTOVERCAST, 8 EIGHTHS OF THE SKYBKN 3,900 FTBROKEN, 5 TO 7 EIGHTHS OF THE SKYCEILING 3,900 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLEAnkeny, the skySTATION REPORT · ASOS IKVTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-IKV-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-017, FB-SKY-016, FB-SKY-018

The air

51.8 F with a dew point of 44.6 F, 76 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 3,900 ft.

Chart of the air at Ankeny: temperature 51.8 degrees Fahrenheit and dew point 44.6, 76 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 3,900 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT IKVFIG. B THE AIR AT ANKENYTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,0004,0005,00030 F40 F50 F60 FSATURATES 1,700 FT ABOVE THE STATION, AT 43.0 FLOWEST CLOUD REPORTED, BKN 3,900 FTTEMPERATURE 51.8 FDEW POINT 44.6 FSPREAD 7.2 FRELATIVE HUMIDITY 76 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 POINTTITLEAnkeny, the airSTATION REPORT · ASOS IKVTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-IKV-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the northwest (310 degrees) at 21 mph, gusting 33 mph: force 5, a fresh breeze on the Beaufort scale. The strongest gust today was 33 mph.

Plan of the wind at Ankeny, north up: blowing from 310 degrees, the northwest, at 21 miles an hour, gusting 33; beside it the Beaufort scale from calm to hurricane force, force 5, fresh breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT IKVFIG. C THE WIND AT ANKENYPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 310°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE19NOW, 21 MPH6STRONG BREEZE257NEAR GALE32GUST, 33 MPH8GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEAnkeny, the windSTATION REPORT · ASOS IKVTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-IKV-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

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

0in

Snow on the ground

Measured at Johnston (UBSI4), 2.0 miles from here, read 15 Oct, 15:00. measured daily

Elsewhere in Iowa

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

Near Grimes

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

Near Grimes

River and lake gauges