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Sioux County, IA Weather and Climate Synopsis

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Weather Summary for Iowa
National Weather Service Des Moines IA
346 AM CST Tue Dec 31 2024

Today: 

Low pressure moving from Missouri into Central Illinois overnight
produced a broad area of light rain and snow across central and
southern Iowa early this morning. There were spotty areas of snow
accumulations with a few areas receiving around an inch or so.
Most primary roads and highways remained wet although less traveled
roads did become slushy in areas. Otherwise, northwest winds increased
and were common from 10 to 20 mph with gusts to almost 30 mph at 
times. 

The light precipitation is expected to come to an end this morning as
the system pulls away from the state. Some minor snow accumulations,
generally less than an inch remain possible in far south central to
southeast Iowa through mid morning, otherwise the north winds persist
for much of the day as cooler air arrives. Additional flurries are
expected late this afternoon into the evening as another weak system
passes through the state. 

Tonight and beyond: 

Any flurries are forecast to end tonight with clearing expected toward
daybreak on New Years Day. Mostly sunny skies will greet the New Year
with near normal temperatures in the mid 20s to lower 30s. However,
a clipper system approaches the state on Thursday with light snow
overspreading much of central into southern Iowa. Minor accumulations
are forecast by Thursday evening along with the arrival of cooler air.
Highs by Friday are forecast to remain in the teens to lower 20s over
much of the state as cold polar air overspread the Midwest.
National Ag. Weather Outlook, International Ag. Weather Summary
Current Surface Map, [2nd Source TWC]

Precision Agriculture Weather Forecast For SIOUX County


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Regional Hourly Observations For SIOUX County
Issued at 200 PM CDT SUN JUL 20 2025

NORTHWEST IOWA
  
CITY           SKY/WX    TMP DP  RH WIND       PRES   REMARKS
CHEROKEE       PTSUNNY   82  72  69 E8        29.93F TC  28           
DENISON          N/A    N/A N/A N/A MISG        N/A                   
ESTHERVILLE    MOSUNNY   80  71  74 E7        29.96F TC  27           
LE MARS        PTSUNNY   81  72  74 SE7       29.91S TC  27           
MAURICE        MOSUNNY   79  70  73 E12G17    29.91F TC  26           
SIOUX CITY     CLOUDY    80  73  79 SE6       29.90F TC  27           
SPENCER        MOSUNNY   81  71  71 E10       29.95F TC  27           
STORM LAKE     PTSUNNY   81  72  74 E9        29.94F TC  27

Current Temperatures, Dewpoint, RH, Wind, Regional Obs, Surface 4-Panel

Current Agricultural Weather Conditions in Iowa
Based on observations at 200pm CDT, Sunday July 20, 2025

Across Iowa...temperatures are near 80 degrees west, near 84 degrees central, and near 80 degrees east. Current sky conditions are cloudy west, partly sunny central, and partly sunny east. In the west, relative humidity is near 79%, and the dew point is near 73 degrees. The heat index is near 84 degrees west. In the central part of the state, relative humidity is near 69%, and the dew point is near 73 degrees. The heat index is near 90 degrees central. In the east, relative humidity is near 79%, and the dew point is near 73 degrees. The heat index is near 84 degrees east. The livestock heat stress category is no stress west, danger central, and no stress east. Winds are from the southeast at 6 mph west, where conditions are favorable for spraying. Winds are from the southeast at 7 mph central, where conditions are favorable for spraying. Winds are calm east, where conditions are favorable for spraying. Based on current available observations, the highest temperature is 86 degrees at Clarinda. The lowest temperature is 71 degrees at Dubuque.

Current NOWCAST not available:
Nowcasts are not issued routinely during fair weather. Only when
precipitation or other significant weather is occuring in this county will these
forecasts be issued. Currently, there is no short term forecast in effect.

US Radar, All NWS Radars (In near-real time), Current Livestock Heat Stress Index (LSI), Current Wind Chill Map
Hazardous Weather Outlook For SIOUX County,IA 

355 AM CDT Sun Jul 20 2025

 DAY ONE  Today and tonight.

Thunderstorms are possible this evening and night along and north of
I-90. Storms look to be in the form of a line and be capable of
damaging winds, large hail, and potentially a tornado. 

 DAYS TWO THROUGH SEVEN  Monday through Saturday.

Thunderstorm chances continue through the week, some of which may be
strong to severe at times. Be sure to check the latest forecast for 
the most up to date information.

Hot and humid conditions are expected throughout the week. Heat
indices may reach into the 100s on Monday and Tuesday. 

 SPOTTER INFORMATION STATEMENT  

Spotter activation is not expected at this time.

NWS Severe Weather Map , Convective Outlook

7-Day Forecast For SIOUX County, IA
227 PM CDT Sun Jul 20 2025

TONIGHT
Mostly cloudy. A slight chance of showers and thunderstorms after midnight. Lows in the upper 60s. East winds around 10 mph. Chance of rain 20 percent.

MONDAY
Cloudy in the morning, then becoming partly sunny. Humid with highs in the mid 80s. Southeast winds 10 to 15 mph.

MONDAY NIGHT
Partly cloudy. A slight chance of showers and thunderstorms after midnight. Humid with lows in the lower 70s. Southeast winds around 10 mph. Chance of rain 20 percent.

TUESDAY
Mostly sunny. A slight chance of showers and thunderstorms in the morning. Humid with highs in the lower 90s. South winds 10 to 15 mph with gusts up to 25 mph. Chance of rain 20 percent. Heat index values up to 107 in the afternoon.

TUESDAY NIGHT
Mostly clear. A slight chance of showers and thunderstorms after midnight. Humid with lows in the lower 70s. South winds 10 to 15 mph. Chance of rain 20 percent. Heat index values up to 106 early in the evening.

WEDNESDAY
Sunny. A slight chance of showers and thunderstorms in the afternoon. Highs in the lower 90s. Chance of rain 20 percent. Heat index values up to 105 in the afternoon.

WEDNESDAY NIGHT
Partly cloudy in the evening, then becoming mostly cloudy. A chance of showers and thunderstorms. Lows in the upper 60s. Chance of rain 50 percent. Heat index values up to 100 early in the evening.

THURSDAY
Partly sunny. A chance of showers and thunderstorms in the afternoon. Highs in the mid 80s. Chance of rain 50 percent.

THURSDAY NIGHT
Partly cloudy in the evening, then becoming mostly cloudy. A chance of showers and thunderstorms. Lows in the upper 60s. Chance of rain 30 percent.

FRIDAY
Mostly sunny. Highs in the mid 80s.

FRIDAY NIGHT
Partly cloudy. Lows in the upper 60s.

SATURDAY
Mostly sunny. Highs in the upper 80s.

SATURDAY NIGHT
Mostly clear in the evening, then becoming partly cloudy. Lows in the upper 60s.

SUNDAY
Sunny. Highs in the upper 80s. Heat index values up to 100 in the afternoon.

12-48 Hr Surface Forecast Maps, TWC 4-Panel Surface Forecast, Fire Danger, Day 1 Precip, Day 2 Precip, Days 1-5 Precip, Severe Weather Pot.-Day 1, Day 2

Medium & Long Range Outlook For Iowa 
                                 IOWA                                                                     
                 ---------------------------------------------
                 6 TO 10 DAY  8 TO 14 DAY   30 DAY    90 DAY 
                   JUL 25-29 JUL 27-AUG 2    JUN       JUN-AUG                      
                 -----------  -----------  --------  ---------
   Temperature:      Above        Above                                            
 Precipitation:     Normal       Normal                                            

....  Medium and long range outlooks provided by NCEP/K. Thomas Priddy
5 Day Rainfall Forecast, 6 to 10 Day , 8 to 14 Day , Text, 30-Day Outook, 90-Day Outook, 120-Day Outlook
Almanac Information
Historical Weather And Climate Facts For Today

////////////////////////
JULY 20TH...HISTORIC WEATHER EVENTS
...1930...
The temperature at Washington D.C. soared to an all-time record of 106
degrees. The next day Millsboro reached 110 degrees to set a record for the
state of Delaware. July 1930 was one of the hottest and driest summers in
the U.S., particularly in the Missouri Valley where severe drought
conditions developed. Toward the end of the month state records were set
for Kentucky with 114 degrees, and Mississippi with 115 degrees. (David
Ludlum)
...1934...
The temperature at Keokuk IA soared to 118 degrees to establish a state
record. (The Weather Channel)
...1953...
Twenty-two inches of hail reportedly fell northeast of Dickinson ND. (The
Weather Channel)
...1986...
The temperature at Charleston SC hit 104 degrees for the second day in a
row to tie their all-time record high. (The Weather Channel)
...1987...
Thunderstorms produced severe weather across Minnesota, Wisconsin and
Michigan. Thunderstorms produced wind gusts to 87 mph at Mosinee WI, and
strong thunderstorm winds capsized twenty-six boats on Grand Traverse Bay
drowning two women. Thunderstorms produced nine inches of rain at Shakopee
MN, with 7.83 inches reported in six hours at Chaska MN. Thunderstorms in
north central Nebraska produced hail as large as golf balls in southwestern
Cherry County, which accumulated to a depth of 12 inches. (The National
Weather Summary) (Storm Data)
...1988...
The temperature at Redding CA soared to an all-time record high of 118
degrees. Showers and thunderstorms produced much needed rains from New
England to southern Texas. Salem IN was deluged with 7.2 inches of rain
resulting in flash flooding. (The National Weather Summary)
...1989...
Showers and thunderstorms in the Middle Atlantic Coast Region soaked
Wilmington DE with 2.28 inches of rain, pushing their total for the period
May through July past the previous record of 22.43 inches. Heavy rain over
that three month period virtually wiped out a 16.82 inch deficit which had
been building since drought conditions began in 1985. Thunderstorms in
central Indiana deluged Lebanon with 6.50 inches of rain in twelve hours,
and thunderstorms over Florida produced wind gusts to 84 mph at Flagler
Beach. (The National Weather Summary) (Storm Data)

Ag Weather Center, Department of Biosystems & Agricultural Engineering, University of Kentucky