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Sac 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 SAC County


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Regional Hourly Observations For SAC County
Issued at 100 PM CDT SUN JUL 20 2025

   NORTHWEST IOWA
  
CITY           SKY/WX    TMP DP  RH WIND       PRES   REMARKS
CARROLL *      CLOUDY    81  73  78 SE6       29.93F HX  85  TC  27   
CHEROKEE *     PTSUNNY   81  72  74 E7        29.94F HX  84  TC  27   
DENISON *        N/A    N/A N/A N/A MISG        N/A                   
LE MARS *      PTSUNNY   81  70  69 E10       29.92S HX  84  TC  27   
MAURICE *      CLOUDY    77  70  78 E12       29.92S TC  25           
SIOUX CITY     CLOUDY    79  71  76 E10       29.92F HX  82  TC  26   
6HR MIN TEMP:  70; 6HR MAX TEMP:  80;                                

SPENCER        CLOUDY    76  70  82 E8        29.97S TC  24           
6HR MIN TEMP:  67; 6HR MAX TEMP:  76;                                

STORM LAKE *   PTSUNNY   79  70  73 VRB3      29.96S HX  81  TC  26

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

Current Agricultural Weather Conditions in Iowa
Based on observations at 100pm CDT, Sunday July 20, 2025

Across Iowa...temperatures are near 79 degrees west, near 82 degrees central, and near 79 degrees east. Current sky conditions are cloudy west, partly sunny central, and partly sunny east. In the west, relative humidity is near 76%, and the dew point is near 71 degrees. The heat index is near 82 degrees west. In the central part of the state, relative humidity is near 74%, and the dew point is near 73 degrees. The heat index is near 87 degrees central. In the east, relative humidity is near 82%, and the dew point is near 73 degrees. The heat index is near 82 degrees east. The livestock heat stress category is no stress west, no stress central, and no stress east. Winds are from the east at 10 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 from the east at 6 mph 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 SAC County,IA 

633 AM CDT Sun Jul 20 2025

 DAY ONE  Today and tonight

There is a Marginal Risk for severe weather for this afternoon
with damaging winds the primary threat.

 DAYS TWO THROUGH SEVEN  Monday through Saturday

Isolated non-severe thunderstorms may occur early Monday. 
Additional storms are possible mid to late next week.

 SPOTTER INFORMATION STATEMENT  

Spotter activation may be needed today.

NWS Severe Weather Map , Convective Outlook

7-Day Forecast For SAC County, IA
1220 PM CDT Sun Jul 20 2025

THIS AFTERNOON
Mostly cloudy. Highs in the lower 80s. East winds 5 to 10 mph.

TONIGHT
Mostly cloudy with a slight chance of showers and thunderstorms. Humid with lows in the upper 60s. East winds around 10 mph. Chance of rain 20 percent.

MONDAY
Mostly cloudy in the morning, then becoming partly sunny. Humid with highs in the mid 80s. Southeast winds around 10 mph.

MONDAY NIGHT
Partly cloudy in the evening, then mostly cloudy with 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. Humid with highs in the lower 90s. South winds 10 to 15 mph. Heat index values up to 106 in the afternoon.

TUESDAY NIGHT
Mostly clear in the evening, then partly cloudy with a slight chance of showers and thunderstorms after midnight. Lows in the lower 70s. Chance of rain 20 percent. Heat index values up to 105 early in the evening.

WEDNESDAY
Sunny. Highs in the lower 90s. Heat index values up to 105 in the afternoon.

WEDNESDAY NIGHT
Partly cloudy with a chance of showers and thunderstorms. Lows in the lower 70s. Chance of rain 40 percent. Heat index values up to 105 early in the evening.

THURSDAY
Partly sunny. A slight chance of showers and thunderstorms in the morning, then a chance of showers and thunderstorms in the afternoon. Highs in the upper 80s. Chance of rain 40 percent.

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

FRIDAY
Mostly sunny with a slight chance of showers and thunderstorms. Highs in the mid 80s. Chance of rain 20 percent.

FRIDAY NIGHT
Partly cloudy. A slight chance of showers and thunderstorms in the evening, then a chance of showers and thunderstorms after midnight. Lows in the upper 60s. Chance of rain 30 percent.

SATURDAY
Partly sunny in the morning, then clearing. Highs around 90. 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