Alton, Iowa Weather
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Weather Forecast for Alton, Iowa : Sioux County
Issued: 5:00 pm CDT Aug 2, 2025 Latitude: 42.9874869 Longitude: -96.0105735 View on Google Maps

MouseOver for Detail Forecast
Tonight Sunday Monday Tuesday Wednesday Thursday Friday Saturday
Thunderstorms on Tonight Thunderstorms on Sunday 30% chance of thunderstorms on Monday Mostly Sunny on Tuesday Mostly Sunny on Wednesday Mostly Sunny on Thursday Mostly Sunny on Friday Mostly Sunny on Saturday
Low: 59°F High: 75°F High: 77°F High: 79°F High: 85°F High: 88°F High: 89°F High: 86°F
Low: 59°F Low: 60°F Low: 65°F Low: 68°F Low: 71°F Low: 69°F  
Thunderstorms Thunderstorms Thunderstorms Mostly Sunny Mostly Sunny Mostly Sunny Mostly Sunny Mostly Sunny
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Current Conditions at
LE MARS - (KLRJ)
Clear
as of 4:55 PM CDST
Visibility: 9 Miles
Pressure: 30.21 in.
Flight Rule: VFR
Wind Data
13 MPH
160° South
Cloud Level(s): Clear
Current Conditions at
SHELDON - (KSHL)
Clear
as of 4:55 PM CDST
Visibility: 7 Miles
Pressure: 30.22 in.
Flight Rule: VFR
Wind Data
5 MPH
160° South
Cloud Level(s): Clear
Current Conditions at
SPENCER - (KSPW)
72°
Cloudy
as of 4:53 PM CDST
Rel. Humidity: 73%
Dew Point: 63°F
Visibility: 10 Miles
Pressure: 30.25 in.
Flight Rule: VFR
Wind Data
5 MPH
190° South
Cloud Level(s): Few at 3800ft, Solid Overcast at 6000ft
Thunderstorms on Tonight Tonight... A 20 percent chance of showers and thunderstorms after 4am. Areas of smoke before midnight, then areas of smoke after 3am. Mostly cloudy, with a low around 59. South southeast wind around 10 mph.
Thunderstorms on Sunday Sunday... A 30 percent chance of showers and thunderstorms, mainly before 11am. Areas of smoke before 11am. Mostly cloudy, with a high near 75. South wind 10 to 15 mph, with gusts as high as 20 mph.
40% chance of thunderstorms Sunday Night Sunday Night... A slight chance of showers and thunderstorms before 7pm, then a slight chance of showers between 7pm and 1am, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 59. South southeast wind 5 to 10 mph. Chance of precipitation is 40%.
30% chance of thunderstorms Monday Monday... A 30 percent chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 77. South wind 5 to 10 mph.
20% chance of thunderstorms Monday Night Monday Night... A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 60. South southeast wind 5 to 10 mph.
Mostly Sunny on Tuesday Tuesday... Mostly sunny, with a high near 79. South wind 5 to 15 mph, with gusts as high as 20 mph.
30% chance of thunderstorms Tuesday Night Tuesday Night... A 30 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 65.
Mostly Sunny on Wednesday Wednesday... Mostly sunny, with a high near 85.
30% chance of rain Wednesday Night Wednesday Night... A 30 percent chance of showers after 1am. Mostly clear, with a low around 68.
Mostly Sunny on Thursday Thursday... Mostly sunny, with a high near 88.
Cloudy on Thursday Night Thursday Night... Partly cloudy, with a low around 71.
Mostly Sunny on Friday Friday... Mostly sunny, with a high near 89.
30% chance of thunderstorms Friday Night Friday Night... A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 69.
Mostly Sunny on Saturday Saturday... Mostly sunny, with a high near 86.
Current Radar Image


Sun Almanac for Alton, Iowa
Sunrise: 06:17 AM
Sunset: 8:44 PM
Civil Sunrise:05:45 AM
Civil Sunset: 9:16 PM
Nautical Sunrise: 05:05 AM
Nautical Sunset: 9:56 PM
Astro Sunrise: 04:20 AM
Astro Sunset: 10:40 PM
Any use of the information on this page is at your own risk. This information should not be relied upon in life-threatening situations, potential financial loss situations or in lieu of any officially disseminated information. Visit the National Weather Service for official information.