National Weather Service Forecast for: Storm Lake IA
Issued by: National Weather Service Sioux Falls, SD
Updated: 7:28 pm CDT Jun 18, 2026
 
Tonight

Tonight: Mostly clear, with a low around 52. North northwest wind around 5 mph becoming calm in the evening.
Mostly Clear

 Juneteenth

Juneteenth: A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Increasing clouds, with a high near 79. Light south southwest wind becoming west 5 to 10 mph in the morning. Winds could gust as high as 20 mph. Chance of precipitation is 30%.
Mostly Sunny
then Chance
Showers
 Friday
Night
Friday Night: A 20 percent chance of showers before 8pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 55. West southwest wind 5 to 10 mph becoming north after midnight.
Slight Chance
Showers then
Mostly Clear
 Saturday

Saturday: Mostly sunny, with a high near 80. Northeast wind around 5 mph.
Mostly Sunny

 Saturday
Night
Saturday Night: Showers likely, mainly after 1am. Cloudy, with a low around 58. East wind 5 to 10 mph. Chance of precipitation is 70%.
Chance
Showers then
Showers
Likely
 Sunday

Sunday: Showers likely, mainly before 1pm. Mostly cloudy, with a high near 70. Breezy, with an east wind 15 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 70%.
Showers
Likely and
Breezy
 Sunday
Night
Sunday Night: Mostly cloudy, with a low around 54.
Mostly Cloudy

 Monday

Monday: Partly sunny, with a high near 74.
Partly Sunny

 Monday
Night
Monday Night: Partly cloudy, with a low around 54.
Partly Cloudy
Lo 52 °F Hi 79 °F Lo 55 °F Hi 80 °F Lo 58 °F Hi 70 °F Lo 54 °F Hi 74 °F Lo 54 °F

 

Tonight
 
 Mostly clear, with a low around 52. North northwest wind around 5 mph becoming calm in the evening.
Juneteenth
 
 A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Increasing clouds, with a high near 79. Light south southwest wind becoming west 5 to 10 mph in the morning. Winds could gust as high as 20 mph. Chance of precipitation is 30%.
Friday Night
 
 A 20 percent chance of showers before 8pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 55. West southwest wind 5 to 10 mph becoming north after midnight.
Saturday
 
 Mostly sunny, with a high near 80. Northeast wind around 5 mph.
Saturday Night
 
 Showers likely, mainly after 1am. Cloudy, with a low around 58. East wind 5 to 10 mph. Chance of precipitation is 70%.
Sunday
 
 Showers likely, mainly before 1pm. Mostly cloudy, with a high near 70. Breezy, with an east wind 15 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 70%.
Sunday Night
 
 Mostly cloudy, with a low around 54.
Monday
 
 Partly sunny, with a high near 74.
Monday Night
 
 Partly cloudy, with a low around 54.
Tuesday
 
 Mostly sunny, with a high near 77.
Tuesday Night
 
 Partly cloudy, with a low around 56.
Wednesday
 
 Sunny, with a high near 78.
Wednesday Night
 
 Mostly clear, with a low around 56.
Thursday
 
 Mostly sunny, with a high near 78.

 

Forecast from NOAA-NWS for Storm Lake IA.