National Weather Service Forecast for: Storm Lake IA
Issued by: National Weather Service Sioux Falls, SD
Updated: 1:53 am CDT Jun 30, 2026
 
Overnight

Overnight: A 50 percent chance of showers and thunderstorms, mainly before 5am. Mostly cloudy, with a low around 73. Southwest wind 10 to 15 mph.
Chance
T-storms

 Tuesday

Tuesday: A 10 percent chance of showers and thunderstorms before 7am. Mostly sunny, with a high near 94. South wind around 10 mph becoming west southwest in the afternoon.
Slight Chance
T-storms then
Mostly Sunny
 Tuesday
Night
Tuesday Night: A chance of showers and thunderstorms before 4am, then showers likely and possibly a thunderstorm between 4am and 5am, then a chance of showers and thunderstorms after 5am. Mostly cloudy, with a low around 72. South wind 5 to 10 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Partly Cloudy
then Showers
Likely
 Wednesday

Wednesday: Showers and thunderstorms likely before 3pm, then a chance of rain between 3pm and 4pm, then showers likely and possibly a thunderstorm after 4pm. Mostly cloudy, then gradually becoming sunny, with a high near 91. Breezy, with a south southwest wind 15 to 20 mph, with gusts as high as 25 mph. Chance of precipitation is 60%.
Showers
Likely and
Breezy
 Wednesday
Night
Wednesday Night: A 50 percent chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 70. South southwest wind 5 to 15 mph, with gusts as high as 20 mph.
Chance
T-storms then
Chance
Showers
 Thursday

Thursday: A chance of showers and thunderstorms before 1pm, then a chance of showers between 1pm and 4pm, then a chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 91. South southwest wind 5 to 10 mph. Chance of precipitation is 30%.
Chance
Showers

 Thursday
Night
Thursday Night: Showers likely before 7pm, then showers likely and possibly a thunderstorm between 7pm and 1am, then showers after 1am. Low around 71. Chance of precipitation is 80%.
Showers

 Friday

Friday: Mostly sunny, with a high near 92.
Mostly Sunny

 Friday
Night
Friday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Partly cloudy, with a low around 71. Chance of precipitation is 60%.
Chance
T-storms then
Showers
Likely
Lo 73 °F Hi 94 °F Lo 72 °F Hi 91 °F Lo 70 °F Hi 91 °F Lo 71 °F Hi 92 °F Lo 71 °F

Hazardous Weather Outlook
Severe Thunderstorm Watch
 

Overnight
 
 A 50 percent chance of showers and thunderstorms, mainly before 5am. Mostly cloudy, with a low around 73. Southwest wind 10 to 15 mph.
Tuesday
 
 A 10 percent chance of showers and thunderstorms before 7am. Mostly sunny, with a high near 94. South wind around 10 mph becoming west southwest in the afternoon.
Tuesday Night
 
 A chance of showers and thunderstorms before 4am, then showers likely and possibly a thunderstorm between 4am and 5am, then a chance of showers and thunderstorms after 5am. Mostly cloudy, with a low around 72. South wind 5 to 10 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Wednesday
 
 Showers and thunderstorms likely before 3pm, then a chance of rain between 3pm and 4pm, then showers likely and possibly a thunderstorm after 4pm. Mostly cloudy, then gradually becoming sunny, with a high near 91. Breezy, with a south southwest wind 15 to 20 mph, with gusts as high as 25 mph. Chance of precipitation is 60%.
Wednesday Night
 
 A 50 percent chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 70. South southwest wind 5 to 15 mph, with gusts as high as 20 mph.
Thursday
 
 A chance of showers and thunderstorms before 1pm, then a chance of showers between 1pm and 4pm, then a chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 91. South southwest wind 5 to 10 mph. Chance of precipitation is 30%.
Thursday Night
 
 Showers likely before 7pm, then showers likely and possibly a thunderstorm between 7pm and 1am, then showers after 1am. Low around 71. Chance of precipitation is 80%.
Friday
 
 Mostly sunny, with a high near 92.
Friday Night
 
 A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Partly cloudy, with a low around 71. Chance of precipitation is 60%.
Independence Day
 
 Partly sunny, with a high near 90.
Saturday Night
 
 Showers likely and possibly a thunderstorm. Partly cloudy, with a low around 68. Chance of precipitation is 60%.
Sunday
 
 A 30 percent chance of showers. Partly sunny, with a high near 86.
Sunday Night
 
 A 30 percent chance of showers. Partly cloudy, with a low around 65.
Monday
 
 Mostly sunny, with a high near 87.

 

Forecast from NOAA-NWS for Storm Lake IA.