National Weather Service Forecast for: Le Mars IA
Issued by: National Weather Service Sioux Falls, SD
Updated: 1:32 am CDT Jun 30, 2026
 
Overnight

Overnight: Showers and possibly a thunderstorm before 4am, then a chance of showers and thunderstorms after 4am. Low around 71. South wind around 5 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Showers

 Tuesday

Tuesday: Partly sunny, then gradually becoming sunny, with a high near 94. South wind around 5 mph.
Becoming
Sunny

 Tuesday
Night
Tuesday Night: A 50 percent chance of showers and thunderstorms, mainly after 2am. Increasing clouds, with a low around 71. Light south wind becoming south southeast 5 to 10 mph after midnight.
Partly Cloudy
then Chance
T-storms
 Wednesday

Wednesday: Showers and thunderstorms likely before 3pm, then a chance of showers and thunderstorms after 4pm. Cloudy through mid morning, then gradual clearing, with a high near 91. South wind 10 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 60%.
Chance
T-storms then
Showers
Likely
 Wednesday
Night
Wednesday Night: A 30 percent chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 68. West southwest wind 5 to 10 mph becoming light and variable in the evening.
Chance
T-storms then
Chance
Showers
 Thursday

Thursday: A slight 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. Partly sunny, with a high near 92. Light south southeast wind increasing to 5 to 10 mph in the morning. Chance of precipitation is 40%.
Slight Chance
T-storms then
Chance
Showers
 Thursday
Night
Thursday Night: Showers likely before 7pm, then showers likely and possibly a thunderstorm between 7pm and 1am, then a chance of showers after 1am. Partly cloudy, with a low around 71. Chance of precipitation is 70%.
Showers
Likely

 Friday

Friday: Mostly sunny, with a high near 94.
Mostly Sunny

 Friday
Night
Friday Night: Showers likely and possibly a thunderstorm. Partly cloudy, with a low around 71. Chance of precipitation is 60%.
Showers
Likely
Lo 71 °F Hi 94 °F Lo 71 °F Hi 91 °F Lo 68 °F Hi 92 °F Lo 71 °F Hi 94 °F Lo 71 °F

Hazardous Weather Outlook
Severe Thunderstorm Watch
 

Overnight
 
 Showers and possibly a thunderstorm before 4am, then a chance of showers and thunderstorms after 4am. Low around 71. South wind around 5 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Tuesday
 
 Partly sunny, then gradually becoming sunny, with a high near 94. South wind around 5 mph.
Tuesday Night
 
 A 50 percent chance of showers and thunderstorms, mainly after 2am. Increasing clouds, with a low around 71. Light south wind becoming south southeast 5 to 10 mph after midnight.
Wednesday
 
 Showers and thunderstorms likely before 3pm, then a chance of showers and thunderstorms after 4pm. Cloudy through mid morning, then gradual clearing, with a high near 91. South wind 10 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 60%.
Wednesday Night
 
 A 30 percent chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 68. West southwest wind 5 to 10 mph becoming light and variable in the evening.
Thursday
 
 A slight 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. Partly sunny, with a high near 92. Light south southeast wind increasing to 5 to 10 mph in the morning. Chance of precipitation is 40%.
Thursday Night
 
 Showers likely before 7pm, then showers likely and possibly a thunderstorm between 7pm and 1am, then a chance of showers after 1am. Partly cloudy, with a low around 71. Chance of precipitation is 70%.
Friday
 
 Mostly sunny, with a high near 94.
Friday Night
 
 Showers likely and possibly a thunderstorm. Partly cloudy, with a low around 71. Chance of precipitation is 60%.
Independence Day
 
 Partly sunny, with a high near 91.
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 87.
Sunday Night
 
 Partly cloudy, with a low around 65.
Monday
 
 Mostly sunny, with a high near 88.

 

Forecast from NOAA-NWS for Le Mars IA.