NWS Forecast for Le Mars IA

National Weather Service Forecast for: Le Mars IA
Issued by: National Weather Service Sioux Falls, SD

Updated: 2:39 am CDT Aug 20, 2026

Overnight Patchy Dense Fog	Thursday Patchy Dense Fog then Sunny	Thursday Night Slight Chance T-storms then Mostly Clear	Friday Sunny	Friday Night Mostly Clear	Saturday Sunny	Saturday Night Partly Cloudy	Sunday Partly Sunny	Sunday Night Mostly Cloudy then Chance T-storms
Lo 57 °F	Hi 81 °F	Lo 62 °F	Hi 83 °F	Lo 60 °F	Hi 80 °F	Lo 57 °F	Hi 77 °F	Lo 60 °F

Hazardous Weather Outlook
Dense Fog Advisory

Overnight	Patchy dense fog. Otherwise, mostly clear, with a low around 57. Calm wind.
Thursday	Patchy dense fog before 10am. Otherwise, sunny, with a high near 81. Light south wind becoming south southwest 5 to 10 mph in the morning.
Thursday Night	A slight chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 11pm. Mostly clear, with a low around 62. South southwest wind 5 to 10 mph becoming light south in the evening. Chance of precipitation is 20%.
Friday	Sunny, with a high near 83. Calm wind becoming north around 5 mph.
Friday Night	Mostly clear, with a low around 60. Calm wind.
Saturday	Sunny, with a high near 80. Calm wind becoming north northeast around 5 mph in the afternoon.
Saturday Night	Partly cloudy, with a low around 57.
Sunday	Partly sunny, with a high near 77.
Sunday Night	A 50 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 60.
Monday	Partly sunny, with a high near 79.
Monday Night	Partly cloudy, with a low around 62.
Tuesday	Mostly sunny, with a high near 82.
Tuesday Night	Partly cloudy, with a low around 61.
Wednesday	Mostly sunny, with a high near 81.

Forecast from NOAA-NWS for Le Mars IA.