NWS Forecast for Sioux City IA

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

Updated: 3:38 am CST Dec 5, 2025

Today Mostly Cloudy	Tonight Mostly Cloudy	Saturday Chance Snow then Snow	Saturday Night Chance Snow then Mostly Cloudy	Sunday Partly Sunny	Sunday Night Mostly Cloudy	Monday Mostly Sunny	Monday Night Partly Cloudy	Tuesday Mostly Cloudy
Hi 36 °F	Lo 18 °F	Hi 28 °F	Lo 7 °F	Hi 13 °F	Lo 3 °F	Hi 31 °F	Lo 21 °F	Hi 39 °F

Hazardous Weather Outlook
Winter Weather Advisory

Today	Mostly cloudy, with a high near 36. South southeast wind 5 to 10 mph becoming northwest in the afternoon. Winds could gust as high as 20 mph.
Tonight	Mostly cloudy, with a low around 18. Northwest wind 5 to 10 mph becoming light and variable after midnight.
Saturday	Snow, mainly after noon. High near 28. Light east southeast wind becoming southeast 5 to 10 mph in the morning. Winds could gust as high as 20 mph. Chance of precipitation is 80%. New snow accumulation of around 3 inches.
Saturday Night	A 50 percent chance of snow before midnight. Mostly cloudy, with a low around 7. East southeast wind around 10 mph becoming north after midnight. New snow accumulation of less than one inch possible.
Sunday	Partly sunny, with a high near 13. North wind around 5 mph becoming east northeast in the afternoon.
Sunday Night	Mostly cloudy, with a low around 3. East northeast wind 5 to 10 mph becoming south after midnight.
Monday	Mostly sunny, with a high near 31.
Monday Night	Partly cloudy, with a low around 21.
Tuesday	Mostly cloudy, with a high near 39.
Tuesday Night	Mostly cloudy, with a low around 23.
Wednesday	Partly sunny, with a high near 27.
Wednesday Night	Mostly cloudy, with a low around 10.
Thursday	A 20 percent chance of snow. Mostly cloudy, with a high near 27.

Forecast from NOAA-NWS for Sioux City IA.