51101 Weather (Sioux City, IA)

Weather forecast for: Sioux City IA

Last Update: 7:48 pm CDT Aug 29, 2026

Tonight: Partly cloudy, with a low around 74. South southeast wind around 5 mph.

Sunday: Mostly cloudy, then gradually becoming sunny, with a high near 93. Heat index values as high as 100. Southeast wind 5 to 10 mph becoming south southwest in the afternoon.

Sunday Night: Partly cloudy, with a low around 73. South southwest wind around 5 mph becoming calm in the evening.

Monday: Partly sunny, with a high near 90. West northwest wind around 5 mph becoming south in the afternoon.

Monday Night: A 30 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 71. Calm wind.

Tuesday: A 20 percent chance of showers and thunderstorms before 1pm. Cloudy, then gradually becoming mostly sunny, with a high near 89. Calm wind becoming southeast around 5 mph in the afternoon.

Tuesday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 68. Chance of precipitation is 30%.

Wednesday: Mostly sunny, with a high near 89.

Wednesday Night: A 30 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 69.

Thursday: Partly sunny, with a high near 89.

Thursday Night: A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 68.

Friday: Mostly sunny, with a high near 89.

Friday Night: Partly cloudy, with a low around 70.

Saturday: Partly sunny, with a high near 88.