Sioux City, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Sioux City, a city in Woodbury County, Iowa.
Today
49°F
Chance Rain Showers
A chance of rain showers. Mostly cloudy, with a high near 49. West northwest wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 30%.
7-day forecast for Sioux City
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 49°F | Chance Rain Showers | 15 mph WNW | 33% |
| Tonight | 39°F | Chance Rain Showers | 10 mph NW | 33% |
| Thursday | 49°F | Mostly Cloudy | 10 to 15 mph NNW | 5% |
| Thursday Night | 34°F | Mostly Cloudy | 0 to 5 mph N | 0% |
| Friday | 49°F | Mostly Sunny | 0 mph | 0% |
| Friday Night | 31°F | Partly Cloudy | 0 mph | 0% |
| Saturday | 54°F | Mostly Sunny | 0 to 5 mph SSW | 0% |
| Saturday Night | 35°F | Mostly Clear | 5 mph WSW | 0% |
| Sunday | 59°F | Sunny | 5 mph SW | 0% |
| Sunday Night | 38°F | Clear | 5 mph S | 0% |
| Monday | 63°F | Sunny | 5 to 10 mph WSW | 0% |
| Monday Night | 39°F | Mostly Clear | 0 to 5 mph NW | 0% |
| Tuesday | 61°F | Mostly Sunny | 0 to 5 mph WNW | 0% |
| Tuesday Night | 42°F | Partly Cloudy | 0 mph | 1% |
Forecast source: National Weather Service (api.weather.gov) for Sioux City (42.495, -96.390). Updated through the day.
Growing snapshot for Sioux City
Last spring frost
Apr 29
First fall frost
Oct 7
Growing season
161 days
Hardiness zone
5a
More local growing data for Sioux City: nearby ZIP 51101 weather · frost dates · planting calendar · Iowa frost dates
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Climate data from the nearest NOAA station, Sioux City Ang, Ia (6.8 mi from Sioux City). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.