Sioux City, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Sioux City, a city in Woodbury County, Iowa.
Overnight
65°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Mostly cloudy, with a low around 65. North northwest wind around 10 mph, with gusts as high as 25 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Sioux City
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 65°F | Chance Showers And Thunderstorms | 10 mph NNW | 37% |
| Tuesday | 72°F | Patchy Smoke | 5 to 10 mph N | 76% |
| Tuesday Night | 57°F | Patchy Smoke | 0 to 5 mph N | 48% |
| Wednesday | 76°F | Partly Sunny | 0 to 5 mph ENE | 5% |
| Wednesday Night | 55°F | Mostly Clear | 0 mph | 1% |
| Thursday | 82°F | Sunny | 0 to 5 mph S | 0% |
| Thursday Night | 64°F | Mostly Clear | 5 to 10 mph S | 1% |
| Friday | 87°F | Sunny | 5 to 10 mph S | 3% |
| Friday Night | 67°F | Mostly Clear | 5 to 10 mph S | 11% |
| Saturday | 91°F | Sunny | 5 to 15 mph S | 4% |
| Saturday Night | 70°F | Slight Chance Showers And Thunderstorms | 10 to 15 mph SSE | 15% |
| Sunday | 90°F | Mostly Sunny | 5 to 10 mph SE | 14% |
| Sunday Night | 71°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 10 mph SE | 17% |
| Monday | 90°F | Slight Chance Showers And Thunderstorms then Mostly Sunny | 5 to 10 mph E | 17% |
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 Aug 4, 2026.