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
66°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Cloudy. Low around 66, with temperatures rising to around 72 overnight. North northwest wind around 5 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Sioux City
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 66°F | Chance Showers And Thunderstorms | 5 mph NNW | 34% |
| Saturday | 71°F | Chance Showers And Thunderstorms then Mostly Cloudy | 5 to 10 mph NNW | 35% |
| Saturday Night | 59°F | Cloudy | 5 to 10 mph N | 14% |
| Sunday | 65°F | Chance Rain Showers | 10 mph NE | 30% |
| Sunday Night | 55°F | Rain Showers Likely | 5 to 10 mph NE | 66% |
| Monday | 60°F | Rain Showers Likely | 5 to 10 mph ENE | 66% |
| Monday Night | 49°F | Chance Rain Showers then Mostly Cloudy | 5 mph ENE | 36% |
| Tuesday | 63°F | Partly Sunny | 5 mph E | 6% |
| Tuesday Night | 47°F | Partly Cloudy | 5 mph ESE | 1% |
| Wednesday | 66°F | Mostly Sunny | 5 to 10 mph SE | 6% |
| Wednesday Night | 52°F | Partly Cloudy then Chance Rain Showers | 5 mph SE | 28% |
| Thursday | 67°F | Chance Rain Showers | 5 to 10 mph SE | 33% |
| Thursday Night | 55°F | Slight Chance Rain Showers | 5 mph SE | 17% |
| Friday | 70°F | Slight Chance Rain Showers | 5 to 10 mph SE | 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 Sep 19, 2026.