Sioux City, IA Weather & Growing Conditions
Tonight
59°F
Cloudy
Cloudy, with a low around 59. North northeast wind around 10 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 59°F | Cloudy | 10 mph NNE | 5% |
| Sunday | 63°F | Patchy Fog then Chance Rain Showers | 10 mph NE | 47% |
| Sunday Night | 53°F | Rain Showers | 5 to 10 mph NE | 90% |
| Monday | 58°F | Showers And Thunderstorms | 5 to 10 mph NE | 90% |
| Monday Night | 48°F | Slight Chance Rain Showers then Mostly Cloudy | 5 mph NE | 19% |
| Tuesday | 62°F | Partly Sunny | 5 mph ENE | 4% |
| Tuesday Night | 46°F | Partly Cloudy | 5 mph ESE | 1% |
| Wednesday | 64°F | Mostly Sunny | 5 to 10 mph SE | 7% |
| Wednesday Night | 52°F | Chance Showers And Thunderstorms | 5 to 10 mph SE | 49% |
| Thursday | 67°F | Chance Showers And Thunderstorms | 5 to 10 mph SSE | 49% |
| Thursday Night | 56°F | Slight Chance Rain Showers | 5 mph SE | 15% |
| Friday | 70°F | Slight Chance Rain Showers | 5 to 10 mph SE | 17% |
| Friday Night | 59°F | Mostly Cloudy then Chance Rain Showers | 5 to 10 mph SE | 28% |
| Saturday | 70°F | Chance Rain Showers | 10 mph SSE | 43% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Sioux City, IA
Last spring frost
Apr 29
First fall frost
Oct 7
Growing season
161 days
Hardiness zone
5a
Explore more for Sioux City, IA: full frost dates · planting calendar · Iowa frost dates
Climate data from the nearest NOAA station, Sioux City Ang, Ia (9.6 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.