Sioux City, IA Weather & Growing Conditions
Today
69°F
Patchy Smoke
Patchy smoke and showers and thunderstorms before 3pm, then patchy smoke and scattered showers and thunderstorms. Mostly cloudy, with a high near 69. North wind 5 to 10 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 69°F | Patchy Smoke | 5 to 10 mph N | 82% |
| Tonight | 56°F | Patchy Smoke then Mostly Cloudy | 0 to 5 mph NNE | 48% |
| Wednesday | 75°F | Partly Sunny | 0 to 5 mph E | 4% |
| Wednesday Night | 54°F | Mostly Clear | 0 mph | 1% |
| Thursday | 81°F | Mostly Sunny | 0 to 10 mph S | 0% |
| Thursday Night | 62°F | Mostly Clear | 5 to 10 mph S | 1% |
| Friday | 86°F | Sunny | 5 to 10 mph S | 3% |
| Friday Night | 66°F | Mostly Clear | 5 to 10 mph S | 11% |
| Saturday | 89°F | Sunny | 5 to 15 mph S | 4% |
| Saturday Night | 68°F | Slight Chance Showers And Thunderstorms | 10 to 15 mph SSE | 15% |
| Sunday | 89°F | Mostly Sunny | 10 mph SE | 14% |
| Sunday Night | 70°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 10 mph SE | 17% |
| Monday | 89°F | Slight Chance Showers And Thunderstorms then Mostly Sunny | 10 to 15 mph E | 17% |
| Monday Night | 69°F | Slight Chance Showers And Thunderstorms | 10 to 15 mph E | 22% |
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 (11.8 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.