North Sioux City, SD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for North Sioux City, a city in Union County, South Dakota.
Today
72°F
Patchy Smoke
Patchy smoke and a chance of showers and thunderstorms before 10am, then patchy smoke and scattered showers and thunderstorms between 10am and 1pm, then patchy smoke and showers and thunderstorms between 1pm and 3pm, then scattered showers and thunderstorms between 3pm and 4pm, then scattered showers and thunderstorms between 4pm and 5pm, then patchy smoke and scattered showers and thunderstorms. Mostly cloudy, with a high near 72. North wind 5 to 15 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for North Sioux City
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 72°F | Patchy Smoke | 5 to 15 mph N | 82% |
| Tonight | 56°F | Patchy Smoke then Mostly Cloudy | 0 to 5 mph N | 47% |
| Wednesday | 76°F | Partly Sunny | 0 to 5 mph E | 5% |
| Wednesday Night | 54°F | Mostly Clear | 0 to 5 mph SSE | 1% |
| Thursday | 81°F | Mostly Sunny | 0 to 10 mph S | 0% |
| Thursday Night | 63°F | Mostly Clear | 5 to 10 mph S | 2% |
| Friday | 87°F | Sunny | 5 to 10 mph SSW | 3% |
| Friday Night | 66°F | Mostly Clear | 5 to 10 mph S | 10% |
| Saturday | 91°F | Sunny | 5 to 15 mph S | 4% |
| Saturday Night | 69°F | Mostly Clear | 10 to 15 mph SSE | 14% |
| Sunday | 90°F | Mostly Sunny | 10 mph SE | 13% |
| Sunday Night | 70°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 10 to 15 mph SE | 16% |
| Monday | 90°F | Slight Chance Showers And Thunderstorms then Mostly Sunny | 10 to 15 mph E | 16% |
| Monday Night | 69°F | Slight Chance Showers And Thunderstorms | 10 to 15 mph E | 21% |
Forecast source: National Weather Service (api.weather.gov) for North Sioux City (42.531, -96.500). Updated through the day.
Growing snapshot for North Sioux City
Last spring frost
Apr 29
First fall frost
Oct 7
Growing season
161 days
Hardiness zone
5a
More local growing data for North Sioux City: nearby ZIP 57049 weather · frost dates · planting calendar · South Dakota frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Sioux City Ang, Ia (11 mi from North Sioux City). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.