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.
Overnight
66°F
Patchy Fog
Patchy fog and showers and thunderstorms likely. Cloudy, with a low around 66. North northwest wind around 5 mph. Chance of precipitation is 60%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for North Sioux City
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 66°F | Patchy Fog | 5 mph NNW | 64% |
| Saturday | 71°F | Patchy Fog then Cloudy | 5 to 10 mph NNW | 41% |
| Saturday Night | 58°F | Cloudy | 10 mph N | 14% |
| Sunday | 65°F | Chance Rain Showers | 10 mph NE | 28% |
| Sunday Night | 54°F | Rain Showers Likely | 5 to 10 mph ENE | 66% |
| Monday | 61°F | Rain Showers Likely | 5 to 10 mph ENE | 66% |
| Monday Night | 49°F | Chance Rain Showers then Mostly Cloudy | 5 to 10 mph ENE | 32% |
| Tuesday | 63°F | Partly Sunny | 5 to 10 mph E | 5% |
| Tuesday Night | 46°F | Partly Cloudy | 5 mph SE | 1% |
| Wednesday | 66°F | Mostly Sunny | 5 to 10 mph SE | 7% |
| Wednesday Night | 52°F | Partly Cloudy then Chance Rain Showers | 5 mph SE | 28% |
| Thursday | 68°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 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 Sep 19, 2026.