River Sioux, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for River Sioux, a community in Harrison County, Iowa.
Today
75°F
Chance Rain Showers then Slight Chance Showers And Thunderstorms
A chance of rain showers before 1pm, then a slight chance of showers and thunderstorms. Mostly cloudy, with a high near 75. North northwest wind around 9 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for River Sioux
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 75°F | Chance Rain Showers then Slight Chance Showers And Thunderstorms | 9 mph NNW | 28% |
| Tonight | 60°F | Slight Chance Showers And Thunderstorms | 10 mph N | 20% |
| Sunday | 64°F | Chance Rain Showers | 10 mph NNE | 40% |
| Sunday Night | 55°F | Chance Rain Showers | 6 to 9 mph NE | 45% |
| Monday | 59°F | Rain Showers Likely | 9 mph ENE | 61% |
| Monday Night | 50°F | Chance Rain Showers then Mostly Cloudy | 3 to 8 mph ENE | 43% |
| Tuesday | 61°F | Partly Sunny | 6 mph E | 9% |
| Tuesday Night | 46°F | Partly Cloudy | 5 mph ESE | 1% |
| Wednesday | 65°F | Mostly Sunny | 2 to 6 mph SE | 3% |
| Wednesday Night | 52°F | Partly Cloudy then Chance Rain Showers | 5 mph SE | 30% |
| Thursday | 66°F | Chance Rain Showers | 3 to 7 mph SE | 31% |
| Thursday Night | 56°F | Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms | 6 mph SE | 21% |
| Friday | 68°F | Slight Chance Showers And Thunderstorms | 3 to 7 mph SE | 21% |
| Friday Night | 56°F | Mostly Cloudy then Slight Chance Rain Showers | 6 mph SE | 23% |
Forecast source: National Weather Service (api.weather.gov) for River Sioux (41.802, -96.048). Updated through the day.
Growing snapshot for River Sioux
Last spring frost
May 1
First fall frost
Oct 3
Growing season
155 days
Hardiness zone
5a
More local growing data for River Sioux: nearby ZIP 51545 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
California Junction
Dunlap
Little Sioux
Logan
Loveland
Magnolia
Missouri Valley
Modale
Mondamin
Persia
Pisgah
Woodbine
Climate data from the nearest NOAA station, Little Sioux 2 Nw, Ia (2.5 mi from River Sioux). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.