River Sioux, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for River Sioux, a community in Harrison County, Iowa.
This Afternoon
57°F
Rain Showers
Rain showers. Cloudy. High near 57, with temperatures falling to around 53 in the afternoon. North northwest wind around 21 mph, with gusts as high as 33 mph. Chance of precipitation is 90%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for River Sioux
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 57°F | Rain Showers | 21 mph NNW | 93% |
| Tonight | 41°F | Rain Showers | 14 to 18 mph NW | 85% |
| Wednesday | 51°F | Chance Rain Showers | 12 to 15 mph WNW | 30% |
| Wednesday Night | 39°F | Cloudy then Chance Rain Showers | 10 mph WNW | 35% |
| Thursday | 51°F | Chance Rain Showers | 9 to 13 mph NNW | 34% |
| Thursday Night | 36°F | Mostly Cloudy | 5 to 8 mph NNW | 2% |
| Friday | 52°F | Partly Sunny | 0 to 5 mph N | 0% |
| Friday Night | 33°F | Mostly Cloudy | 2 mph S | 0% |
| Saturday | 59°F | Mostly Sunny | 5 mph SW | 3% |
| Saturday Night | 37°F | Mostly Clear | 2 mph W | 5% |
| Sunday | 63°F | Sunny | 5 mph WSW | 2% |
| Sunday Night | 40°F | Mostly Clear | 6 mph S | 0% |
| Monday | 65°F | Sunny | 6 to 9 mph WSW | 0% |
| Monday Night | 40°F | Mostly Clear | 5 mph NNW | 0% |
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 Nov 3, 2026.