Riverton, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Riverton, a city in Fremont County, Iowa.
Tonight
69°F
Mostly Cloudy then Chance Showers And Thunderstorms
A chance of showers and thunderstorms after midnight. Mostly cloudy. Low around 69, with temperatures rising to around 71 overnight. South wind 6 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Riverton
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 69°F | Mostly Cloudy then Chance Showers And Thunderstorms | 6 to 10 mph S | 41% |
| Saturday | 83°F | Chance Showers And Thunderstorms | 7 mph WNW | 42% |
| Saturday Night | 64°F | Chance Showers And Thunderstorms | 7 mph N | 47% |
| Sunday | 69°F | Chance Rain Showers | 9 mph NNE | 50% |
| Sunday Night | 60°F | Chance Showers And Thunderstorms | 5 to 8 mph NE | 50% |
| Monday | 63°F | Chance Rain Showers | 9 mph NE | 43% |
| Monday Night | 54°F | Chance Rain Showers then Mostly Cloudy | 3 to 8 mph NNE | 40% |
| Tuesday | 62°F | Mostly Cloudy | 7 mph NE | 7% |
| Tuesday Night | 50°F | Mostly Cloudy | 5 mph ENE | 4% |
| Wednesday | 66°F | Mostly Sunny | 3 mph ESE | 3% |
| Wednesday Night | 54°F | Mostly Cloudy | 2 mph ESE | 12% |
| Thursday | 67°F | Chance Rain Showers | 1 to 5 mph SE | 33% |
| Thursday Night | 57°F | Slight Chance Rain Showers | 2 mph SE | 21% |
| Friday | 68°F | Slight Chance Rain Showers | 5 mph SE | 19% |
Forecast source: National Weather Service (api.weather.gov) for Riverton (40.687, -95.569). Updated through the day.
Growing snapshot for Riverton
Last spring frost
Apr 19
First fall frost
Oct 19
Growing season
182 days
Hardiness zone
5b
More local growing data for Riverton: nearby ZIP 51650 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Sidney 1Sse, Ia (6.3 mi from Riverton). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.