Grand River, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Grand River, a city in Decatur County, Iowa.
Overnight
44°F
Cloudy
Cloudy. Low around 44, with temperatures rising to around 46 overnight. West northwest wind around 14 mph, with gusts as high as 20 mph.
7-day forecast for Grand River
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 44°F | Cloudy | 14 mph WNW | 12% |
| Wednesday | 52°F | Cloudy | 15 mph W | 14% |
| Wednesday Night | 42°F | Mostly Cloudy then Slight Chance Rain Showers | 10 mph W | 15% |
| Thursday | 53°F | Chance Rain Showers | 10 mph NW | 26% |
| Thursday Night | 40°F | Mostly Cloudy | 8 mph NNW | 8% |
| Friday | 51°F | Partly Sunny | 3 to 7 mph N | 6% |
| Friday Night | 31°F | Partly Cloudy | 2 mph ENE | 0% |
| Saturday | 53°F | Mostly Sunny | 3 mph SSW | 0% |
| Saturday Night | 35°F | Mostly Clear | 3 mph W | 0% |
| Sunday | 59°F | Sunny | 6 mph W | 0% |
| Sunday Night | 37°F | Clear | 5 mph SW | 0% |
| Monday | 65°F | Sunny | 5 to 9 mph SW | 0% |
| Monday Night | 41°F | Mostly Clear | 6 mph W | 0% |
| Tuesday | 65°F | Sunny | 5 mph NNW | 0% |
Forecast source: National Weather Service (api.weather.gov) for Grand River (40.819, -93.963). Updated through the day.
Growing snapshot for Grand River
Last spring frost
Apr 23
First fall frost
Oct 17
Growing season
176 days
Hardiness zone
5b
More local growing data for Grand River: nearby ZIP 50108 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Beaconsfield, Ia (4.5 mi from Grand River). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.