Grand Mound, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Grand Mound, a city in Clinton County, Iowa.
This Afternoon
78°F
Showers And Thunderstorms Likely
Showers and thunderstorms likely. Partly sunny. High near 78, with temperatures falling to around 74 in the afternoon. South wind around 5 mph. Chance of precipitation is 70%.
7-day forecast for Grand Mound
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 78°F | Showers And Thunderstorms Likely | 5 mph S | 71% |
| Tonight | 63°F | Showers And Thunderstorms | 0 to 5 mph NE | 90% |
| Sunday | 67°F | Patchy Fog | 5 to 10 mph NE | 66% |
| Sunday Night | 56°F | Chance Rain Showers | 5 to 10 mph NE | 40% |
| Monday | 63°F | Rain Showers Likely | 10 mph NE | 67% |
| Monday Night | 52°F | Rain Showers Likely | 5 to 10 mph NE | 67% |
| Tuesday | 62°F | Rain Showers Likely | 5 to 10 mph NE | 58% |
| Tuesday Night | 49°F | Partly Cloudy | 5 mph NE | 9% |
| Wednesday | 64°F | Partly Sunny | 5 mph NE | 4% |
| Wednesday Night | 52°F | Partly Cloudy | 0 to 5 mph NE | 3% |
| Thursday | 67°F | Partly Sunny | 0 to 5 mph NE | 10% |
| Thursday Night | 55°F | Slight Chance Rain Showers | 0 mph | 17% |
| Friday | 69°F | Partly Sunny | 0 to 5 mph NE | 12% |
| Friday Night | 54°F | Partly Cloudy | 0 mph | 10% |
Forecast source: National Weather Service (api.weather.gov) for Grand Mound (41.824, -90.651). Updated through the day.
Growing snapshot for Grand Mound
Last spring frost
Apr 27
First fall frost
Oct 10
Growing season
165 days
Hardiness zone
5a
More local growing data for Grand Mound: nearby ZIP 52751 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Andover
Calamus
Camanche
Charlotte
Clinton
Delmar
DeWitt
Goose Lake
Lost Nation
Low Moor
Toronto
Welton
Wheatland
Climate data from the nearest NOAA station, Lowden, Ia (11.6 mi from Grand Mound). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.