Grundy Center, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Grundy Center, a city in Grundy County, Iowa.
Overnight
46°F
Chance Rain Showers
A chance of rain showers. Cloudy. Low around 46, with temperatures rising to around 48 overnight. West wind around 10 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Grundy Center
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 46°F | Chance Rain Showers | 10 mph W | 26% |
| Wednesday | 51°F | Chance Rain Showers | 13 to 18 mph W | 30% |
| Wednesday Night | 43°F | Chance Rain Showers | 15 mph W | 36% |
| Thursday | 53°F | Chance Rain Showers | 14 mph NW | 47% |
| Thursday Night | 36°F | Slight Chance Rain Showers then Mostly Cloudy | 7 to 12 mph N | 20% |
| Friday | 48°F | Mostly Sunny | 3 to 8 mph N | 3% |
| Friday Night | 28°F | Partly Cloudy | 2 mph NNW | 0% |
| Saturday | 51°F | Mostly Sunny | 0 to 5 mph W | 0% |
| Saturday Night | 34°F | Mostly Clear | 5 mph W | 2% |
| Sunday | 57°F | Sunny | 7 mph W | 2% |
| Sunday Night | 36°F | Clear | 5 mph SW | 0% |
| Monday | 62°F | Sunny | 5 to 10 mph SW | 0% |
| Monday Night | 40°F | Mostly Clear | 3 to 7 mph WNW | 0% |
| Tuesday | 61°F | Sunny | 3 mph NW | 0% |
Forecast source: National Weather Service (api.weather.gov) for Grundy Center (42.364, -92.774). Updated through the day.
Growing snapshot for Grundy Center
Last spring frost
Apr 29
First fall frost
Oct 9
Growing season
160 days
Hardiness zone
5a
More local growing data for Grundy Center: nearby ZIP 50638 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Grundy Ctr, Ia (1.9 mi from Grundy Center). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.