Grundy Center, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Grundy Center, a city in Grundy County, Iowa.
Today
79°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms before 1pm, then a chance of showers and thunderstorms. Mostly cloudy. High near 79, with temperatures falling to around 76 in the afternoon. West wind around 8 mph. Chance of precipitation is 50%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Grundy Center
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 79°F | Chance Showers And Thunderstorms | 8 mph W | 46% |
| Tonight | 60°F | Chance Showers And Thunderstorms | 8 to 12 mph N | 33% |
| Sunday | 66°F | Chance Rain Showers then Chance Drizzle | 12 to 15 mph NE | 39% |
| Sunday Night | 54°F | Chance Rain Showers | 14 mph ENE | 42% |
| Monday | 62°F | Chance Rain Showers | 14 mph NE | 42% |
| Monday Night | 49°F | Chance Rain Showers | 7 to 13 mph NE | 39% |
| Tuesday | 61°F | Slight Chance Rain Showers then Partly Sunny | 9 mph ENE | 15% |
| Tuesday Night | 45°F | Partly Cloudy | 2 to 7 mph ENE | 2% |
| Wednesday | 65°F | Sunny | 6 mph ENE | 1% |
| Wednesday Night | 49°F | Partly Cloudy | 3 mph E | 4% |
| Thursday | 66°F | Partly Sunny | 5 mph E | 11% |
| Thursday Night | 52°F | Partly Cloudy | 3 mph E | 8% |
| Friday | 69°F | Mostly Sunny | 1 to 5 mph ESE | 4% |
| Friday Night | 53°F | Partly Cloudy | 5 mph ESE | 9% |
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 Sep 19, 2026.