Grundy Center, IA Weather & Growing Conditions
This Afternoon
76°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Mostly cloudy. High near 76, with temperatures falling to around 72 in the afternoon. North wind around 6 mph. Chance of precipitation is 50%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 76°F | Chance Showers And Thunderstorms | 6 mph N | 51% |
| Tonight | 59°F | Chance Showers And Thunderstorms | 7 to 12 mph N | 39% |
| Sunday | 66°F | Chance Rain Showers then Chance Drizzle | 15 mph NE | 46% |
| Sunday Night | 53°F | Chance Drizzle then Chance Rain Showers | 14 mph ENE | 49% |
| Monday | 60°F | Rain Showers Likely | 14 mph NE | 74% |
| Monday Night | 49°F | Rain Showers Likely | 8 to 12 mph NE | 74% |
| Tuesday | 60°F | Chance Rain Showers then Partly Sunny | 9 mph NE | 26% |
| Tuesday Night | 46°F | Partly Cloudy | 3 to 7 mph NE | 4% |
| Wednesday | 64°F | Mostly Sunny | 6 mph ENE | 0% |
| Wednesday Night | 50°F | Partly Cloudy | 3 mph E | 5% |
| Thursday | 66°F | Slight Chance Rain Showers | 3 mph ESE | 19% |
| Thursday Night | 54°F | Slight Chance Rain Showers | 3 mph ESE | 21% |
| Friday | 69°F | Slight Chance Rain Showers then Partly Sunny | 1 to 5 mph E | 16% |
| Friday Night | 56°F | Mostly Cloudy | 3 mph E | 7% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Grundy Center, IA
Last spring frost
Apr 29
First fall frost
Oct 9
Growing season
160 days
Hardiness zone
5a
Explore more for Grundy Center, IA: full frost dates · planting calendar · Iowa frost dates
Climate data from the nearest NOAA station, Grundy Ctr, Ia (1.9 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.