Keystone, IA Weather & Growing Conditions
This Afternoon
69°F
Showers And Thunderstorms
Showers and thunderstorms. Mostly cloudy. High near 69, with temperatures falling to around 65 in the afternoon. Southeast wind around 10 mph. Chance of precipitation is 90%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 69°F | Showers And Thunderstorms | 10 mph SE | 91% |
| Tonight | 47°F | Showers And Thunderstorms Likely then Mostly Cloudy | 10 mph S | 59% |
| Wednesday | 54°F | Chance Rain Showers | 10 to 15 mph W | 34% |
| Wednesday Night | 43°F | Mostly Cloudy then Chance Rain Showers | 10 to 15 mph W | 30% |
| Thursday | 53°F | Chance Rain Showers | 10 mph NW | 51% |
| Thursday Night | 39°F | Slight Chance Rain Showers then Mostly Cloudy | 10 mph N | 16% |
| Friday | 51°F | Partly Sunny | 5 to 10 mph N | 2% |
| Friday Night | 32°F | Partly Cloudy | 0 to 5 mph NW | 1% |
| Saturday | 54°F | Mostly Sunny | 0 to 5 mph W | 2% |
| Saturday Night | 34°F | Mostly Clear | 0 to 5 mph W | 4% |
| Sunday | 59°F | Sunny | 5 mph W | 6% |
| Sunday Night | 36°F | Mostly Clear | 5 mph SW | 2% |
| Monday | 63°F | Sunny | 5 to 10 mph SW | 0% |
| Monday Night | 39°F | Mostly Clear | 5 mph W | 0% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Keystone, IA
Last spring frost
Apr 28
First fall frost
Oct 10
Growing season
165 days
Hardiness zone
5a
Explore more for Keystone, IA: full frost dates · planting calendar · Iowa frost dates
Climate data from the nearest NOAA station, Belle Plaine, Ia (9.7 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.