Keystone, IA Weather & Growing Conditions
Overnight
66°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms before 4am, then patchy fog and showers and thunderstorms likely. Cloudy, with a low around 66. Southeast wind 5 to 10 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 66°F | Chance Showers And Thunderstorms | 5 to 10 mph SE | 73% |
| Saturday | 80°F | Patchy Fog | 5 to 10 mph S | 77% |
| Saturday Night | 61°F | Showers And Thunderstorms Likely | 5 to 10 mph N | 67% |
| Sunday | 67°F | Rain Showers Likely | 10 to 15 mph NE | 59% |
| Sunday Night | 55°F | Chance Rain Showers | 10 to 15 mph NE | 47% |
| Monday | 63°F | Chance Rain Showers | 10 to 15 mph NE | 47% |
| Monday Night | 50°F | Chance Rain Showers | 10 mph NE | 37% |
| Tuesday | 61°F | Chance Rain Showers then Partly Sunny | 10 mph NE | 27% |
| Tuesday Night | 45°F | Mostly Clear | 5 mph NE | 4% |
| Wednesday | 66°F | Sunny | 5 mph NE | 0% |
| Wednesday Night | 50°F | Partly Cloudy | 0 to 5 mph NE | 3% |
| Thursday | 67°F | Partly Sunny | 5 mph E | 8% |
| Thursday Night | 53°F | Partly Cloudy | 0 to 5 mph E | 7% |
| Friday | 69°F | Mostly Sunny | 5 mph E | 6% |
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 Sep 19, 2026.