Keystone, IN Weather & Growing Conditions
Overnight
67°F
Showers And Thunderstorms Likely
Showers and thunderstorms likely. Cloudy, with a low around 67. Southeast wind around 0 mph. Chance of precipitation is 70%. New rainfall amounts between a half and three quarters of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 67°F | Showers And Thunderstorms Likely | 0 mph | 73% |
| Sunday | 79°F | Showers And Thunderstorms Likely | 0 to 10 mph NE | 74% |
| Sunday Night | 57°F | Showers And Thunderstorms Likely | 10 to 15 mph NE | 68% |
| Monday | 66°F | Chance Rain Showers | 15 mph NE | 42% |
| Monday Night | 53°F | Slight Chance Rain Showers then Mostly Cloudy | 10 to 15 mph NE | 18% |
| Tuesday | 64°F | Mostly Cloudy | 10 to 15 mph NE | 14% |
| Tuesday Night | 53°F | Chance Rain Showers | 10 to 15 mph NE | 32% |
| Wednesday | 67°F | Chance Showers And Thunderstorms | 10 mph NE | 39% |
| Wednesday Night | 53°F | Chance Showers And Thunderstorms | 5 to 10 mph NE | 39% |
| Thursday | 68°F | Mostly Cloudy | 5 to 10 mph NE | 8% |
| Thursday Night | 52°F | Mostly Cloudy | 0 to 10 mph NE | 10% |
| Friday | 71°F | Partly Sunny | 5 mph NE | 10% |
| Friday Night | 51°F | Partly Cloudy | 0 to 5 mph NE | 4% |
| Saturday | 73°F | Mostly Sunny | 0 to 5 mph NE | 2% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Keystone, IN
Last spring frost
Apr 22
First fall frost
Oct 22
Growing season
181 days
Hardiness zone
6a
Explore more for Keystone, IN: full frost dates · planting calendar · Indiana frost dates
Climate data from the nearest NOAA station, Hartford City 4 Ese, In (13.6 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.