New Castle, IN Weather & Growing Conditions
Today
67°F
Rain Showers Likely
Rain showers likely before 5pm. Cloudy. High near 67, with temperatures falling to around 64 in the afternoon. South southwest wind 12 to 15 mph, with gusts as high as 29 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 |
|---|---|---|---|---|
| Today | 67°F | Rain Showers Likely | 12 to 15 mph SSW | 72% |
| Tonight | 47°F | Mostly Cloudy | 7 to 10 mph SW | 7% |
| Thursday | 61°F | Partly Sunny | 8 to 13 mph SW | 3% |
| Thursday Night | 43°F | Mostly Cloudy | 1 to 7 mph WSW | 6% |
| Friday | 55°F | Isolated Rain Showers | 1 to 9 mph WNW | 19% |
| Friday Night | 34°F | Isolated Rain Showers then Mostly Cloudy | 3 to 9 mph NW | 19% |
| Saturday | 52°F | Partly Sunny | 3 to 7 mph NW | 3% |
| Saturday Night | 31°F | Partly Cloudy | 0 to 3 mph WNW | 2% |
| Sunday | 56°F | Sunny | 1 to 9 mph W | 3% |
| Sunday Night | 31°F | Mostly Clear | 2 to 6 mph W | 4% |
| Monday | 59°F | Sunny | 1 to 7 mph WSW | 3% |
| Monday Night | 36°F | Mostly Clear | 5 mph SW | 1% |
| Tuesday | 63°F | Sunny | 3 to 7 mph W | 1% |
| Tuesday Night | 36°F | Mostly Clear | 3 mph NW | 1% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for New Castle, IN
Last spring frost
Apr 27
First fall frost
Oct 17
Growing season
173 days
Hardiness zone
6a
Explore more for New Castle, IN: full frost dates · planting calendar · Indiana frost dates
Climate data from the nearest NOAA station, New Castle 3 Sw, In (3 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.