New Castle, IN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for New Castle, a city in Henry County, Indiana.
This Afternoon
68°F
Slight Chance Light Rain
A slight chance of rain. Mostly cloudy. High near 68, with temperatures falling to around 65 in the afternoon. West southwest wind around 10 mph, with gusts as high as 21 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for New Castle
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 68°F | Slight Chance Light Rain | 10 mph WSW | 17% |
| Tonight | 46°F | Slight Chance Light Rain then Cloudy | 5 to 10 mph WSW | 18% |
| Thursday | 61°F | Partly Sunny | 6 to 13 mph SW | 1% |
| Thursday Night | 41°F | Slight Chance Light Rain | 2 to 7 mph W | 23% |
| Friday | 53°F | Slight Chance Light Rain | 3 to 10 mph NW | 18% |
| Friday Night | 33°F | Slight Chance Light Rain then Mostly Cloudy | 3 to 8 mph NW | 16% |
| Saturday | 52°F | Mostly Sunny | 3 to 7 mph NW | 0% |
| Saturday Night | 29°F | Partly Cloudy | 0 to 3 mph WNW | 0% |
| Sunday | 55°F | Sunny | 1 to 9 mph W | 1% |
| Sunday Night | 31°F | Mostly Clear | 1 to 6 mph W | 1% |
| Monday | 59°F | Sunny | 1 to 7 mph W | 0% |
| Monday Night | 35°F | Clear | 5 mph WSW | 0% |
| Tuesday | 61°F | Sunny | 7 mph W | 1% |
| Tuesday Night | 35°F | Mostly Clear | 0 to 3 mph NW | 3% |
Forecast source: National Weather Service (api.weather.gov) for New Castle (39.920, -85.370). Updated through the day.
Growing snapshot for New Castle
Last spring frost
Apr 27
First fall frost
Oct 17
Growing season
173 days
Hardiness zone
6a
More local growing data for New Castle: nearby ZIP 47362 weather · frost dates · planting calendar · Indiana frost dates
Nearby towns & communities
Cadiz
Dunreith
Greensboro
Kennard
Knightstown
Lewisville
Middletown
Millville
Mooreland
Mount Summit
New Lisbon
Shirley
Spiceland
Springport
Straughn
Sulphur Springs
Westwood
Climate data from the nearest NOAA station, New Castle 3 Sw, In (3 mi from New Castle). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 5, 2026.