Newcastle, SD Weather & Growing Conditions
Overnight
55°F
Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms before 3am. Cloudy, with a low around 55. Southeast wind around 5 mph. Chance of precipitation is 20%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 55°F | Slight Chance Showers And Thunderstorms | 5 mph SE | 21% |
| Saturday | 70°F | Chance Showers And Thunderstorms | 3 to 12 mph SE | 48% |
| Saturday Night | 48°F | Showers And Thunderstorms | 14 mph SE | 87% |
| Sunday | 61°F | Showers And Thunderstorms | 10 to 14 mph SE | 89% |
| Sunday Night | 45°F | Showers And Thunderstorms Likely | 5 to 8 mph SE | 71% |
| Monday | 64°F | Partly Sunny | 5 to 14 mph SE | 12% |
| Monday Night | 44°F | Partly Cloudy | 15 mph SE | 1% |
| Tuesday | 71°F | Mostly Sunny | 15 mph SE | 1% |
| Tuesday Night | 49°F | Mostly Clear | 12 to 17 mph SE | 13% |
| Wednesday | 76°F | Mostly Sunny | 6 to 10 mph SE | 12% |
| Wednesday Night | 49°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 2 to 8 mph SE | 15% |
| Thursday | 79°F | Sunny | 1 to 7 mph SE | 4% |
| Thursday Night | 51°F | Mostly Clear | 8 mph SE | 2% |
| Friday | 79°F | Mostly Sunny | 6 to 16 mph SE | 6% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Newcastle, SD
Last spring frost
May 13
First fall frost
Oct 3
Growing season
143 days
Hardiness zone
4b
Explore more for Newcastle, SD: full frost dates · planting calendar · South Dakota frost dates
Climate data from the nearest NOAA station, Newcastle, Wy (17.2 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.