Newcastle, SD Weather & Growing Conditions
Overnight
49°F
Areas Of Smoke
Areas of smoke. Partly cloudy, with a low around 49. North wind around 6 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 49°F | Areas Of Smoke | 6 mph N | 1% |
| Tuesday | 73°F | Areas Of Smoke | 2 to 6 mph SE | 4% |
| Tuesday Night | 50°F | Partly Cloudy then Slight Chance Rain Showers | 3 to 9 mph SE | 17% |
| Wednesday | 83°F | Sunny | 5 mph SE | 2% |
| Wednesday Night | 54°F | Mostly Clear | 3 to 7 mph E | 1% |
| Thursday | 91°F | Sunny | 1 to 6 mph NW | 0% |
| Thursday Night | 58°F | Mostly Clear | 3 to 8 mph NE | 0% |
| Friday | 95°F | Sunny | 2 to 8 mph SE | 0% |
| Friday Night | 61°F | Mostly Clear | 5 to 10 mph E | 1% |
| Saturday | 98°F | Sunny | 3 to 13 mph NW | 0% |
| Saturday Night | 62°F | Mostly Clear | 5 to 14 mph E | 1% |
| Sunday | 97°F | Sunny | 5 to 17 mph SE | 3% |
| Sunday Night | 62°F | Partly Cloudy | 5 to 17 mph E | 9% |
| Monday | 94°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 5 to 18 mph S | 15% |
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 Aug 4, 2026.