Newcastle, OK Weather & Growing Conditions
Today
103°F
Sunny
Sunny, with a high near 103. Heat index values as high as 104. South wind around 12 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 103°F | Sunny | 12 mph S | 1% |
| Tonight | 76°F | Mostly Clear | 8 to 13 mph S | 2% |
| Wednesday | 102°F | Sunny | 9 to 14 mph SSW | 3% |
| Wednesday Night | 77°F | Mostly Clear | 13 mph S | 4% |
| Thursday | 100°F | Mostly Sunny | 12 mph SSW | 13% |
| Thursday Night | 75°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 13 mph SSE | 20% |
| Friday | 98°F | Chance Showers And Thunderstorms | 12 mph S | 31% |
| Friday Night | 73°F | Slight Chance Showers And Thunderstorms | 9 to 13 mph S | 21% |
| Saturday | 98°F | Sunny | 8 to 12 mph S | 13% |
| Saturday Night | 74°F | Clear | 14 mph S | 4% |
| Sunday | 98°F | Sunny | 10 to 15 mph S | 1% |
| Sunday Night | 75°F | Clear | 15 mph S | 0% |
| Monday | 99°F | Sunny | 14 to 17 mph S | 1% |
| Monday Night | 75°F | Mostly Clear | 17 mph S | 1% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Newcastle, OK
Last spring frost
Mar 31
First fall frost
Nov 5
Growing season
219 days
Hardiness zone
7b
Explore more for Newcastle, OK: full frost dates · planting calendar · Oklahoma frost dates
Climate data from the nearest NOAA station, Norman 2Nw Mesonet, Ok (8.3 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.