Newcastle, OK Weather & Growing Conditions
Today
98°F
Sunny
Sunny, with a high near 98. Heat index values as high as 99. South southwest wind around 15 mph, with gusts as high as 23 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 98°F | Sunny | 15 mph SSW | 1% |
| Tonight | 74°F | Mostly Clear | 14 mph S | 11% |
| Sunday | 94°F | Showers And Thunderstorms Likely | 13 mph S | 71% |
| Sunday Night | 66°F | Showers And Thunderstorms Likely | 6 to 9 mph E | 71% |
| Monday | 84°F | Chance Showers And Thunderstorms then Mostly Sunny | 8 to 12 mph NNE | 32% |
| Monday Night | 61°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 10 mph NE | 21% |
| Tuesday | 80°F | Slight Chance Showers And Thunderstorms then Mostly Sunny | 13 mph NE | 21% |
| Tuesday Night | 58°F | Partly Cloudy | 10 mph NE | 6% |
| Wednesday | 82°F | Mostly Sunny | 8 mph ENE | 12% |
| Wednesday Night | 60°F | Partly Cloudy | 7 mph E | 7% |
| Thursday | 84°F | Slight Chance Rain Showers | 7 mph SE | 21% |
| Thursday Night | 63°F | Mostly Cloudy | 7 mph E | 11% |
| Friday | 86°F | Partly Sunny | 7 mph SE | 14% |
| Friday Night | 64°F | Mostly Cloudy | 7 mph ESE | 12% |
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 Sep 19, 2026.