Newcastle, OK Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Newcastle, a city in Mcclain County, Oklahoma.
This Afternoon
99°F
Sunny
Sunny, with a high near 99. Heat index values as high as 101. South wind around 14 mph, with gusts as high as 21 mph.
7-day forecast for Newcastle
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 99°F | Sunny | 14 mph S | 0% |
| Tonight | 75°F | Partly Cloudy | 15 mph S | 10% |
| Sunday | 95°F | Chance Showers And Thunderstorms | 10 to 15 mph S | 62% |
| Sunday Night | 66°F | Showers And Thunderstorms Likely | 5 to 9 mph NNW | 62% |
| Monday | 86°F | Chance Rain Showers then Mostly Sunny | 8 to 12 mph N | 25% |
| Monday Night | 62°F | Mostly Clear | 9 mph NNE | 6% |
| Tuesday | 83°F | Mostly Sunny | 12 mph NE | 6% |
| Tuesday Night | 59°F | Partly Cloudy | 8 to 12 mph NE | 3% |
| Wednesday | 84°F | Mostly Sunny | 8 mph ENE | 10% |
| Wednesday Night | 61°F | Partly Cloudy | 7 mph E | 5% |
| Thursday | 88°F | Slight Chance Rain Showers | 6 mph SE | 15% |
| Thursday Night | 64°F | Chance Showers And Thunderstorms | 6 mph SE | 26% |
| Friday | 88°F | Chance Rain Showers | 3 to 7 mph SE | 26% |
| Friday Night | 67°F | Mostly Cloudy | 6 mph E | 8% |
Forecast source: National Weather Service (api.weather.gov) for Newcastle (35.242, -97.595). Updated through the day.
Growing snapshot for Newcastle
Last spring frost
Mar 31
First fall frost
Nov 5
Growing season
219 days
Hardiness zone
7b
More local growing data for Newcastle: nearby ZIP 73065 weather · frost dates · planting calendar · Oklahoma frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Norman 2Nw Mesonet, Ok (8.3 mi from Newcastle). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.