Harman US

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

WhenTempForecastWindPrecip
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

All Oklahoma locations ›

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.