Harman US

Newcastle, OK Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Newcastle, a city in Mcclain County, Oklahoma.

Overnight
73°F
Partly Cloudy
Partly cloudy, with a low around 73. South wind around 10 mph.

7-day forecast for Newcastle

WhenTempForecastWindPrecip
Overnight 73°F Partly Cloudy 10 mph S 0%
Saturday 98°F Sunny 12 to 15 mph S 1%
Saturday Night 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 85°F Chance Showers And Thunderstorms then Mostly Sunny 7 to 12 mph NNE 33%
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 8 to 13 mph NE 21%
Tuesday Night 58°F Partly Cloudy 7 to 10 mph NE 6%
Wednesday 82°F Mostly Sunny 8 mph ENE 12%
Wednesday Night 60°F Partly Cloudy 7 mph E 7%
Thursday 85°F Slight Chance Rain Showers 7 mph SE 20%
Thursday Night 63°F Mostly Cloudy 7 mph E 11%
Friday 86°F Partly Sunny 7 mph SE 14%

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

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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.