Newcastle, OK Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Newcastle, a city in Mcclain County, Oklahoma.
Tonight
45°F
Mostly Clear
Mostly clear, with a low around 45. Northwest wind around 7 mph.
7-day forecast for Newcastle
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 45°F | Mostly Clear | 7 mph NW | 0% |
| Wednesday | 67°F | Sunny | 2 to 6 mph WNW | 0% |
| Wednesday Night | 47°F | Mostly Clear | 5 mph S | 0% |
| Thursday | 62°F | Rain Showers Likely | 3 to 13 mph SE | 72% |
| Thursday Night | 42°F | Slight Chance Rain Showers then Mostly Clear | 5 to 9 mph N | 16% |
| Friday | 61°F | Sunny | 8 mph N | 0% |
| Friday Night | 41°F | Partly Cloudy | 1 to 5 mph NNE | 0% |
| Saturday | 62°F | Mostly Sunny | 0 to 5 mph NNW | 1% |
| Saturday Night | 41°F | Mostly Clear | 2 mph WNW | 3% |
| Sunday | 67°F | Sunny | 5 mph W | 2% |
| Sunday Night | 41°F | Clear | 5 mph SSW | 1% |
| Monday | 69°F | Sunny | 5 to 12 mph SSW | 1% |
| Monday Night | 46°F | Mostly Clear | 7 mph SSW | 1% |
| Tuesday | 71°F | Sunny | 6 to 10 mph S | 0% |
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 Nov 4, 2026.