Fort Supply, OK Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Fort Supply, a town in Ellis County, Oklahoma.
This Afternoon
99°F
Sunny
Sunny, with a high near 99. Heat index values as high as 99. South southwest wind around 16 mph, with gusts as high as 24 mph.
7-day forecast for Fort Supply
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 99°F | Sunny | 16 mph SSW | 0% |
| Tonight | 76°F | Mostly Clear | 16 mph S | 2% |
| Saturday | 100°F | Mostly Sunny then Chance Showers And Thunderstorms | 16 mph SSW | 26% |
| Saturday Night | 69°F | Chance Showers And Thunderstorms | 8 to 15 mph SSW | 42% |
| Sunday | 90°F | Chance Rain Showers then Slight Chance Showers And Thunderstorms | 9 mph NNE | 42% |
| Sunday Night | 62°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 6 to 13 mph NNE | 25% |
| Monday | 83°F | Slight Chance Rain Showers then Partly Sunny | 9 mph NNE | 21% |
| Monday Night | 60°F | Partly Cloudy | 6 to 9 mph ENE | 10% |
| Tuesday | 79°F | Partly Sunny | 8 mph E | 14% |
| Tuesday Night | 59°F | Partly Cloudy then Slight Chance Rain Showers | 9 mph ESE | 19% |
| Wednesday | 82°F | Chance Rain Showers | 8 mph SE | 28% |
| Wednesday Night | 63°F | Chance Rain Showers | 6 to 9 mph SE | 43% |
| Thursday | 83°F | Chance Rain Showers | 5 to 8 mph SSE | 46% |
| Thursday Night | 63°F | Chance Rain Showers | 7 mph SE | 43% |
Forecast source: National Weather Service (api.weather.gov) for Fort Supply (36.572, -99.574). Updated through the day.
Growing snapshot for Fort Supply
Last spring frost
Apr 21
First fall frost
Oct 19
Growing season
179 days
Hardiness zone
7a
More local growing data for Fort Supply: nearby ZIP 73841 weather · frost dates · planting calendar · Oklahoma frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Ft Supply 3Se, Ok (4.7 mi from Fort Supply). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 18, 2026.