Duncan, OK Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Duncan, a city in Stephens County, Oklahoma.
Today
104°F
Sunny
Sunny, with a high near 104. Heat index values as high as 103. South wind around 10 mph.
7-day forecast for Duncan
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 104°F | Sunny | 10 mph S | 1% |
| Tonight | 76°F | Mostly Clear | 7 to 12 mph SSE | 2% |
| Wednesday | 103°F | Sunny | 7 to 13 mph SSW | 2% |
| Wednesday Night | 76°F | Mostly Clear | 8 to 13 mph SSE | 1% |
| Thursday | 102°F | Mostly Sunny | 7 to 12 mph SSW | 9% |
| Thursday Night | 75°F | Mostly Clear | 8 to 12 mph SSE | 11% |
| Friday | 100°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 7 to 12 mph S | 24% |
| Friday Night | 73°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 8 to 13 mph SSE | 24% |
| Saturday | 100°F | Sunny | 7 to 13 mph S | 8% |
| Saturday Night | 74°F | Mostly Clear | 9 to 14 mph S | 6% |
| Sunday | 100°F | Sunny | 8 to 15 mph S | 2% |
| Sunday Night | 74°F | Mostly Clear | 12 to 15 mph SSE | 1% |
| Monday | 100°F | Sunny | 10 to 16 mph S | 2% |
| Monday Night | 75°F | Mostly Clear | 12 to 16 mph SSE | 2% |
Forecast source: National Weather Service (api.weather.gov) for Duncan (34.482, -97.961). Updated through the day.
Growing snapshot for Duncan
Last spring frost
Mar 25
First fall frost
Nov 7
Growing season
225 days
Hardiness zone
8a
More local growing data for Duncan: nearby ZIP 73533 weather · frost dates · planting calendar · Oklahoma frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Duncan, Ok (5.3 mi from Duncan). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.