Duncan, OK Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Duncan, a city in Stephens County, Oklahoma.
This Afternoon
67°F
Mostly Sunny
Mostly sunny, with a high near 67. Northwest wind 14 to 18 mph, with gusts as high as 28 mph.
7-day forecast for Duncan
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 67°F | Mostly Sunny | 14 to 18 mph NW | 1% |
| Tonight | 46°F | Mostly Clear | 3 to 10 mph NW | 0% |
| Wednesday | 69°F | Sunny | 5 mph W | 0% |
| Wednesday Night | 49°F | Partly Cloudy | 6 mph SSE | 0% |
| Thursday | 68°F | Mostly Sunny | 7 to 15 mph WSW | 12% |
| Thursday Night | 44°F | Mostly Clear | 6 to 14 mph N | 12% |
| Friday | 66°F | Sunny | 9 mph N | 0% |
| Friday Night | 42°F | Mostly Clear | 6 mph NNE | 0% |
| Saturday | 66°F | Mostly Sunny | 0 to 5 mph N | 2% |
| Saturday Night | 42°F | Mostly Clear | 2 mph N | 3% |
| Sunday | 69°F | Sunny | 1 to 6 mph WNW | 0% |
| Sunday Night | 42°F | Clear | 1 mph S | 1% |
| Monday | 70°F | Sunny | 2 to 10 mph S | 1% |
| Monday Night | 46°F | Mostly Clear | 7 mph S | 1% |
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 Nov 3, 2026.