Duncan climate

Duncan Weather in September

NOAA 1991-2020 normals for Duncan, 3.3 km from Duncan

Average highs run from 94°F on September 1 to 87°F on September 30, and lows from 62°F to 50°F. Normal precipitation for the month is 1.21 in over about 5 wet days.

September day by day

The normal high and low for each date, and the record, in °F.

Normal daily high and low temperature at Duncan, in °F, with the record for each date.406080100120151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

September at a glance

Average high
91°F
Average low
56°F
Precipitation
1.21 in
Record high
107°FSep 7, 2020
Record low
47°FSep 24, 2017
Chance of a freeze
0%
Days of 90°F or more
20.0
Daylight
12 h 50 min to 11 h 52 min
Cloud cover
35%
Humidity
45%
Dew point
47°F
Wind
8.3 mph

Every day of the month

A wet day has at least 0.01 inch of precipitation; snow means at least 0.1 inch of snowfall.

DateNormal highNormal lowRecord highRecord lowChance wetChance of snow
Sep 194°F62°F104°F 201160°F 200120%0%
Sep 294°F61°F103°F 201164°F 201020%0%
Sep 394°F61°F105°F 201962°F 200019%0%
Sep 494°F61°F106°F 202061°F 199919%0%
Sep 593°F61°F104°F 201660°F 201619%0%
Sep 693°F60°F104°F 202357°F 200419%0%
Sep 793°F60°F107°F 202065°F 201619%0%
Sep 893°F60°F105°F 202358°F 200118%0%
Sep 993°F59°F105°F 202356°F 200118%0%
Sep 1092°F59°F105°F 202357°F 201018%0%
Sep 1192°F59°F102°F 202350°F 201017%0%
Sep 1292°F58°F103°F 200457°F 202017%0%
Sep 1392°F58°F104°F 201758°F 200517%0%
Sep 1491°F57°F102°F 201854°F 200516%0%
Sep 1591°F57°F101°F 201851°F 200516%0%
Sep 1691°F57°F100°F 200353°F 201216%0%
Sep 1791°F56°F103°F 201853°F 200615%0%
Sep 1890°F56°F102°F 201853°F 200615%0%
Sep 1990°F55°F99°F 199854°F 200614%0%
Sep 2090°F55°F102°F 200556°F 200214%0%
Sep 2189°F54°F99°F 200556°F 200414%0%
Sep 2289°F54°F99°F 200148°F 200413%0%
Sep 2389°F53°F101°F 200550°F 200413%0%
Sep 2488°F53°F100°F 199847°F 201712%0%
Sep 2588°F53°F101°F 202049°F 201712%0%
Sep 2688°F52°F103°F 200549°F 201712%0%
Sep 2788°F52°F103°F 202454°F 199812%0%
Sep 2887°F51°F103°F 202449°F 201311%0%
Sep 2987°F51°F99°F 199852°F 200611%0%
Sep 3087°F50°F101°F 200350°F 201411%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Duncan, in percent, and of at least 0.1 inch of snowfall.051015201102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (MST).

September 1
sunrise 5:51 AM, sunset 6:41 PM
September 30
sunrise 6:10 AM, sunset 6:02 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00022754 (Duncan), public domain. Records: NOAA GHCN-Daily, station USW00093084, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-25. Sun and moon: computed with the NOAA solar equations and Meeus.