Washington County climate

Washington County Weather in September

NOAA 1991-2020 normals for Bartlesville F P Fld, 12.4 km from Washington County

Average highs run from 89°F on September 1 to 79°F on September 30, and lows from 63°F to 52°F. Normal precipitation for the month is 3.43 in over about 8 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 Washington County, in °F, with the record for each date.20406080100120151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

September at a glance

Average high
84°F
Average low
58°F
Precipitation
3.43 in
Record high
110°FSep 4, 2012
Record low
37°FSep 27, 2018
Chance of a freeze
4%
Days of 90°F or more
9.3
Daylight
12 h 57 min to 11 h 50 min
Cloud cover
44%
Humidity
66%
Dew point
59°F
Wind
9.4 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 189°F63°F107°F 201148°F 200926%0%
Sep 289°F63°F105°F 201153°F 200726%0%
Sep 389°F63°F103°F 201253°F 201626%0%
Sep 488°F62°F110°F 201247°F 201026%0%
Sep 588°F62°F106°F 201249°F 201026%0%
Sep 688°F62°F103°F 201242°F 201126%0%
Sep 787°F61°F100°F 201244°F 201126%0%
Sep 887°F61°F100°F 201245°F 202426%0%
Sep 987°F60°F99°F 201346°F 202426%0%
Sep 1086°F60°F97°F 201343°F 202426%0%
Sep 1186°F60°F95°F 201345°F 201226%0%
Sep 1286°F59°F97°F 202144°F 202227%0%
Sep 1385°F59°F97°F 201146°F 200627%0%
Sep 1485°F59°F99°F 201146°F 200627%0%
Sep 1585°F58°F100°F 201147°F 201427%0%
Sep 1684°F58°F95°F 201953°F 200727%0%
Sep 1784°F57°F97°F 200653°F 202327%0%
Sep 1883°F57°F97°F 202248°F 200627%0%
Sep 1983°F56°F101°F 202444°F 200627%0%
Sep 2083°F56°F101°F 202244°F 200627%0%
Sep 2182°F56°F100°F 202247°F 200627%0%
Sep 2282°F55°F102°F 202247°F 201227%0%
Sep 2382°F55°F93°F 201642°F 202127%0%
Sep 2481°F54°F93°F 202246°F 200927%0%
Sep 2581°F54°F95°F 202243°F 200627%0%
Sep 2680°F53°F97°F 201242°F 200626%0%
Sep 2780°F53°F94°F 202137°F 201826%0%
Sep 2880°F53°F95°F 202138°F 201826%0%
Sep 2979°F52°F94°F 202340°F 200626%0%
Sep 3079°F52°F93°F 202339°F 202026%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Washington County, in percent, and of at least 0.1 inch of snowfall.01020301102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (CDT).

September 1
sunrise 6:55 AM, sunset 7:52 PM
September 30
sunrise 7:18 AM, sunset 7:08 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USW00003959 (Bartlesville F P Fld), public domain. Records: NOAA GHCN-Daily, station USC00340546, 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 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.