Bartlesville weather in September

In September, Bartlesville sees average daytime highs of 83°F and overnight lows near 63°F, with 3.8 in of rain across 7.8 wet days and about 12.2 hours of daylight. It is the 4th-warmest and 4th-wettest month of the year here.

Highs ease over the month, from about 88°F in the first days to 79°F by the end. The sky is clear or mostly clear about 53% of the time in September, and the air most often feels dry.

Daylight stretches from about 12 h 48 min at the start of September to 11 h 42 min by month's end. Set against the rest of the year, September is Bartlesville's 1st-clearest and 10th-windiest month. For the whole year in context, see Bartlesville's year-round climate.

Daytime high
83°
4th warmest
Overnight low
63°
9th coldest
Rainfall
3.8 in
7.8 wet days
Daylight
12 h 12 min
6:11 AM – 6:25 PM
Cloud cover
42%
1st clearest
Wind
7 mph
10th windiest
Solar energy
4.98 kWh/m²
Travel score
6.4
out of 10

Bartlesville is city in Oklahoma, United States.

Density
620/km²
people per km²
Founded
1897

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 88°F in the first days to 79°F by the end.

A typical September day in Bartlesville reaches about 83°F in the afternoon and slips back to 63°F overnight — a 20°F spread between the day's warmth and the night's chill. On most days the high lands between 73°F and 92°F. Set against its neighbours, September runs about 8°F cooler than August and about 12°F warmer than October.

40°60°80°100°151015202530
Avg high (°F)Avg low (°F)
18869
28868
38868
48767
58767
68667
78666
88566
98565
108565
118465
128464
138364
148364
158363
168263
178262
188262
198162
208161
218160
228060
238060
248059
258059
267958
277958
287957
297857
307856

How September really feels in Bartlesville

Once humidity and wind are folded in, September averages 1 day that feel above 90°F and 0 that feel at or below 32°F — the comfort signal a plain temperature reading hides.

Days feeling ≥ 90°F
1
heat index over the day's high
Days feeling ≤ 32°F
0
wind chill below the day's low

The story in September is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Bartlesville weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan46° / 28°1.75.81.69.81.4
Feb51° / 31°2.061.510.62.8
Mar61° / 40°3.59.40.911.75.1
Apr70° / 49°5.011012.96.4
May78° / 59°6.212013.96.4
Jun87° / 69°4.810.4014.54.9
Jul92° / 73°3.08.1014.33.7
Aug91° / 71°2.97013.44.1
Sep83° / 63°3.87.8012.26.4
Oct71° / 51°3.58011.17.3
Nov59° / 39°2.56.90.5105.0
Dec48° / 31°2.15.81.59.52.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 53% of the time in September, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 13% of September, with mostly cloudy or overcast conditions the remaining 34%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
16931
26832
36832
46733
56634
66535
76535
86436
96337
106337
116238
126238
136238
146238
156238
166238
176337
186337
196535
206535
216733
226832
237030
247129
257129
267228
277228
287327
297228
307228

Chance of precipitation in September

Any precipitation

Bartlesville gets around 3.8 in of rain over 7.8 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 26% and peaks near 29% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
125
225
326
426
527
627
727
828
928
1028
1129
1229
1329
1429
1529
1628
1728
1828
1927
2027
2126
2225
2324
2423
2523
2622
2722
2821
2921
3021

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

Most of September feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, September lands in the dry band about 29% of days. Sticky, muggy-or-worse air turns up on roughly 34% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1711264115
2812264014
3913263913
41113253813
51214253712
61315253611
71515243510
81616243410
9181624339
10191723339
11201723328
12211722318
13231722317
14241722307
15261722296
16271722286
17291722275
18311722255
19321722245
20341722225
21361721215
22391721194
23411620184
24431620174
25451619154
26481619144
27501618133
28521617123
29531616123
30541616113

Wind in September

Winds average 7 mph in September.

Across September, daily wind ranges from about 6 mph on the calmest days to 7 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (mph)Feels
16calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 48 min at the start of September to 11 h 42 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 66 minutes over September. Sunrise moves from 5:59 AM to 6:23 AM, and sunset from 6:48 PM to 6:03 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.85:596:48
212.86:006:47
312.76:016:45
412.76:016:44
512.76:026:42
612.66:036:41
712.66:046:39
812.56:056:38
912.56:066:36
1012.56:066:35
1112.46:076:33
1212.46:086:31
1312.46:096:30
1412.36:106:28
1512.36:106:27
1612.26:116:25
1712.26:126:24
1812.26:136:22
1912.16:146:20
2012.16:156:19
2112.06:156:17
2212.06:166:16
2311.96:176:14
2411.96:186:13
2511.96:196:11
2611.86:206:09
2711.86:216:08
2811.76:216:06
2911.76:226:05
3011.76:236:03

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.98 kWh/m².

For context, solar energy here swings from a low near 2.27 kWh/m² to a high of 6.77 kWh/m² in July across the year — September's 4.98 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.6Bright
25.5Bright
35.5Bright
45.4Bright
55.4Bright
65.3Bright
75.3Bright
85.2Bright
95.2Bright
105.1Bright
115.1Bright
125.0Bright
135.0Bright
145.0Bright
154.9Bright
164.9Bright
174.8Bright
184.8Bright
194.8Bright
204.8Bright
214.8Bright
224.8Bright
234.7Bright
244.7Bright
254.7Bright
264.7Bright
274.7Bright
284.6Bright
294.6Bright
304.6Bright
Planning a trip in September

Is September a good time to visit Bartlesville?

Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

6.4
Sightseeing
2nd-best month of the year
7.2
Beach & pool
1st-best month of the year

September is a reasonable time to visit Bartlesville for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Bartlesville in September

From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In September, Bartlesville sees daytime highs around 83°F and nights near 63°F. Pack light clothes. Worth having: sun protection. About 8 days see rain.

light clothessun protection

UV index in Bartlesville in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Bartlesville peaks around June 23 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 at about 2 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 10 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateJun 23UV 10Dec 22UV 2
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar5High
Apr8Very high
May8Very high
Jun10Very high
Jul10Very high
Aug9Very high
Sep7Very high
Oct5High
Nov4Moderate
Dec2Moderate

Air quality in Bartlesville in September

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where September falls, not just the annual average.

Air quality in Bartlesville is worst in April — around 26 µg/m³ PM2.5 (moderate), about 5.3× the cleanest month (November, 5 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateModerateGoodApr 1325 µg/m³Nov 145 µg/m³
PM2.5 (µg/m³)Level
Jan6Good
Feb8Good
Mar20Moderate
Apr26Moderate
May11Good
Jun13Moderate
Jul15Moderate
Aug14Moderate
Sep10Good
Oct5Good
Nov5Good
Dec6Good
Location & terrain

Where is Bartlesville?

Bartlesville sits at 36.7°N, 96.0°W, 702 ft above sea level, in United States. The nearest listed city is Owasso, 34 mi away.

Topography around Bartlesville

How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Bartlesville.

Within 2 miles, the terrain around Bartlesville has only modest variations in elevation — a maximum elevation change of 223 ft around an average of 686 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 433 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 922 ft.

The land around Bartlesville is covered by trees (42%) and grassland (27%) within 2 miles, grassland (58%) and trees (34%) within 10 miles, and grassland (60%) and trees (29%) within 50 miles.

2 miles
223 ft
10 miles
433 ft
50 miles
922 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Owasso 34 mi · Claremore 36 mi · Tulsa 41 mi · Sand Springs 43 mi · Broken Arrow 49 mi · Jenks 50 mi · Sapulpa 52 mi · Bixby 56 mi

United States travel facts

Power plugs
Type A / B
120 V · 60 Hz
Prices
≈ 100% of US
price level, 2025
GDP per capita
$90,027
2025
Happiness
6.8 / 10
World Happiness, 2025
Safe drinking water
98%
of population, 2024
Homicide rate
5.8
per 100k, 2023
Road deaths
12.7
per 100k/yr, 2019
Income group
High
World Bank
Religion
Protestant 47%unaffiliated 23%Roman Catholic 21%Jewish 2%

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Bartlesville (36.7473°, -95.9808°, elevation 702 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).