Fayetteville weather in September

In September, Fayetteville sees average daytime highs of 81°F and overnight lows near 61°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 6th-wettest month of the year here.

Highs ease over the month, from about 85°F in the first days to 77°F by the end. The sky is clear or mostly clear about 49% 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 Fayetteville's 1st-clearest and 10th-windiest month. For the whole year in context, see Fayetteville's year-round climate.

Daytime high
81°
4th warmest
Overnight low
61°
9th coldest
Rainfall
3.8 in
7.8 wet days
Daylight
12 h 12 min
6:04 AM – 6:18 PM
Cloud cover
43%
1st clearest
Wind
6 mph
10th windiest
Solar energy
4.94 kWh/m²
Travel score
6.8
out of 10

Fayetteville is county seat of Washington County, Arkansas, United States.

Density
579/km²
people per km²
Founded
1828

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 85°F in the first days to 77°F by the end.

A typical September day in Fayetteville reaches about 81°F in the afternoon and slips back to 61°F overnight — a 19°F spread between the day's warmth and the night's chill. On most days the high lands between 71°F and 89°F. Set against its neighbours, September runs about 7°F cooler than August and about 11°F warmer than October.

40°60°80°151015202530
Avg high (°F)Avg low (°F)
18666
28566
38566
48565
58465
68465
78365
88364
98364
108264
118263
128263
138162
148162
158062
168061
178061
188060
197960
207960
217959
227859
237858
247858
257758
267757
277757
287656
297656
307656

How September really feels in Fayetteville

Once humidity and wind are folded in, September averages 0 days 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
0
heat index over the day's high
Days feeling ≤ 32°F
0
wind chill below the day's low

September sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Fayetteville weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 6th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan46° / 29°2.77.61.79.81.4
Feb51° / 33°2.77.61.510.62.6
Mar60° / 40°4.410.6111.74.7
Apr68° / 49°5.511.1012.96.1
May75° / 58°5.612.9013.96.4
Jun83° / 67°4.110.9014.45.6
Jul88° / 70°3.310.4014.24.5
Aug87° / 69°3.09.6013.44.8
Sep81° / 61°3.87.8012.26.8
Oct70° / 50°4.19011.16.9
Nov58° / 40°3.77.90.410.14.5
Dec48° / 32°3.07.61.49.62.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 49% of the time in September, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 16% of September, with mostly cloudy or overcast conditions the remaining 35%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
16832
26832
36832
46733
56733
66634
76535
86436
96436
106436
116337
126238
136238
146238
156238
166139
176238
186238
196337
206337
216436
226535
236634
246832
256931
266931
276931
287030
297030
307030

Chance of precipitation in September

Any precipitation

Fayetteville 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 30% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%151015202530
Rain chance (%)
130
229
329
429
529
629
729
828
928
1028
1128
1228
1328
1428
1528
1628
1727
1827
1927
2026
2126
2225
2324
2423
2523
2622
2722
2822
2922
3022

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 31% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1913264012
21014263911
31115263810
4131526379
5141625369
6151725358
7161725347
8181824347
9191824336
10201824325
11211824325
12221924314
13241923304
14251923294
15261923283
16271923273
17291923263
18301923252
19321923242
20341822232
21361822222
22381821212
23401820201
24431820191
25451819171
26471818161
27491818151
28501717151
29521716141
30531716131

Wind in September

Winds average 6 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
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
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 5:52 AM to 6:16 AM, and sunset from 6:40 PM to 5:56 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.85:526:40
212.85:536:39
312.75:546:37
412.75:556:36
512.75:556:34
612.65:566:33
712.65:576:31
812.55:586:30
912.55:596:28
1012.55:596:27
1112.46:006:25
1212.46:016:24
1312.36:026:22
1412.36:036:21
1512.36:036:19
1612.26:046:18
1712.26:056:16
1812.16:066:15
1912.16:076:13
2012.16:076:12
2112.06:086:10
2212.06:096:08
2312.06:106:07
2411.96:116:05
2511.96:116:04
2611.86:126:02
2711.86:136:01
2811.86:145:59
2911.76:155:58
3011.76:165:56

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.94 kWh/m².

For context, solar energy here swings from a low near 2.24 kWh/m² to a high of 6.55 kWh/m² in July across the year — September's 4.94 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.5Bright
25.4Bright
35.4Bright
45.3Bright
55.3Bright
65.3Bright
75.2Bright
85.2Bright
95.1Bright
105.1Bright
115.0Bright
125.0Bright
135.0Bright
144.9Bright
154.9Bright
164.8Bright
174.8Bright
184.8Bright
194.8Bright
204.8Bright
214.7Bright
224.7Bright
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 Fayetteville?

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

6.8
Sightseeing
2nd-best month of the year
7.0
Beach & pool
1st-best month of the year

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

What to pack for Fayetteville in September

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

In September, Fayetteville sees daytime highs around 81°F and nights near 61°F. Pack light clothes. Worth having: sun protection. About 8 days see rain.

light clothessun protection

UV index in Fayetteville in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 8 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Fayetteville peaks around July 12 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 at about 3 (moderate).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highVery highHighModerateJul 12UV 10Dec 22UV 3
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar6High
Apr8Very high
May8Very high
Jun10Very high
Jul10Extreme
Aug9Very high
Sep8Very high
Oct5High
Nov4Moderate
Dec3Moderate

Air quality in Fayetteville 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 Fayetteville is worst in July — around 19 µg/m³ PM2.5 (moderate), about 3.0× the cleanest month (November, 6 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodGoodModerateGoodJul 1518 µg/m³Nov 236 µg/m³
PM2.5 (µg/m³)Level
Jan7Good
Feb9Good
Mar12Moderate
Apr11Good
May13Moderate
Jun16Moderate
Jul19Moderate
Aug15Moderate
Sep11Good
Oct7Good
Nov6Good
Dec6Good
Location & terrain

Where is Fayetteville?

Fayetteville sits at 36.1°N, 94.2°W, 1,401 ft above sea level, in United States. The nearest listed city is Springdale, 8.7 mi away.

Topography around Fayetteville

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

Within 2 miles, the terrain around Fayetteville has only modest variations in elevation — a maximum elevation change of 564 ft around an average of 1,355 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 1,135 ft; within 50 miles, large variations in elevation — a maximum elevation change of 2,218 ft.

The land around Fayetteville is covered by trees (58%) and artificial surfaces (29%) within 2 miles, trees (52%) and grassland (35%) within 10 miles, and trees (67%) and grassland (28%) within 50 miles.

2 miles
564 ft
10 miles
1,135 ft
50 miles
2,218 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Springdale 8.7 mi · Rogers 19 mi · Bentonville 22 mi · Siloam Springs 23 mi · Bella Vista 30 mi · Van Buren 45 mi · Tahlequah 47 mi · Fort Smith 48 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 Fayetteville (36.0626°, -94.1574°, elevation 1,401 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).