Carrboro weather in September

In September, Carrboro sees average daytime highs of 81°F and overnight lows near 64°F, with 4.4 in of rain across 9.4 wet days and about 12.2 hours of daylight. It is the 4th-warmest and 1st-wettest month of the year here.

Highs ease over the month, from about 84°F in the first days to 77°F by the end. The sky is clear or mostly clear about 35% of the time in September, and the air most often feels muggy.

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 Carrboro's 6th-clearest and 9th-windiest month. For the whole year in context, see Carrboro's year-round climate.

Daytime high
81°
4th warmest
Overnight low
64°
9th coldest
Rainfall
4.4 in
9.4 wet days
Daylight
12 h 12 min
6:04 AM – 6:17 PM
Cloud cover
56%
6th clearest
Wind
6 mph
9th windiest
Solar energy
4.42 kWh/m²
Travel score
6.4
out of 10

Carrboro is town in North Carolina, United States.

Density
1,247/km²
people per km²
Founded
1882

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 84°F in the first days to 77°F by the end.

A typical September day in Carrboro reaches about 81°F in the afternoon and slips back to 64°F overnight — a 17°F spread between the day's warmth and the night's chill. On most days the high lands between 72°F and 89°F. Set against its neighbours, September runs about 6°F cooler than August and about 10°F warmer than October.

40°60°80°151015202530
Avg high (°F)Avg low (°F)
18568
28468
38467
48467
58467
68367
78366
88366
98366
108266
118265
128265
138265
148164
158164
168064
178064
188063
198063
207963
217962
227962
237862
247861
257861
267761
277760
287760
297660
307659

How September really feels in Carrboro

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.

Carrboro weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan50° / 33°3.69.41.49.82.4
Feb54° / 35°3.28.91.310.63.3
Mar62° / 42°4.310.50.511.75.2
Apr71° / 51°3.59.3012.96.7
May78° / 60°3.410.6013.96.6
Jun85° / 68°3.912014.45.0
Jul88° / 71°4.314.9014.23.9
Aug86° / 70°3.911.6013.44.7
Sep81° / 64°4.49.4012.26.4
Oct71° / 53°3.17.5011.17.1
Nov61° / 42°3.37.70.110.15.5
Dec53° / 36°3.59.20.69.63.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 35% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 17% of September, with mostly cloudy or overcast conditions the remaining 48%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15248
25347
35347
45347
55347
65446
75446
85347
95446
105446
115446
125545
135446
145446
155347
165248
175248
185149
195149
205050
215050
224951
234951
245050
255050
265050
275149
285149
295149
305149

Chance of precipitation in September

Any precipitation

Carrboro gets around 4.4 in of rain over 9.4 wet days in September, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 31% and peaks near 33% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
133
232
332
432
531
631
730
830
929
1029
1129
1229
1329
1429
1529
1629
1730
1830
1931
2032
2132
2232
2332
2432
2532
2631
2730
2830
2929
3029

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the muggy band about 30% of days. Sticky, muggy-or-worse air turns up on roughly 42% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1411223825
2411223824
3512233623
4613233622
5613243521
6714243420
7815253319
8915253318
91016253217
101116253216
111216253215
121317253114
131417253113
141517243112
151618243112
161618243111
171719243110
18181923309
19191923309
20202023298
21212023298
22222022287
23232122277
24252122266
25262122256
26272222246
27292222225
28312221215
29322221205
30342221185

Wind in September

Winds average 6 mph in September.

Across September, daily wind ranges from about 5 mph on the calmest days to 6 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (mph)Feels
15calm
25calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm

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 6:15 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
212.85:536:38
312.75:546:37
412.75:546:36
512.65:556:34
612.65:566:33
712.65:576:31
812.55:586:30
912.55:586:28
1012.55:596:27
1112.46:006:25
1212.46:016:23
1312.36:026:22
1412.36:026:20
1512.36:036:19
1612.26:046:17
1712.26:056:16
1812.16:056:14
1912.16:066:13
2012.16:076:11
2112.06:086:10
2212.06:096:08
2312.06:106:07
2411.96:106:05
2511.96:116:04
2611.86:126:02
2711.86:136:00
2811.86:145:59
2911.76:145:57
3011.76:155:56

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.42 kWh/m².

For context, solar energy here swings from a low near 2.24 kWh/m² to a high of 6.15 kWh/m² in June across the year — September's 4.42 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
15.0Bright
24.9Bright
34.9Bright
44.9Bright
54.8Bright
64.8Bright
74.8Bright
84.7Bright
94.7Bright
104.7Bright
114.6Bright
124.6Bright
134.5Bright
144.5Bright
154.4Bright
164.4Bright
174.4Bright
184.3Bright
194.3Bright
204.2Bright
214.2Bright
224.2Bright
234.1Bright
244.1Bright
254.1Bright
264.1Bright
274.0Bright
284.0Bright
294.0Moderate
304.0Moderate
Planning a trip in September

Is September a good time to visit Carrboro?

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

6.4
Sightseeing
4th-best month of the year
6.7
Beach & pool
1st-best month of the year

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

What to pack for Carrboro in September

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

In September, Carrboro sees daytime highs around 81°F and nights near 64°F. Pack light clothes. Worth having: rain gear. About 9 days see rain.

light clothesrain gear

UV index in Carrboro 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 Carrboro peaks around July 14 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 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 highHighModerateJul 14UV 9Dec 20UV 2
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar6High
Apr7High
May8Very high
Jun9Very high
Jul10Very high
Aug8Very high
Sep7High
Oct5Moderate
Nov3Moderate
Dec2Moderate

Air quality in Carrboro 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 Carrboro is worst in July — around 18 µg/m³ PM2.5 (moderate), about 2.3× the cleanest month (November, 8 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1718 µg/m³Nov 238 µg/m³
PM2.5 (µg/m³)Level
Jan8Good
Feb10Good
Mar12Moderate
Apr12Moderate
May13Moderate
Jun16Moderate
Jul18Moderate
Aug16Moderate
Sep12Good
Oct9Good
Nov8Good
Dec8Good
Location & terrain

Where is Carrboro?

Carrboro sits at 35.9°N, 79.1°W, 463 ft above sea level, in United States. The nearest listed city is Chapel Hill, 1.2 mi away.

Topography around Carrboro

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

Within 2 miles, the terrain around Carrboro has only modest variations in elevation — a maximum elevation change of 299 ft around an average of 463 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 696 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 1,227 ft.

The land around Carrboro is covered by trees (79%) within 2 miles, trees (84%) within 10 miles, and trees (79%) within 50 miles.

2 miles
299 ft
10 miles
696 ft
50 miles
1,227 ft
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Chapel Hill 1.2 mi · Durham 11 mi · Morrisville 15 mi · Apex 17 mi · Cary 19 mi · Holly Springs 22 mi · Burlington 24 mi · West Raleigh 25 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 Carrboro (35.9101°, -79.0753°, elevation 463 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).