Spartanburg weather in September

In September, Spartanburg sees average daytime highs of 82°F and overnight lows near 63°F, with 3.6 in of rain across 8.8 wet days and about 12.2 hours of daylight. It is the 4th-warmest and 7th-wettest month of the year here.

Highs ease over the month, from about 85°F in the first days to 78°F by the end. The sky is clear or mostly clear about 39% 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 Spartanburg's 3rd-clearest and 9th-windiest month. For the whole year in context, see Spartanburg's year-round climate.

Daytime high
82°
4th warmest
Overnight low
63°
9th coldest
Rainfall
3.6 in
8.8 wet days
Daylight
12 h 12 min
6:16 AM – 6:29 PM
Cloud cover
54%
3rd clearest
Wind
5 mph
9th windiest
Solar energy
4.58 kWh/m²
Travel score
6.3
out of 10

Spartanburg is city and county seat of Spartanburg County, South Carolina, United States.

Density
735/km²
people per km²
Founded
1831

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 78°F by the end.

A typical September day in Spartanburg reaches about 82°F in the afternoon and slips back to 63°F overnight — a 19°F spread between the day's warmth and the night's chill. On most days the high lands between 73°F and 90°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)
18668
28667
38567
48567
58567
68566
78566
88466
98465
108465
118365
128365
138364
148364
158264
168264
178263
188163
198162
208162
218062
228062
238061
247961
257960
267860
277860
287859
297759
307758

How September really feels in Spartanburg

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.

Spartanburg weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan52° / 33°4.09.719.92.7
Feb55° / 36°3.68.50.910.73.7
Mar63° / 42°4.4100.311.75.7
Apr72° / 51°3.78.7012.96.9
May80° / 59°3.19.7013.86.5
Jun87° / 67°3.611.7014.34.6
Jul90° / 71°3.712.9014.13.7
Aug87° / 70°3.811.6013.34.4
Sep82° / 63°3.68.8012.26.3
Oct72° / 51°3.26.9011.17.4
Nov62° / 41°3.67.5010.25.7
Dec54° / 35°4.08.90.59.73.4

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 39% 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 45%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15446
25446
35545
45545
55545
65545
75644
85644
95644
105644
115644
125644
135644
145644
155644
165545
175446
185446
195446
205347
215347
225347
235446
245545
255545
265644
275644
285743
295743
305743

Chance of precipitation in September

Any precipitation

Spartanburg gets around 3.6 in of rain over 8.8 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 29% and peaks near 31% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
131
231
330
430
530
630
729
829
928
1028
1128
1227
1327
1427
1528
1628
1728
1829
1929
2029
2129
2229
2329
2429
2528
2628
2727
2827
2927
3026

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 29% of days. Sticky, muggy-or-worse air turns up on roughly 38% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1512234119
2613244018
3713243917
4714243816
5815253715
6916253614
71017253513
81117253412
91218253411
101318253310
11141925329
12151925329
13161925318
14171925318
15181925307
16181926297
17191926287
18202027277
19212026267
20212027266
21232027256
22241927246
23251927236
24271927215
25291927205
26301926195
27321926185
28332026174
29352025164
30362024154

Wind in September

Winds average 5 mph in September.

Across September, daily wind ranges from about 4 mph on the calmest days to 5 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (mph)Feels
14calm
24calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
125calm
135calm
145calm
155calm
165calm
175calm
185calm
195calm
205calm
215calm
225calm
235calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm

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 6:04 AM to 6:26 AM, and sunset from 6:51 PM to 6:08 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.86:046:51
212.76:056:49
312.76:066:48
412.76:076:46
512.66:076:45
612.66:086:43
712.66:096:42
812.56:106:40
912.56:106:39
1012.46:116:37
1112.46:126:36
1212.46:136:35
1312.36:136:33
1412.36:146:32
1512.36:156:30
1612.26:166:29
1712.26:166:27
1812.16:176:26
1912.16:186:24
2012.16:196:23
2112.06:196:21
2212.06:206:20
2312.06:216:18
2411.96:226:17
2511.96:226:15
2611.86:236:14
2711.86:246:12
2811.86:256:11
2911.76:266:09
3011.76:266:08

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.58 kWh/m².

For context, solar energy here swings from a low near 2.3 kWh/m² to a high of 6.17 kWh/m² in June across the year — September's 4.58 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.0Bright
25.0Bright
35.0Bright
45.0Bright
54.9Bright
64.9Bright
74.9Bright
84.9Bright
94.8Bright
104.8Bright
114.8Bright
124.7Bright
134.7Bright
144.7Bright
154.6Bright
164.6Bright
174.5Bright
184.5Bright
194.5Bright
204.4Bright
214.4Bright
224.3Bright
234.3Bright
244.3Bright
254.3Bright
264.2Bright
274.2Bright
284.2Bright
294.1Bright
304.1Bright
Planning a trip in September

Is September a good time to visit Spartanburg?

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

6.3
Sightseeing
4th-best month of the year
6.9
Beach & pool
1st-best month of the year

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

What to pack for Spartanburg in September

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

In September, Spartanburg sees daytime highs around 82°F and nights near 63°F. Pack light clothes. Worth having: rain gear and sun protection. About 9 days see rain.

light clothesrain gearsun protection

UV index in Spartanburg 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 Spartanburg peaks around July 11 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 at about 3 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 11 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateJul 11UV 9Dec 20UV 3
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar6High
Apr7High
May8Very high
Jun9Very high
Jul9Very high
Aug8Very high
Sep7High
Oct5Moderate
Nov4Moderate
Dec2Moderate

Air quality in Spartanburg 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 Spartanburg is worst in July — around 19 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (December, 9 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1719 µg/m³Dec 239 µg/m³
PM2.5 (µg/m³)Level
Jan9Good
Feb11Good
Mar13Moderate
Apr12Moderate
May14Moderate
Jun17Moderate
Jul19Moderate
Aug17Moderate
Sep13Moderate
Oct10Good
Nov10Good
Dec9Good
Location & terrain

Where is Spartanburg?

Spartanburg sits at 34.9°N, 81.9°W, 807 ft above sea level, in United States. The nearest listed city is Greer, 17 mi away.

Topography around Spartanburg

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

Within 2 miles, the terrain around Spartanburg has only modest variations in elevation — a maximum elevation change of 256 ft around an average of 764 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 571 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 4,167 ft.

The land around Spartanburg is covered by trees (64%) and artificial surfaces (26%) within 2 miles, trees (71%) within 10 miles, and trees (82%) within 50 miles.

2 miles
256 ft
10 miles
571 ft
50 miles
4,167 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Greer 17 mi · Taylors 21 mi · Wade Hampton 23 mi · Simpsonville 24 mi · Mauldin 24 mi · Greenville 27 mi · Shelby 32 mi · Easley 39 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 Spartanburg (34.9496°, -81.9321°, elevation 807 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).