Clarksburg weather in September

In September, Clarksburg sees average daytime highs of 75°F and overnight lows near 57°F, with 4.1 in of rain across 10.7 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 9th-wettest month of the year here.

Highs ease over the month, from about 79°F in the first days to 71°F by the end. The sky is clear or mostly clear about 34% of the time in September, and the air most often feels dry.

Daylight stretches from about 12 h 54 min at the start of September to 11 h 36 min by month's end. Set against the rest of the year, September is Clarksburg's 1st-clearest and 10th-windiest month. For the whole year in context, see Clarksburg's year-round climate.

Daytime high
75°
4th warmest
Overnight low
57°
9th coldest
Rainfall
4.1 in
10.7 wet days
Daylight
12 h 18 min
6:08 AM – 6:23 PM
Cloud cover
55%
1st clearest
Wind
5 mph
10th windiest
Solar energy
4.33 kWh/m²
Travel score
6.8
out of 10

Clarksburg is city in West Virginia, United States.

Density
640/km²
people per km²
Founded
1785

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 79°F in the first days to 71°F by the end.

A typical September day in Clarksburg reaches about 75°F in the afternoon and slips back to 57°F overnight — a 18°F spread between the day's warmth and the night's chill. On most days the high lands between 66°F and 84°F. Set against its neighbours, September runs about 5°F cooler than August and about 11°F warmer than October.

40°60°80°151015202530
Avg high (°F)Avg low (°F)
17961
27961
37961
47860
57860
67860
77860
87759
97759
107759
117658
127658
137658
147657
157557
167557
177556
187456
197456
207455
217355
227355
237354
247254
257254
267253
277153
287153
297152
307052

How September really feels in Clarksburg

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.

Clarksburg weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan40° / 26°4.113.679.60.0
Feb43° / 28°3.912.35.610.50.5
Mar53° / 35°4.814.53.811.72.6
Apr64° / 45°4.814.40.9135.0
May71° / 53°5.615.5014.15.7
Jun78° / 61°5.314.5014.76.0
Jul81° / 65°5.615.9014.55.7
Aug80° / 63°4.212.1013.56.2
Sep75° / 57°4.110.7012.36.8
Oct64° / 46°3.710.50.2115.7
Nov53° / 37°3.710.71.79.83.0
Dec44° / 30°4.212.94.89.30.7

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 34% of the time in September, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 20% of September, with mostly cloudy or overcast conditions the remaining 46%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15941
25941
35941
45842
55842
65842
75842
85842
95743
105743
115743
125644
135545
145446
155446
165347
175248
185248
195149
205149
215050
225149
235149
245149
255149
265248
275248
285248
295149
305248

Chance of precipitation in September

Any precipitation

Clarksburg gets around 4.1 in of rain over 10.7 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 34% and peaks near 36% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
133
233
333
433
533
633
733
833
933
1033
1133
1233
1333
1433
1533
1634
1734
1834
1935
2035
2135
2236
2336
2436
2536
2636
2736
2835
2935
3035

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 36% of days. Sticky, muggy-or-worse air turns up on roughly 16% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1152030277
2162030277
3182129266
4192229256
5202228245
6222328234
7232428224
8252427203
9262527193
10282527182
11292626172
12302626161
13322626151
14332725141
15342725131
16362725121
17382724110
18392624100
19412624100
2042252390
2144252380
2246242270
2348242170
2451232060
2552232050
2653231950
2755221850
2857221740
2959211640
3060211540

Wind in September

Winds average 5 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
125calm
135calm
145calm
155calm
165calm
175calm
185calm
195calm
205calm
215calm
225calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 54 min at the start of September to 11 h 36 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 78 minutes over September. Sunrise moves from 5:54 AM to 6:22 AM, and sunset from 6:48 PM to 6:00 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.95:546:48
212.95:556:47
312.85:566:45
412.85:576:43
512.75:586:42
612.75:596:40
712.66:006:38
812.66:016:37
912.66:026:35
1012.56:026:33
1112.56:036:32
1212.46:046:30
1312.46:056:28
1412.36:066:27
1512.36:076:25
1612.36:086:23
1712.26:096:22
1812.26:106:20
1912.16:116:18
2012.16:126:17
2112.06:136:15
2212.06:146:13
2311.96:156:11
2411.96:166:10
2511.96:176:08
2611.86:186:06
2711.86:196:05
2811.76:206:03
2911.76:216:01
3011.66:226:00

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.33 kWh/m².

For context, solar energy here swings from a low near 1.61 kWh/m² to a high of 6 kWh/m² in June across the year — September's 4.33 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.9Bright
24.9Bright
34.8Bright
44.8Bright
54.8Bright
64.8Bright
74.7Bright
84.7Bright
94.7Bright
104.6Bright
114.6Bright
124.5Bright
134.5Bright
144.4Bright
154.4Bright
164.3Bright
174.3Bright
184.2Bright
194.2Bright
204.1Bright
214.1Bright
224.0Bright
234.0Bright
244.0Moderate
253.9Moderate
263.9Moderate
273.9Moderate
283.8Moderate
293.8Moderate
303.8Moderate
Planning a trip in September

Is September a good time to visit Clarksburg?

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

6.8
Sightseeing
1st-best month of the year
5.6
Beach & pool
4th-best month of the year

September is a reasonable time to visit Clarksburg for sightseeing.

What to pack for Clarksburg in September

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

In September, Clarksburg sees daytime highs around 75°F and nights near 57°F. Worth packing: light clothes and rain gear. About 11 days see rain.

light clothesrain gear

UV index in Clarksburg in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Clarksburg peaks around June 19 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 23 at about 2 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 9 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateJun 19UV 9Dec 23UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5Moderate
Apr6High
May8Very high
Jun9Very high
Jul9Very high
Aug8Very high
Sep6High
Oct4Moderate
Nov3Moderate
Dec2Low

Air quality in Clarksburg 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 Clarksburg is worst in July — around 16 µg/m³ PM2.5 (moderate), about 2.8× the cleanest month (November, 6 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1116 µg/m³Nov 216 µg/m³
PM2.5 (µg/m³)Level
Jan7Good
Feb8Good
Mar9Good
Apr10Good
May12Moderate
Jun15Moderate
Jul16Moderate
Aug13Moderate
Sep10Good
Oct6Good
Nov6Good
Dec6Good
Location & terrain

Where is Clarksburg?

Clarksburg sits at 39.3°N, 80.3°W, 994 ft above sea level, in United States. The nearest listed city is Fairmont, 18 mi away.

Topography around Clarksburg

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

Within 2 miles, the terrain around Clarksburg has only modest variations in elevation — a maximum elevation change of 604 ft around an average of 1,109 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 991 ft; within 50 miles, large variations in elevation — a maximum elevation change of 3,661 ft.

The land around Clarksburg is covered by trees (69%) within 2 miles, trees (77%) and grassland (20%) within 10 miles, and trees (90%) within 50 miles.

2 miles
604 ft
10 miles
991 ft
50 miles
3,661 ft
treesgrasslandartificial surfaces
September weather nearby: Fairmont 18 mi · Morgantown 32 mi · Wheeling 58 mi · Parkersburg 65 mi · Bethel Park 74 mi · Upper Saint Clair 74 mi · Baldwin 76 mi · Mount Lebanon 76 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 Clarksburg (39.2807°, -80.3445°, elevation 994 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).