Fairmont weather in September

In September, Fairmont sees average daytime highs of 75°F and overnight lows near 56°F, with 4.2 in of rain across 10.4 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 7th-wettest month of the year here.

Highs ease over the month, from about 78°F in the first days to 71°F by the end. The sky is clear or mostly clear about 35% 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 Fairmont's 1st-clearest and 10th-windiest month. For the whole year in context, see Fairmont's year-round climate.

Daytime high
75°
4th warmest
Overnight low
56°
9th coldest
Rainfall
4.2 in
10.4 wet days
Daylight
12 h 18 min
6:07 AM – 6:23 PM
Cloud cover
55%
1st clearest
Wind
5 mph
10th windiest
Solar energy
4.31 kWh/m²
Travel score
6.8
out of 10

Fairmont is county seat of Marion County, West Virginia, United States.

Density
803/km²
people per km²
Founded
1819

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 78°F in the first days to 71°F by the end.

A typical September day in Fairmont reaches about 75°F in the afternoon and slips back to 56°F overnight — a 18°F spread between the day's warmth and the night's chill. On most days the high lands between 65°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
37861
47860
57860
67860
77859
87759
97759
107758
117658
127658
137657
147557
157557
167556
177456
187456
197455
207355
217355
227354
237254
247254
257253
267153
277153
287152
297052
307051

How September really feels in Fairmont

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.

Fairmont 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
Jan39° / 25°4.012.96.69.50.0
Feb42° / 27°3.811.75.410.40.4
Mar52° / 34°4.713.93.511.72.4
Apr64° / 44°4.914.20.9134.9
May71° / 53°5.615.3014.15.7
Jun78° / 61°5.514.4014.76.0
Jul81° / 65°5.615.7014.55.7
Aug80° / 63°4.312.2013.66.2
Sep75° / 56°4.210.4012.36.8
Oct64° / 46°3.710.60.2115.6
Nov52° / 36°3.710.71.59.82.8
Dec43° / 30°4.112.34.59.30.5

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 35% of the time in September, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 19% of September, with mostly cloudy or overcast conditions the remaining 47%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15842
25842
35842
45743
55743
65743
75743
85743
95644
105644
115545
125446
135446
145347
155248
165248
175149
185050
195050
204951
214951
224951
235050
245050
255050
265149
275248
285248
295248
305347

Chance of precipitation in September

Any precipitation

Fairmont gets around 4.2 in of rain over 10.4 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
732
832
932
1032
1132
1232
1332
1433
1533
1633
1734
1834
1934
2035
2135
2236
2336
2436
2536
2636
2736
2836
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 37% 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 (%)
1162228278
2172227268
3182327257
4192327247
5212427236
6222426225
7242526215
8252526204
9262625193
10282625183
11292725172
12312725162
13322724152
14342724141
15352724131
16372723121
17382623111
18402623111
19422522101
2044252291
2146242181
2248242070
2350232070
2452231960
2554221860
2655221850
2757211750
2859211640
2961201540
3061201540

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
216calm
226calm
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 5:53 AM to 6:21 AM, and sunset from 6:48 PM to 5:59 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.95:536:48
212.95:546:46
312.85:556:44
412.85:566:43
512.75:576:41
612.75:586:39
712.65:596:38
812.66:006:36
912.66:016:34
1012.56:026:33
1112.56:036:31
1212.46:036:29
1312.46:046:28
1412.36:056:26
1512.36:066:24
1612.36:076:23
1712.26:086:21
1812.26:096:19
1912.16:106:17
2012.16:116:16
2112.06:126:14
2212.06:136:12
2311.96:146:11
2411.96:156:09
2511.96:166:07
2611.86:176:06
2711.86:186:04
2811.76:196:02
2911.76:206:01
3011.66:215:59

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.31 kWh/m².

For context, solar energy here swings from a low near 1.58 kWh/m² to a high of 5.99 kWh/m² in June across the year — September's 4.31 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.9Bright
24.9Bright
34.8Bright
44.8Bright
54.8Bright
64.7Bright
74.7Bright
84.7Bright
94.6Bright
104.6Bright
114.5Bright
124.5Bright
134.5Bright
144.4Bright
154.4Bright
164.3Bright
174.3Bright
184.2Bright
194.2Bright
204.1Bright
214.1Bright
224.0Bright
234.0Moderate
243.9Moderate
253.9Moderate
263.9Moderate
273.8Moderate
283.8Moderate
293.8Moderate
303.7Moderate
Planning a trip in September

Is September a good time to visit Fairmont?

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
5.5
Beach & pool
4th-best month of the year

September is a reasonable time to visit Fairmont for sightseeing.

What to pack for Fairmont in September

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

In September, Fairmont sees daytime highs around 75°F and nights near 56°F. Worth packing: light clothes and rain gear. About 10 days see rain.

light clothesrain gear

UV index in Fairmont 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 Fairmont 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 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateLowJun 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 Fairmont 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 Fairmont is worst in July — around 17 µg/m³ PM2.5 (moderate), about 2.5× the cleanest month (November, 7 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1217 µg/m³Nov 187 µg/m³
PM2.5 (µg/m³)Level
Jan9Good
Feb10Good
Mar10Good
Apr11Good
May14Moderate
Jun17Moderate
Jul17Moderate
Aug15Moderate
Sep12Good
Oct8Good
Nov7Good
Dec7Good
Location & terrain

Where is Fairmont?

Fairmont sits at 39.5°N, 80.1°W, 984 ft above sea level, in United States. The nearest listed city is Morgantown, 14 mi away.

Topography around Fairmont

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

Within 2 miles, the terrain around Fairmont has only modest variations in elevation — a maximum elevation change of 535 ft around an average of 1,063 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 1,204 ft; within 50 miles, large variations in elevation — a maximum elevation change of 3,524 ft.

The land around Fairmont is covered by trees (64%) within 2 miles, trees (79%) within 10 miles, and trees (86%) within 50 miles.

2 miles
535 ft
10 miles
1,204 ft
50 miles
3,524 ft
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Morgantown 14 mi · Clarksburg 18 mi · Wheeling 50 mi · Bethel Park 58 mi · Upper Saint Clair 59 mi · Baldwin 60 mi · Mount Lebanon 60 mi · McKeesport 62 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 Fairmont (39.4851°, -80.1426°, elevation 984 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).