Martinsburg weather in September

In September, Martinsburg sees average daytime highs of 78°F and overnight lows near 59°F, with 4.1 in of rain across 9.2 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 1st-wettest month of the year here.

Highs ease over the month, from about 82°F in the first days to 73°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 Martinsburg's 2nd-clearest and 9th-windiest month. For the whole year in context, see Martinsburg's year-round climate.

Daytime high
78°
4th warmest
Overnight low
59°
9th coldest
Rainfall
4.1 in
9.2 wet days
Daylight
12 h 18 min
5:59 AM – 6:14 PM
Cloud cover
56%
2nd clearest
Wind
5 mph
9th windiest
Solar energy
4.26 kWh/m²
Travel score
6.9
out of 10

Martinsburg is city in West Virginia, United States.

Density
1,026/km²
people per km²
Founded
1778

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 82°F in the first days to 73°F by the end.

A typical September day in Martinsburg reaches about 78°F in the afternoon and slips back to 59°F overnight — a 19°F spread between the day's warmth and the night's chill. On most days the high lands between 68°F and 88°F. Set against its neighbours, September runs about 7°F cooler than August and about 12°F warmer than October.

40°60°80°151015202530
Avg high (°F)Avg low (°F)
18364
28264
38263
48263
58263
68162
78162
88162
98061
108061
118061
127960
137960
147859
157859
167859
177758
187758
197658
207657
217657
227556
237556
247456
257455
267455
277355
287354
297254
307253

How September really feels in Martinsburg

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.

Martinsburg 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
Jan40° / 26°3.08.83.69.50.0
Feb43° / 27°2.78.33.510.40.6
Mar52° / 34°3.810.12.511.72.8
Apr64° / 45°3.610.80.2135.6
May73° / 54°3.911.7014.16.4
Jun82° / 63°3.410.5014.75.9
Jul87° / 68°3.410.5014.54.8
Aug85° / 66°2.89.5013.55.4
Sep78° / 59°4.19.2012.36.9
Oct66° / 47°3.37.90116.3
Nov54° / 37°3.07.60.59.83.4
Dec44° / 30°3.38.62.39.30.7

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 16% of September, with mostly cloudy or overcast conditions the remaining 49%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15347
25248
35248
45248
55248
65248
75248
85248
95248
105248
115248
125248
135248
145149
155149
165050
175050
184951
194852
204852
214852
224951
234951
245050
255149
265149
275248
285347
295347
305446

Chance of precipitation in September

Any precipitation

Martinsburg gets around 4.1 in of rain over 9.2 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 29% and peaks near 31% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
128
228
329
429
529
629
729
829
929
1029
1129
1228
1328
1428
1528
1628
1728
1829
1929
2030
2130
2230
2331
2431
2531
2631
2730
2830
2930
3029

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 42% of days. Sticky, muggy-or-worse air turns up on roughly 17% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1252520256
2262519246
3272518246
4292518236
5302518226
6322417215
7332417215
8342417204
9362417194
10372317193
11382318183
12392318182
13402318172
14412318162
15422318151
16432318141
17442319131
18452319131
19462319121
20472318110
21482318100
2249231890
2350231890
2453221780
2553221780
2655211770
2756211670
2858201660
2959191660
3060191560

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
235calm
245calm
255calm
265calm
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 5:44 AM to 6:12 AM, and sunset from 6:39 PM to 5:50 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.95:446:39
212.95:456:37
312.85:466:36
412.85:476:34
512.75:486:32
612.75:496:31
712.65:506:29
812.65:516:27
912.65:526:26
1012.55:536:24
1112.55:546:22
1212.45:556:21
1312.45:566:19
1412.35:576:17
1512.35:586:16
1612.35:596:14
1712.25:596:12
1812.26:006:10
1912.16:016:09
2012.16:026:07
2112.06:036:05
2212.06:046:04
2311.96:056:02
2411.96:066:00
2511.96:075:59
2611.86:085:57
2711.86:095:55
2811.76:105:54
2911.76:115:52
3011.66:125:50

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.26 kWh/m².

For context, solar energy here swings from a low near 1.84 kWh/m² to a high of 6.14 kWh/m² in June across the year — September's 4.26 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.8Bright
24.8Bright
34.8Bright
44.7Bright
54.7Bright
64.7Bright
74.6Bright
84.6Bright
94.5Bright
104.5Bright
114.5Bright
124.4Bright
134.4Bright
144.3Bright
154.3Bright
164.3Bright
174.2Bright
184.2Bright
194.2Bright
204.1Bright
214.1Bright
224.0Bright
234.0Moderate
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 Martinsburg?

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

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

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

What to pack for Martinsburg in September

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

In September, Martinsburg sees daytime highs around 78°F and nights near 59°F. Worth packing: light clothes and rain gear. About 9 days see rain.

light clothesrain gear

UV index in Martinsburg 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 Martinsburg peaks around June 22 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 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 highHighModerateLowJun 22UV 9Dec 21UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5Moderate
Apr6High
May8Very high
Jun9Very high
Jul9Very high
Aug7Very high
Sep6High
Oct3Moderate
Nov2Moderate
Dec2Low

Air quality in Martinsburg 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 Martinsburg is worst in July — around 16 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (November, 7 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1316 µg/m³Nov 137 µg/m³
PM2.5 (µg/m³)Level
Jan9Good
Feb11Good
Mar12Good
Apr12Good
May14Moderate
Jun16Moderate
Jul16Moderate
Aug14Moderate
Sep11Good
Oct8Good
Nov7Good
Dec8Good
Location & terrain

Where is Martinsburg?

Martinsburg sits at 39.5°N, 78.0°W, 453 ft above sea level, in United States. The nearest listed city is Hagerstown, 18 mi away.

Topography around Martinsburg

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

Within 2 miles, the terrain around Martinsburg has only modest variations in elevation — a maximum elevation change of 518 ft around an average of 492 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 1,526 ft; within 50 miles, large variations in elevation — a maximum elevation change of 3,386 ft.

The land around Martinsburg is covered by trees (52%), artificial surfaces (25%) and grassland (21%) within 2 miles, trees (57%) and grassland (30%) within 10 miles, and trees (67%) and grassland (20%) within 50 miles.

2 miles
518 ft
10 miles
1,526 ft
50 miles
3,386 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Hagerstown 18 mi · Winchester 22 mi · Ballenger Creek 29 mi · Frederick 30 mi · Leesburg 32 mi · Chambersburg 37 mi · Ashburn 39 mi · Front Royal 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 Martinsburg (39.4562°, -77.9639°, elevation 453 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).