Back Mountain weather in September

In September, Back Mountain sees average daytime highs of 72°F and overnight lows near 54°F, with 3.9 in of rain across 9.1 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 2nd-wettest month of the year here.

Highs ease over the month, from about 76°F in the first days to 67°F by the end. The sky is clear or mostly clear about 32% of the time in September, and the air most often feels dry.

Daylight stretches from about 13 hours at the start of September to 11 h 36 min by month's end. Set against the rest of the year, September is Back Mountain's 1st-clearest and 9th-windiest month. For the whole year in context, see Back Mountain's year-round climate.

Daytime high
72°
4th warmest
Overnight low
54°
9th coldest
Rainfall
3.9 in
9.1 wet days
Daylight
12 h 18 min
5:50 AM – 6:06 PM
Cloud cover
58%
1st clearest
Wind
6 mph
9th windiest
Solar energy
4.13 kWh/m²
Travel score
6.8
out of 10

Back Mountain is unincorporated community.

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 76°F in the first days to 67°F by the end.

A typical September day in Back Mountain reaches about 72°F in the afternoon and slips back to 54°F overnight — a 18°F spread between the day's warmth and the night's chill. On most days the high lands between 62°F and 82°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)
17759
27759
37659
47658
57658
67658
77558
87557
97457
107456
117456
127456
137355
147355
157355
167254
177254
187154
197153
207153
217052
227052
236952
246951
256951
266851
276850
286750
296750
306749

How September really feels in Back Mountain

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.

Back Mountain weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan33° / 20°3.19.46.49.40.0
Feb36° / 21°2.695.610.30.0
Mar45° / 29°3.6114.611.71.0
Apr58° / 40°3.611.41.213.14.0
May68° / 49°3.512.5014.35.8
Jun76° / 58°3.911.8014.96.4
Jul81° / 63°3.010.6014.76.4
Aug79° / 62°3.39.7013.76.7
Sep72° / 54°3.99.1012.36.8
Oct60° / 44°3.69.30.310.94.8
Nov48° / 34°3.18.51.69.71.8
Dec38° / 26°3.310.159.10.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 32% of the time in September, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 17% of September, with mostly cloudy or overcast conditions the remaining 51%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14951
24852
34852
44951
54951
64753
74753
84951
94951
104852
114951
124951
134951
144951
154951
164951
174951
185050
195050
205050
215050
224951
234951
244951
255050
264951
274852
284852
294852
304852

Chance of precipitation in September

Any precipitation

Back Mountain gets around 3.9 in of rain over 9.1 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 32% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
127
227
327
428
528
628
728
828
928
1029
1129
1229
1329
1429
1529
1629
1729
1829
1930
2030
2130
2231
2331
2431
2531
2631
2731
2832
2932
3031

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 55% of days. Sticky, muggy-or-worse air turns up on roughly 8% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1372621142
2382621132
3392621132
4402620122
5412520122
6422520112
7432519112
8442419102
9462419101
10472418101
1148231891
1250231891
1351221791
1453221780
1553221780
1656211670
1756211670
1858201660
1960191560
2061191550
2162181550
2264171540
2366161440
2467161430
2569151330
2670151320
2771141320
2872141220
2973131220
3075131110

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
66calm
76calm
86calm
96calm
106calm
116calm
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 13 hours 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 84 minutes over September. Sunrise moves from 5:35 AM to 6:05 AM, and sunset from 6:33 PM to 5:42 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.05:356:33
212.95:366:31
312.95:376:29
412.85:386:28
512.85:396:26
612.75:406:24
712.75:416:22
812.65:426:21
912.65:436:19
1012.65:446:17
1112.55:456:15
1212.55:466:14
1312.45:476:12
1412.45:486:10
1512.35:496:08
1612.35:506:06
1712.25:516:05
1812.25:526:03
1912.15:536:01
2012.15:545:59
2112.05:555:58
2212.05:565:56
2311.95:585:54
2411.95:595:52
2511.86:005:50
2611.86:015:49
2711.86:025:47
2811.76:035:45
2911.76:045:43
3011.66:055:42

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.13 kWh/m².

For context, solar energy here swings from a low near 1.59 kWh/m² to a high of 5.99 kWh/m² in June across the year — September's 4.13 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.7Bright
24.7Bright
34.6Bright
44.6Bright
54.5Bright
64.5Bright
74.5Bright
84.4Bright
94.4Bright
104.3Bright
114.3Bright
124.3Bright
134.2Bright
144.2Bright
154.2Bright
164.1Bright
174.1Bright
184.1Bright
194.0Bright
204.0Moderate
213.9Moderate
223.9Moderate
233.9Moderate
243.8Moderate
253.8Moderate
263.7Moderate
273.7Moderate
283.6Moderate
293.6Moderate
303.5Moderate
Planning a trip in September

Is September a good time to visit Back Mountain?

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
4.8
Beach & pool
4th-best month of the year

September is a reasonable time to visit Back Mountain for sightseeing.

What to pack for Back Mountain in September

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

In September, Back Mountain sees daytime highs around 72°F and nights near 54°F. Worth packing: light clothes and rain gear. About 9 days see rain.

light clothesrain gear

UV index in Back Mountain 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 Back Mountain peaks around July 10 at about 8 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighModerateLowJul 10UV 8Dec 22UV 1
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5Moderate
Apr6High
May8Very high
Jun8Very high
Jul9Very high
Aug6High
Sep6High
Oct3Moderate
Nov2Moderate
Dec1Low

Air quality in Back Mountain 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 Back Mountain is worst in July — around 16 µg/m³ PM2.5 (moderate), about 2.3× the cleanest month (November, 7 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1416 µg/m³Nov 147 µg/m³
PM2.5 (µg/m³)Level
Jan9Good
Feb11Good
Mar11Good
Apr12Good
May15Moderate
Jun15Moderate
Jul16Moderate
Aug13Moderate
Sep11Good
Oct7Good
Nov7Good
Dec8Good
Location & terrain

Where is Back Mountain?

Back Mountain sits at 41.3°N, 76.0°W, 1,276 ft above sea level, in United States. The nearest listed city is Wilkes-Barre, 8.7 mi away.

Topography around Back Mountain

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

Within 2 miles, the terrain around Back Mountain has only modest variations in elevation — a maximum elevation change of 617 ft around an average of 1,306 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 1,864 ft; within 50 miles, large variations in elevation — a maximum elevation change of 2,372 ft.

The land around Back Mountain is covered by trees (70%) and grassland (21%) within 2 miles, trees (77%) within 10 miles, and trees (80%) within 50 miles.

2 miles
617 ft
10 miles
1,864 ft
50 miles
2,372 ft
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Wilkes-Barre 8.7 mi · Scranton 18 mi · Hazleton 26 mi · Vestal 52 mi · Williamsport 53 mi · Binghamton 53 mi · Whitehall Township 53 mi · Allentown 57 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 Back Mountain (41.3359°, -75.9963°, elevation 1,276 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).