York weather in September

In September, York sees average daytime highs of 77°F and overnight lows near 60°F, with 4.3 in of rain across 9.1 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 81°F in the first days to 72°F by the end. The sky is clear or mostly clear about 36% 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 York's 2nd-clearest and 9th-windiest month. For the whole year in context, see York's year-round climate.

Daytime high
77°
4th warmest
Overnight low
60°
9th coldest
Rainfall
4.3 in
9.1 wet days
Daylight
12 h 18 min
5:53 AM – 6:09 PM
Cloud cover
56%
2nd clearest
Wind
6 mph
9th windiest
Solar energy
4.23 kWh/m²
Travel score
6.9
out of 10

York is city in and county seat of York County, Pennsylvania, United States.

Density
3,180/km²
people per km²
Founded
1741

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 81°F in the first days to 72°F by the end.

A typical September day in York reaches about 77°F in the afternoon and slips back to 60°F overnight — a 17°F spread between the day's warmth and the night's chill. On most days the high lands between 67°F and 86°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)
18264
28164
38164
48164
58063
68063
78063
88062
97962
107962
117961
127861
137861
147860
157760
167760
177659
187659
197658
207558
217558
227457
237457
247456
257356
267356
277355
287255
297255
307154

How September really feels in York

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.

York 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
Jan39° / 26°3.19.14.19.50.0
Feb42° / 27°2.88.83.910.40.4
Mar51° / 34°3.810.1311.72.6
Apr63° / 45°3.610.60.3135.4
May73° / 55°3.511.4014.26.4
Jun81° / 64°3.410.7014.86.0
Jul86° / 69°3.610.5014.55.0
Aug83° / 67°3.210.1013.65.7
Sep77° / 60°4.39.1012.36.9
Oct65° / 48°3.58.20.110.96.1
Nov53° / 38°3.08.10.69.83.3
Dec44° / 31°3.58.92.39.20.7

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 36% 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 47%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15347
25347
35347
45347
55347
65347
75347
85248
95347
105347
115347
125347
135446
145347
155347
165347
175347
185248
195248
205347
215347
225347
235347
245248
255248
265347
275347
285347
295446
305446

Chance of precipitation in September

Any precipitation

York gets around 4.3 in of rain over 9.1 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
229
329
429
529
629
728
828
928
1028
1127
1227
1327
1427
1527
1627
1727
1828
1929
2029
2130
2230
2331
2431
2531
2631
2731
2831
2931
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 42% of days. Sticky, muggy-or-worse air turns up on roughly 18% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1212621257
2222621247
3232620247
4252620236
5262619226
6282619216
7292619215
8312618205
9322518205
10342518194
11352518194
12372418183
13382418183
14402318172
15422318162
16432218152
17442218152
18462218141
19472117131
20482117121
21502117121
22502117111
23522017101
24532017100
2556191690
2657191680
2758181680
2859181670
2960171670
3060171670

Wind in September

Winds average 6 mph in September.

Across September, daily wind ranges from about 6 mph on the calmest days to 6 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (mph)Feels
16calm
26calm
36calm
46calm
56calm
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 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 5:39 AM to 6:07 AM, and sunset from 6:34 PM to 5:45 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.95:396:34
212.95:406:33
312.85:416:31
412.85:426:29
512.75:436:28
612.75:446:26
712.75:456:24
812.65:466:23
912.65:476:21
1012.55:486:19
1112.55:496:18
1212.45:506:16
1312.45:516:14
1412.35:526:12
1512.35:526:11
1612.35:536:09
1712.25:546:07
1812.25:556:06
1912.15:566:04
2012.15:576:02
2112.05:586:00
2212.05:595:59
2311.96:005:57
2411.96:015:55
2511.96:025:54
2611.86:035:52
2711.86:045:50
2811.76:055:48
2911.76:065:47
3011.66:075:45

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.23 kWh/m².

For context, solar energy here swings from a low near 1.79 kWh/m² to a high of 6.09 kWh/m² in June across the year — September's 4.23 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.8Bright
24.8Bright
34.7Bright
44.7Bright
54.7Bright
64.6Bright
74.6Bright
84.5Bright
94.5Bright
104.5Bright
114.4Bright
124.4Bright
134.3Bright
144.3Bright
154.3Bright
164.2Bright
174.2Bright
184.2Bright
194.1Bright
204.1Bright
214.0Bright
224.0Bright
234.0Moderate
243.9Moderate
253.9Moderate
263.9Moderate
273.8Moderate
283.8Moderate
293.7Moderate
303.7Moderate
Planning a trip in September

Is September a good time to visit York?

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
6.1
Beach & pool
4th-best month of the year

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

What to pack for York in September

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

In September, York sees daytime highs around 77°F and nights near 60°F. Worth packing: light clothes and rain gear. About 9 days see rain.

light clothesrain gear

UV index in York 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 York peaks around June 22 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 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 20UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5Moderate
Apr6High
May8Very high
Jun9Very high
Jul9Very high
Aug7High
Sep6High
Oct3Moderate
Nov2Moderate
Dec2Low

Air quality in York 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 York is worst in July — around 17 µg/m³ PM2.5 (moderate), about 2.1× the cleanest month (November, 8 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1417 µg/m³Nov 138 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb12Good
Mar13Moderate
Apr13Moderate
May15Moderate
Jun16Moderate
Jul17Moderate
Aug15Moderate
Sep12Good
Oct9Good
Nov8Good
Dec9Good
Location & terrain

Where is York?

York sits at 40.0°N, 76.7°W, 387 ft above sea level, in United States. The nearest listed city is Hanover, 17 mi away.

Topography around York

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

Within 2 miles, the terrain around York has only modest variations in elevation — a maximum elevation change of 676 ft around an average of 436 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 951 ft; within 50 miles, large variations in elevation — a maximum elevation change of 2,398 ft.

The land around York is covered by artificial surfaces (51%) and trees (29%) within 2 miles, trees (45%), grassland (25%) and cropland (20%) within 10 miles, and trees (53%) and cropland (22%) within 50 miles.

2 miles
676 ft
10 miles
951 ft
50 miles
2,398 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Hanover 17 mi · Lancaster 23 mi · Harrisburg 23 mi · Carlisle 29 mi · Westminster 30 mi · Lebanon 31 mi · Hunt Valley 32 mi · Cockeysville 34 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 York (39.9626°, -76.7277°, elevation 387 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).