Winchester weather in September

In September, Winchester sees average daytime highs of 77°F and overnight lows near 58°F, with 4.2 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 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 Winchester's 2nd-clearest and 9th-windiest month. For the whole year in context, see Winchester's year-round climate.

Daytime high
77°
4th warmest
Overnight low
58°
9th coldest
Rainfall
4.2 in
9.2 wet days
Daylight
12 h 18 min
5:59 AM – 6:15 PM
Cloud cover
56%
2nd clearest
Wind
5 mph
9th windiest
Solar energy
4.26 kWh/m²
Travel score
6.9
out of 10

Winchester is independent city in Virginia, United States.

Density
1,138/km²
people per km²
Founded
1752

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 Winchester reaches about 77°F in the afternoon and slips back to 58°F overnight — a 19°F spread between the day's warmth and the night's chill. On most days the high lands between 67°F and 87°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)
18263
28263
38263
48162
58162
68162
78061
88061
98061
107960
117960
127859
137859
147859
157758
167758
177758
187657
197657
207556
217556
227556
237455
247455
257355
267354
277354
287253
297253
307153

How September really feels in Winchester

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.

Winchester 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° / 25°2.98.33.59.60.0
Feb44° / 27°2.68.33.610.50.6
Mar52° / 34°3.710.42.811.72.8
Apr64° / 44°3.6110.2135.5
May72° / 53°4.112.4014.16.3
Jun81° / 62°3.611.8014.75.9
Jul85° / 67°3.511.3014.55.0
Aug84° / 65°2.910.1013.55.6
Sep77° / 58°4.29.2012.36.9
Oct65° / 46°3.28.10.1116.2
Nov54° / 36°2.97.60.69.93.4
Dec44° / 29°3.28.82.69.30.8

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 48%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15347
25347
35347
45347
55347
65347
75446
85446
95446
105446
115347
125347
135347
145347
155248
165248
175149
185149
195050
204951
215050
225050
235149
245149
255248
265248
275347
285446
295545
305545

Chance of precipitation in September

Any precipitation

Winchester gets around 4.2 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 32% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
129
229
329
429
529
629
729
829
928
1028
1128
1228
1328
1428
1528
1628
1729
1829
1930
2030
2131
2231
2331
2432
2531
2631
2731
2831
2930
3030

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 43% of days. Sticky, muggy-or-worse air turns up on roughly 15% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1252421236
2272421236
3282420226
4302419216
5312419216
6332418205
7342418195
8362418184
9372418174
10382418173
11392318163
12402319152
13412319142
14422319132
15432319131
16442319121
17452419111
18462419101
1947241991
2048241990
2149241880
2250241880
2352241770
2453231770
2554231670
2656221660
2757221560
2858211560
2960211450
3061201450

Wind in September

Winds average 5 mph in September.

Across September, daily wind ranges from about 5 mph on the calmest days to 5 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
275calm
285calm
295calm
305calm

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 5:45 AM to 6:13 AM, and sunset from 6:39 PM to 5:51 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.95:456:39
212.95:466:38
312.85:476:36
412.85:486:34
512.75:496:33
612.75:506:31
712.65:516:30
812.65:526:28
912.65:536:26
1012.55:546:25
1112.55:556:23
1212.45:566:21
1312.45:576:20
1412.35:586:18
1512.35:586:16
1612.35:596:15
1712.26:006:13
1812.26:016:11
1912.16:026:09
2012.16:036:08
2112.06:046:06
2212.06:056:04
2311.96:066:03
2411.96:076:01
2511.96:085:59
2611.86:095:58
2711.86:105:56
2811.76:115:54
2911.76:125:53
3011.66:135:51

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 1.89 kWh/m² to a high of 6.13 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
34.7Bright
44.7Bright
54.7Bright
64.6Bright
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 Winchester?

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
6.2
Beach & pool
4th-best month of the year

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

What to pack for Winchester in September

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

In September, Winchester sees daytime highs around 77°F and nights near 58°F. Worth packing: light clothes and rain gear. About 9 days see rain.

light clothesrain gear

UV index in Winchester 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 Winchester peaks around June 23 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 23UV 9Dec 21UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5High
Apr6High
May8Very high
Jun9Very high
Jul9Very high
Aug7Very high
Sep6High
Oct4Moderate
Nov2Moderate
Dec2Low

Air quality in Winchester 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 Winchester 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 1317 µg/m³Nov 138 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb11Good
Mar12Moderate
Apr13Moderate
May15Moderate
Jun16Moderate
Jul17Moderate
Aug14Moderate
Sep12Good
Oct8Good
Nov8Good
Dec9Good
Location & terrain

Where is Winchester?

Winchester sits at 39.2°N, 78.2°W, 709 ft above sea level, in United States. The nearest listed city is Front Royal, 19 mi away.

Topography around Winchester

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

Within 2 miles, the terrain around Winchester has only modest variations in elevation — a maximum elevation change of 358 ft around an average of 748 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 1,814 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 4,183 ft.

The land around Winchester is covered by trees (45%) and artificial surfaces (35%) within 2 miles, trees (51%) and grassland (37%) within 10 miles, and trees (70%) and grassland (21%) within 50 miles.

2 miles
358 ft
10 miles
1,814 ft
50 miles
4,183 ft
treesgrasslandcroplandartificial surfacesbare terrain
September weather nearby: Front Royal 19 mi · Martinsburg 22 mi · Leesburg 32 mi · Ashburn 37 mi · Hagerstown 39 mi · South Riding 40 mi · Ballenger Creek 41 mi · Sterling 41 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 Winchester (39.1857°, -78.1633°, elevation 709 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).