Winchester weather in September

In September, Winchester sees average daytime highs of 73°F and overnight lows near 56°F, with 3.3 in of rain across 8.3 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 8th-wettest month of the year here.

Highs ease over the month, from about 77°F in the first days to 68°F by the end. The sky is clear or mostly clear about 38% 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 Winchester's 1st-clearest and 9th-windiest month. For the whole year in context, see Winchester's year-round climate.

Daytime high
73°
4th warmest
Overnight low
56°
9th coldest
Rainfall
3.3 in
8.3 wet days
Daylight
12 h 18 min
5:30 AM – 5:47 PM
Cloud cover
55%
1st clearest
Wind
7 mph
9th windiest
Solar energy
4.12 kWh/m²
Travel score
7.0
out of 10

Winchester is town in Middlesex County, Massachusetts, United States.

Founded
1640

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 77°F in the first days to 68°F by the end.

A typical September day in Winchester reaches about 73°F in the afternoon and slips back to 56°F overnight — a 17°F spread between the day's warmth and the night's chill. On most days the high lands between 64°F and 83°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)
17860
27860
37760
47760
57759
67659
77659
87658
97558
107558
117557
127457
137457
147456
157356
167356
177355
187255
197255
207254
217154
227154
237053
247053
257053
266952
276952
286851
296851
306851

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 8th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan35° / 21°3.39.66.29.20.0
Feb38° / 22°3.08.65.710.30.0
Mar45° / 30°4.2114.911.61.0
Apr57° / 40°3.710.61.213.13.9
May67° / 49°3.110.5014.46.0
Jun76° / 59°3.410.70156.5
Jul82° / 65°3.110.3014.86.1
Aug80° / 63°3.49.5013.76.6
Sep73° / 56°3.38.3012.37.0
Oct62° / 45°3.89.50.210.85.3
Nov50° / 35°3.49.31.19.62.3
Dec40° / 27°4.210.34.78.90.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 38% of the time in September, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 14% of September, with mostly cloudy or overcast conditions the remaining 48%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15446
25446
35347
45347
55347
65248
75248
85248
95248
105347
115347
125347
135347
145248
155248
165248
175347
185248
195248
205248
215149
225149
235149
245149
255149
265050
275149
285149
295149
305149

Chance of precipitation in September

Any precipitation

Winchester gets around 3.3 in of rain over 8.3 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 27% and peaks near 29% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
126
226
327
427
527
628
728
828
929
1029
1128
1228
1328
1428
1527
1627
1727
1826
1926
2026
2126
2226
2326
2427
2527
2627
2728
2828
2928
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 51% of days. Sticky, muggy-or-worse air turns up on roughly 11% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1322921153
2342920143
3342820143
4362820143
5372719143
6382719133
7392619132
8402619132
9422519132
10432418122
11452418122
12462318121
13482217111
14492217111
15502117111
16532016101
17532016101
1856191591
1956191591
2057191491
2159181481
2260181381
2361181281
2464171270
2565171170
2666171160
2768161060
2869161050
297115950
307215940

Wind in September

Winds average 7 mph in September.

Across September, daily wind ranges from about 6 mph on the calmest days to 7 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
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm

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 5:14 AM to 5:46 AM, and sunset from 6:15 PM to 5:22 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.05:146:15
213.05:156:13
312.95:166:11
412.95:176:09
512.85:186:07
612.85:196:06
712.75:216:04
812.75:226:02
912.65:236:00
1012.65:245:58
1112.55:255:57
1212.55:265:55
1312.45:275:53
1412.45:285:51
1512.35:295:49
1612.35:305:47
1712.25:315:46
1812.25:335:44
1912.15:345:42
2012.15:355:40
2112.05:365:38
2212.05:375:36
2311.95:385:34
2411.95:395:33
2511.85:405:31
2611.85:415:29
2711.75:435:27
2811.75:445:25
2911.65:455:24
3011.65:465:22

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.12 kWh/m².

For context, solar energy here swings from a low near 1.59 kWh/m² to a high of 5.9 kWh/m² in July across the year — September's 4.12 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.8Bright
24.7Bright
34.7Bright
44.6Bright
54.6Bright
64.5Bright
74.5Bright
84.4Bright
94.4Bright
104.3Bright
114.3Bright
124.3Bright
134.2Bright
144.2Bright
154.2Bright
164.1Bright
174.1Bright
184.0Bright
194.0Bright
204.0Moderate
213.9Moderate
223.9Moderate
233.8Moderate
243.8Moderate
253.7Moderate
263.7Moderate
273.6Moderate
283.6Moderate
293.6Moderate
303.5Moderate
Planning a trip in September

Hazard calendar for Winchester

In seasonPeak

In September, Winchester sits inside its atlantic hurricane season. The full year is below, with each hazard's peak months called out.

Winchester sits in the Atlantic hurricane belt; the season peaks August–October.

Atlantic hurricane
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

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).

7.0
Sightseeing
1st-best month of the year
5.2
Beach & pool
4th-best month of the year

September is one of the better times to visit Winchester for general sightseeing.

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 73°F and nights near 56°F. Worth packing: light clothes and rain gear. About 8 days see rain.

light clothesrain gear

Sea temperature near Winchester in September

The nearest coast averages about 63°F in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 14 mi away) is warmest in August at about 66°F and coldest in February near 38°F.

The water stays below 68°F all year — cool enough that most swimmers want a wetsuit.

40°50°60°70°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshing
Sea temperature (°F)Comfort
Jan41Bracing
Feb38Bracing
Mar38Bracing
Apr42Bracing
May50Bracing
Jun58Bracing
Jul65Cool
Aug66Cool
Sep63Cool
Oct56Bracing
Nov50Bracing
Dec46Bracing

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 July 10 at about 7 (very high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near January 1 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 highHighHighModerateLowJul 10UV 7Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb3Moderate
Mar4Moderate
Apr5High
May7Very high
Jun7Very high
Jul7Very high
Aug5Moderate
Sep6High
Oct3Moderate
Nov2Moderate
Dec1Low

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 16 µg/m³ PM2.5 (moderate), about 2.0× the cleanest month (November, 8 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1715 µg/m³Nov 188 µg/m³
PM2.5 (µg/m³)Level
Jan9Good
Feb13Moderate
Mar13Moderate
Apr13Moderate
May14Moderate
Jun13Moderate
Jul16Moderate
Aug14Moderate
Sep11Good
Oct9Good
Nov8Good
Dec9Good
Location & terrain

Where is Winchester?

Winchester sits at 42.5°N, 71.1°W, 20 ft above sea level, in United States. The nearest listed city is Woburn, 1.9 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 371 ft around an average of 135 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 584 ft; within 50 miles, large variations in elevation — a maximum elevation change of 2,329 ft.

The land around Winchester is covered by trees (72%) within 2 miles, trees (60%) and artificial surfaces (26%) within 10 miles, and trees (65%) and water (26%) within 50 miles.

2 miles
371 ft
10 miles
584 ft
50 miles
2,329 ft
treesgrasslandartificial surfaceswaterwetland
September weather nearby: Woburn 1.9 mi · Stoneham 2.5 mi · Arlington 2.5 mi · Medford 3.1 mi · Melrose 3.7 mi · Malden 4.3 mi · Belmont 4.3 mi · Lexington 4.3 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 (42.4523°, -71.137°, elevation 20 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. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. 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).