Manchester weather in September

In September, Manchester sees average daytime highs of 72°F and overnight lows near 53°F, with 3.4 in of rain across 8.4 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 67°F by the end. The sky is clear or mostly clear about 37% 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 Manchester's 1st-clearest and 10th-windiest month. For the whole year in context, see Manchester's year-round climate.

Daytime high
72°
4th warmest
Overnight low
53°
9th coldest
Rainfall
3.4 in
8.4 wet days
Daylight
12 h 18 min
5:31 AM – 5:49 PM
Cloud cover
55%
1st clearest
Wind
6 mph
10th windiest
Solar energy
4.1 kWh/m²
Travel score
6.9
out of 10

Manchester is city in Hillsborough County in southern New Hampshire, United States.

Density
1,218/km²
people per km²
Founded
1722

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 67°F by the end.

A typical September day in Manchester reaches about 72°F in the afternoon and slips back to 53°F overnight — a 19°F spread between the day's warmth and the night's chill. On most days the high lands between 62°F and 83°F. Set against its neighbours, September runs about 8°F cooler than August and about 12°F warmer than October.

40°60°80°151015202530
Avg high (°F)Avg low (°F)
17858
27758
37758
47757
57657
67657
77656
87556
97556
107455
117455
127455
137354
147354
157354
167253
177253
187153
197152
207152
217051
227051
236951
246950
256950
266850
276849
286749
296749
306648

How September really feels in Manchester

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.

Manchester 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
Jan32° / 17°3.19.46.79.20.0
Feb35° / 18°3.08.76.410.20.0
Mar43° / 27°3.910.75.711.60.6
Apr56° / 38°3.710.51.713.13.6
May67° / 48°3.110.60.114.45.9
Jun76° / 57°3.611.6015.16.4
Jul82° / 63°3.510.4014.86.2
Aug80° / 61°3.49.7013.86.6
Sep72° / 53°3.48.4012.36.9
Oct60° / 42°4.09.40.410.84.8
Nov48° / 33°3.49.41.79.51.7
Dec37° / 23°4.110.25.98.90.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 37% of the time in September, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 15% of September, with mostly cloudy or overcast conditions the remaining 47%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15545
25545
35446
45446
55347
65347
75347
85347
95446
105446
115446
125446
135347
145347
155347
165347
175347
185347
195248
205248
215248
225248
235248
245149
255050
265050
275050
285050
295050
305149

Chance of precipitation in September

Any precipitation

Manchester gets around 3.4 in of rain over 8.4 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 28% and peaks near 31% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
125
225
325
425
526
626
726
827
927
1027
1128
1228
1328
1428
1528
1628
1728
1828
1928
2028
2129
2229
2329
2429
2530
2630
2730
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 59% of days. Sticky, muggy-or-worse air turns up on roughly 7% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1432618111
2442518111
3452518111
4462518101
5472418101
6482417101
749231791
851231790
951231790
1052221790
1154221680
1255211680
1356201680
1457201670
1559191570
1660191560
1761181560
1863181450
1964171450
2064171450
2165171350
2268161240
2368161240
2470151140
2571151130
2672151030
277414930
287614820
297614820
307813720

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 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 5:15 AM to 5:48 AM, and sunset from 6:16 PM to 5:23 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.05:156:16
213.05:166:15
312.95:176:13
412.95:186:11
512.85:196:09
612.85:206:07
712.75:216:06
812.75:236:04
912.65:246:02
1012.65:256:00
1112.55:265:58
1212.55:275:56
1312.45:285:54
1412.45:295:53
1512.35:305:51
1612.35:315:49
1712.25:335:47
1812.25:345:45
1912.15:355:43
2012.15:365:41
2112.05:375:39
2212.05:385:38
2311.95:395:36
2411.95:415:34
2511.85:425:32
2611.85:435:30
2711.75:445:28
2811.75:455:26
2911.65:465:25
3011.65:485:23

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.1 kWh/m².

For context, solar energy here swings from a low near 1.56 kWh/m² to a high of 5.86 kWh/m² in July across the year — September's 4.1 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
154.1Bright
164.1Bright
174.1Bright
184.0Bright
194.0Moderate
203.9Moderate
213.9Moderate
223.8Moderate
233.8Moderate
243.7Moderate
253.7Moderate
263.6Moderate
273.6Moderate
283.5Moderate
293.5Moderate
303.5Moderate
Planning a trip in September

Hazard calendar for Manchester

In seasonPeak

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

Manchester 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 Manchester?

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
4.9
Beach & pool
4th-best month of the year

September is a reasonable time to visit Manchester for sightseeing.

What to pack for Manchester in September

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

In September, Manchester sees daytime highs around 72°F and nights near 53°F. Worth packing: light clothes and rain gear. About 8 days see rain.

light clothesrain gear

Sea temperature near Manchester in September

The nearest coast averages about 62°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 43 mi away) is warmest in August at about 65°F and coldest in March near 39°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
Jan42Bracing
Feb40Bracing
Mar39Bracing
Apr42Bracing
May49Bracing
Jun57Bracing
Jul64Cool
Aug65Cool
Sep62Cool
Oct56Bracing
Nov49Bracing
Dec46Bracing

UV index in Manchester 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 Manchester 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 December 23 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 7Dec 23UV 1
UV index (midday)Level
Jan1Low
Feb3Moderate
Mar4Moderate
Apr5High
May7Very high
Jun7High
Jul7Very high
Aug5Moderate
Sep6High
Oct3Moderate
Nov2Moderate
Dec1Low

Air quality in Manchester 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 Manchester 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 Manchester?

Manchester sits at 43.0°N, 71.5°W, 262 ft above sea level, in United States. The nearest listed city is Bedford, 4.3 mi away.

Topography around Manchester

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

Within 2 miles, the terrain around Manchester has only modest variations in elevation — a maximum elevation change of 459 ft around an average of 295 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 1,237 ft; within 50 miles, large variations in elevation — a maximum elevation change of 3,176 ft.

The land around Manchester is covered by artificial surfaces (50%) and trees (37%) within 2 miles, trees (81%) within 10 miles, and trees (82%) within 50 miles.

2 miles
459 ft
10 miles
1,237 ft
50 miles
3,176 ft
treesgrasslandcroplandartificial surfaceswaterwetland
September weather nearby: Bedford 4.3 mi · Merrimack 9.3 mi · Derry Village 9.9 mi · Derry 9.9 mi · Concord 16 mi · Nashua 16 mi · East Concord 17 mi · Salem 19 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 Manchester (42.9956°, -71.4548°, elevation 262 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).