Hanover weather in September

In September, Hanover sees average daytime highs of 70°F and overnight lows near 59°F, with 3.7 in of rain across 8.2 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 7th-wettest month of the year here.

Highs ease over the month, from about 73°F in the first days to 66°F by the end. The sky is clear or mostly clear about 40% 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 Hanover's 1st-clearest and 9th-windiest month. For the whole year in context, see Hanover's year-round climate.

Daytime high
70°
4th warmest
Overnight low
59°
9th coldest
Rainfall
3.7 in
8.2 wet days
Daylight
12 h 18 min
5:29 AM – 5:46 PM
Cloud cover
53%
1st clearest
Wind
9 mph
9th windiest
Solar energy
4.27 kWh/m²
Travel score
6.8
out of 10

Hanover is town in Massachusetts, United States.

Founded
1649

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 73°F in the first days to 66°F by the end.

A typical September day in Hanover reaches about 70°F in the afternoon and slips back to 59°F overnight — a 10°F spread between the day's warmth and the night's chill. On most days the high lands between 63°F and 77°F. Set against its neighbours, September runs about 6°F cooler than August and about 9°F warmer than October.

40°50°60°70°80°151015202530
Avg high (°F)Avg low (°F)
17363
27363
37362
47362
57362
67262
77262
87261
97161
107161
117160
127160
137060
147060
157059
167059
176959
186958
196958
206858
216858
226857
236857
246757
256756
266756
276656
286656
296655
306555

How September really feels in Hanover

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.

Hanover weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan37° / 26°4.110.65.29.30.0
Feb38° / 27°3.59.5510.30.0
Mar43° / 33°4.811.34.511.70.6
Apr52° / 41°4.211.30.913.12.7
May61° / 50°3.311014.44.9
Jun71° / 59°3.49.20156.6
Jul77° / 66°2.88.9014.87.0
Aug76° / 65°3.39013.77.2
Sep70° / 59°3.78.2012.36.8
Oct60° / 50°4.69.60.110.85.0
Nov51° / 40°4.19.70.59.62.4
Dec42° / 32°4.811.33.590.4

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 40% 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 45%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15842
25743
35743
45743
55545
65545
75545
85545
95545
105446
115545
125545
135446
145446
155446
165446
175446
185446
195446
205446
215347
225446
235347
245446
255545
265446
275446
285545
295545
305644

Chance of precipitation in September

Any precipitation

Hanover gets around 3.7 in of rain over 8.2 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 30% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
125
225
326
426
526
626
726
826
927
1027
1127
1226
1326
1426
1526
1626
1726
1826
1927
2027
2127
2227
2328
2428
2528
2629
2729
2830
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 38% of days. Sticky, muggy-or-worse air turns up on roughly 14% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1192830203
2202929193
3212928193
4222928183
5242927183
6252827173
7262826173
8282826162
9292725162
10312725152
11322625152
12342624141
13352624141
14372523141
15382523131
16402522131
17412522120
18422521120
19432521110
20442520110
21452520110
22462519100
23472518100
2449251790
2550251690
2652251580
2752251580
2855241470
2957241360
3059231260

Wind in September

Winds average 9 mph in September.

Across September, daily wind ranges from about 9 mph on the calmest days to 10 mph at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (mph)Feels
19light breeze
29light breeze
39light breeze
49light breeze
59light breeze
69light breeze
79light breeze
89light breeze
99light breeze
109light breeze
119light breeze
129light breeze
139light breeze
149light breeze
159light breeze
169light breeze
179light breeze
189light breeze
199light breeze
209light breeze
219light breeze
229light breeze
239light breeze
249light breeze
259light breeze
269light breeze
279light breeze
2810light breeze
2910light breeze
3010light breeze

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 5:13 AM to 5:45 AM, and sunset from 6:13 PM to 5:21 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.05:136:13
213.05:146:11
312.95:156:09
412.95:166:08
512.85:176:06
612.85:186:04
712.75:196:02
812.75:216:00
912.65:225:59
1012.65:235:57
1112.55:245:55
1212.55:255:53
1312.45:265:51
1412.45:275:50
1512.35:285:48
1612.35:295:46
1712.25:305:44
1812.25:315:42
1912.15:325:40
2012.15:345:39
2112.05:355:37
2212.05:365:35
2311.95:375:33
2411.95:385:31
2511.85:395:30
2611.85:405:28
2711.75:415:26
2811.75:425:24
2911.65:435:22
3011.65:455:21

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.27 kWh/m².

For context, solar energy here swings from a low near 1.6 kWh/m² to a high of 6.13 kWh/m² in July across the year — September's 4.27 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.9Bright
24.9Bright
34.8Bright
44.8Bright
54.8Bright
64.7Bright
74.7Bright
84.6Bright
94.6Bright
104.5Bright
114.5Bright
124.4Bright
134.4Bright
144.3Bright
154.3Bright
164.3Bright
174.2Bright
184.2Bright
194.1Bright
204.1Bright
214.0Bright
224.0Bright
234.0Moderate
243.9Moderate
253.9Moderate
263.8Moderate
273.8Moderate
283.7Moderate
293.7Moderate
303.6Moderate
Planning a trip in September

Hazard calendar for Hanover

In seasonPeak

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

Hanover 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 Hanover?

Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

6.8
Sightseeing
3rd-best month of the year
4.1
Beach & pool
4th-best month of the year

September is a reasonable time to visit Hanover for sightseeing.

What to pack for Hanover in September

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

In September, Hanover sees daytime highs around 70°F and nights near 59°F. Worth packing: rain gear. About 8 days see rain.

rain gear

Sea temperature near Hanover 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 9 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
Oct57Bracing
Nov51Bracing
Dec46Bracing

UV index in Hanover 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 Hanover peaks around July 10 at about 8 (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 8Dec 23UV 1
UV index (midday)Level
Jan1Low
Feb3Moderate
Mar4Moderate
Apr5High
May7Very high
Jun8Very high
Jul8Very high
Aug5Moderate
Sep6High
Oct3Moderate
Nov2Moderate
Dec1Low
Location & terrain

Where is Hanover?

Hanover sits at 42.1°N, 70.8°W, 52 ft above sea level, in United States. The nearest listed city is Rockland, 5.6 mi away.

Topography around Hanover

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

Within 2 miles, the terrain around Hanover has only modest variations in elevation — a maximum elevation change of 240 ft around an average of 89 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 302 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 935 ft.

The land around Hanover is covered by trees (85%) within 2 miles, trees (69%) within 10 miles, and trees (47%) and water (45%) within 50 miles.

2 miles
240 ft
10 miles
302 ft
50 miles
935 ft
treesgrasslandartificial surfaceswaterwetland
September weather nearby: Rockland 5.6 mi · Abington 6.8 mi · Duxbury 8.7 mi · Weymouth 9.9 mi · Brockton 11 mi · Braintree 12 mi · Randolph 12 mi · Quincy 14 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 Hanover (42.1132°, -70.812°, elevation 52 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. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).