Fairhaven weather in September

In September, Fairhaven sees average daytime highs of 72°F and overnight lows near 58°F, with 3.5 in of rain across 8.4 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 76°F in the first days to 68°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 Fairhaven's 2nd-clearest and 10th-windiest month. For the whole year in context, see Fairhaven's year-round climate.

Daytime high
72°
4th warmest
Overnight low
58°
9th coldest
Rainfall
3.5 in
8.4 wet days
Daylight
12 h 18 min
5:30 AM – 5:46 PM
Cloud cover
54%
2nd clearest
Wind
7 mph
10th windiest
Solar energy
4.23 kWh/m²
Travel score
7.0
out of 10

Fairhaven is town in Bristol County, Massachusetts, United States.

Founded
1659

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 76°F in the first days to 68°F by the end.

A typical September day in Fairhaven reaches about 72°F in the afternoon and slips back to 58°F overnight — a 14°F spread between the day's warmth and the night's chill. On most days the high lands between 65°F and 80°F. Set against its neighbours, September runs about 7°F cooler than August and about 10°F warmer than October.

40°50°60°70°80°151015202530
Avg high (°F)Avg low (°F)
17762
27662
37662
47662
57661
67561
77561
87560
97460
107460
117460
127459
137359
147359
157358
167258
177258
187257
197157
207157
217156
227056
237056
247056
256955
266955
276955
286854
296854
306853

How September really feels in Fairhaven

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.

Fairhaven 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
Jan38° / 25°3.79.94.79.30.0
Feb39° / 26°3.29.14.510.30.0
Mar46° / 32°4.410.64.111.71.2
Apr56° / 42°3.810.80.713.13.7
May65° / 50°3.110.8014.35.7
Jun75° / 60°3.39.10156.8
Jul81° / 66°2.99.6014.76.6
Aug79° / 65°3.49.5013.76.8
Sep72° / 58°3.58.4012.37.0
Oct62° / 48°4.19.30.110.95.5
Nov52° / 38°3.78.90.59.72.8
Dec43° / 30°4.310.73.390.5

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 37% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 15% of September, with mostly cloudy or overcast conditions the remaining 48%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15644
25545
35545
45545
55545
65446
75446
85347
95446
105347
115347
125248
135248
145248
155149
165149
175149
185149
195050
204951
214951
225050
235050
245149
255149
265248
275149
285248
295248
305347

Chance of precipitation in September

Any precipitation

Fairhaven gets around 3.5 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 (%)
127
227
327
427
527
627
727
827
927
1027
1127
1227
1327
1427
1527
1627
1727
1827
1927
2027
2128
2228
2329
2429
2529
2630
2730
2830
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 38% of days. Sticky, muggy-or-worse air turns up on roughly 19% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1202725208
2212724208
3222724198
4232724198
5242723187
6262623187
7272622186
8292622186
9302522185
10312522185
11332421175
12342421174
13362320174
14372320173
15382320163
16402319162
17412318162
18422318162
19432317151
20442317151
21452316151
22462316141
23472315131
24482315131
25502314121
26512314111
27532313101
28542213101
2955221391
3058221280

Wind in September

Winds average 7 mph in September.

Across September, daily wind ranges from about 7 mph on the calmest days to 8 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (mph)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277light breeze
287light breeze
298light breeze
308light 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 5:14 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)
113.05:146:13
212.95:156:11
312.95:166:09
412.85:176:08
512.85:186:06
612.75:196:04
712.75:206:02
812.75:216:01
912.65:225:59
1012.65:235:57
1112.55:245:55
1212.55:255:53
1312.45:275:52
1412.45:285:50
1512.35:295:48
1612.35:305:46
1712.25:315:44
1812.25:325:43
1912.15:335:41
2012.15:345:39
2112.05:355:37
2212.05:365:35
2311.95:375:34
2411.95:385:32
2511.85:395:30
2611.85:405:28
2711.75:415:26
2811.75:435:25
2911.75:445:23
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 4.23 kWh/m².

For context, solar energy here swings from a low near 1.65 kWh/m² to a high of 6.05 kWh/m² in June across the year — September's 4.23 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.9Bright
24.8Bright
34.8Bright
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
184.1Bright
194.1Bright
204.1Bright
214.0Bright
224.0Moderate
233.9Moderate
243.9Moderate
253.8Moderate
263.8Moderate
273.8Moderate
283.7Moderate
293.7Moderate
303.6Moderate
Planning a trip in September

Hazard calendar for Fairhaven

In seasonPeak

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

Fairhaven 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 Fairhaven?

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
5.1
Beach & pool
4th-best month of the year

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

What to pack for Fairhaven in September

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

In September, Fairhaven sees daytime highs around 72°F and nights near 58°F. Worth packing: light clothes and rain gear. About 8 days see rain.

light clothesrain gear

Sea temperature near Fairhaven in September

The nearest coast averages about 67°F in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea offshore is warmest in August at about 70°F and coldest in February near 37°F.

It's comfortable for a long swim from Jul 16 to Sep 8 — about 1.8 months when the water holds above 68°F.

30°40°50°60°70°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°F)Comfort
Jan41Bracing
Feb37Bracing
Mar38Bracing
Apr44Bracing
May53Bracing
Jun61Cool
Jul68Refreshing
Aug70Refreshing
Sep67Cool
Oct62Cool
Nov54Bracing
Dec47Bracing

UV index in Fairhaven 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 Fairhaven peaks around June 23 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 9 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighModerateLowJun 23UV 8Dec 23UV 1
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar4Moderate
Apr5High
May7Very high
Jun8Very high
Jul8Very high
Aug5Moderate
Sep6High
Oct3Moderate
Nov2Moderate
Dec1Low

Air quality in Fairhaven 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 Fairhaven is worst in July — around 16 µg/m³ PM2.5 (moderate), about 1.9× the cleanest month (November, 8 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1516 µg/m³Nov 189 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb13Moderate
Mar14Moderate
Apr14Moderate
May15Moderate
Jun15Moderate
Jul16Moderate
Aug14Moderate
Sep12Good
Oct10Good
Nov8Good
Dec10Good
Location & terrain

Where is Fairhaven?

Fairhaven sits at 41.6°N, 70.9°W, 20 ft above sea level, in United States. The nearest listed city is New Bedford, 1.2 mi away.

Topography around Fairhaven

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

Within 2 miles, the terrain around Fairhaven has only modest variations in elevation — a maximum elevation change of 151 ft around an average of 33 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 600 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 1,076 ft.

The land around Fairhaven is covered by artificial surfaces (34%), water (28%) and trees (24%) within 2 miles, trees (49%) and water (35%) within 10 miles, and water (55%) and trees (38%) within 50 miles.

2 miles
151 ft
10 miles
600 ft
50 miles
1,076 ft
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
September weather nearby: New Bedford 1.2 mi · Fall River 14 mi · Somerset 15 mi · Swansea 17 mi · Middleborough 17 mi · Portsmouth 18 mi · Bristol 19 mi · Taunton 21 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 Fairhaven (41.6376°, -70.9036°, 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).