Provincetown weather in September

In September, Provincetown sees average daytime highs of 66°F and overnight lows near 62°F, with 3.7 in of rain across 7.9 wet days and about 12.3 hours of daylight. It is the 3rd-warmest and 7th-wettest month of the year here.

Highs ease over the month, from about 68°F in the first days to 63°F by the end. The sky is clear or mostly clear about 44% 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 Provincetown's 1st-clearest and 9th-windiest month. For the whole year in context, see Provincetown's year-round climate.

Daytime high
66°
3rd warmest
Overnight low
62°
10th coldest
Rainfall
3.7 in
7.9 wet days
Daylight
12 h 18 min
5:27 AM – 5:43 PM
Cloud cover
50%
1st clearest
Wind
13 mph
9th windiest
Solar energy
4.45 kWh/m²
Travel score
6.5
out of 10

Provincetown is town on Cape Cod in Massachusetts, United States.

Founded
1700

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 68°F in the first days to 63°F by the end.

A typical September day in Provincetown reaches about 66°F in the afternoon and slips back to 62°F overnight — a 4°F spread between the day's warmth and the night's chill. On most days the high lands between 62°F and 70°F. Set against its neighbours, September runs about 5°F cooler than August and about 7°F warmer than October.

50°60°70°80°151015202530
Avg high (°F)Avg low (°F)
16965
26965
36865
46864
56864
66864
76864
86764
96764
106763
116763
126763
136763
146662
156662
166662
176662
186562
196561
206561
216561
226561
236460
246460
256460
266460
276459
286359
296359
306358

How September really feels in Provincetown

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.

Provincetown weather by month

How September compares with the rest of the year at a glance. September is the 3rd-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan38° / 30°4.311.86.19.30.0
Feb38° / 30°3.710.24.910.30.0
Mar41° / 34°4.611.14.111.70.1
Apr47° / 42°4.211.10.713.11.4
May54° / 50°3.510.6014.33.4
Jun63° / 59°3.180155.8
Jul70° / 66°2.47.5014.77.0
Aug70° / 67°2.87.4013.77.1
Sep66° / 62°3.77.9012.36.5
Oct58° / 53°4.89.9010.94.5
Nov50° / 44°4.39.80.59.62.4
Dec43° / 36°4.711.63.390.6

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 44% of the time in September, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 13% of September, with mostly cloudy or overcast conditions the remaining 43%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
16040
25941
35941
45941
55842
65842
75842
85941
95842
105842
115743
125842
135842
145743
155743
165743
175743
185644
195644
205545
215545
225545
235446
245545
255446
265446
275446
285446
295545
305446

Chance of precipitation in September

Any precipitation

Provincetown gets around 3.7 in of rain over 7.9 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 26% and peaks near 31% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%151015202530
Rain chance (%)
124
224
324
424
524
624
724
824
924
1024
1124
1224
1324
1424
1524
1624
1725
1825
1926
2026
2127
2228
2328
2429
2529
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 31% 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 (%)
1132637231
2142637221
3152636211
4162736211
5182735201
6192735191
7202734181
8222734161
9232734151
10242734140
11262734130
12272733120
13292733110
14302733100
1531273290
1632273280
1734283180
1835283070
1936283070
2037282960
2138282860
2239282760
2340292660
2441292450
2543292350
2644292250
2746292140
2847291940
2949291840
3051291640

Wind in September

Winds average 13 mph in September.

Across September, daily wind ranges from about 13 mph on the calmest days to 14 mph at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (mph)Feels
113breezy
213breezy
313breezy
413breezy
513breezy
613breezy
713breezy
813breezy
913breezy
1013breezy
1113breezy
1213breezy
1313breezy
1413breezy
1513breezy
1613breezy
1713breezy
1813breezy
1914breezy
2014breezy
2114breezy
2214breezy
2314breezy
2414breezy
2514breezy
2614breezy
2714breezy
2814breezy
2914breezy
3014breezy

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 5:11 AM to 5:42 AM, and sunset from 6:10 PM to 5:18 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.05:116:10
212.95:126:09
312.95:136:07
412.95:146:05
512.85:156:03
612.85:166:02
712.75:176:00
812.75:185:58
912.65:195:56
1012.65:205:54
1112.55:215:53
1212.55:225:51
1312.45:235:49
1412.45:255:47
1512.35:265:45
1612.35:275:43
1712.25:285:42
1812.25:295:40
1912.15:305:38
2012.15:315:36
2112.05:325:34
2212.05:335:32
2311.95:345:31
2411.95:355:29
2511.85:375:27
2611.85:385:25
2711.75:395:23
2811.75:405:22
2911.65:415:20
3011.65:425:18

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.45 kWh/m².

For context, solar energy here swings from a low near 1.55 kWh/m² to a high of 6.43 kWh/m² in July across the year — September's 4.45 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.2Bright
25.1Bright
35.0Bright
45.0Bright
55.0Bright
64.9Bright
74.9Bright
84.8Bright
94.8Bright
104.7Bright
114.7Bright
124.6Bright
134.6Bright
144.5Bright
154.5Bright
164.5Bright
174.4Bright
184.3Bright
194.3Bright
204.3Bright
214.2Bright
224.2Bright
234.1Bright
244.1Bright
254.0Bright
264.0Moderate
273.9Moderate
283.9Moderate
293.8Moderate
303.8Moderate
Planning a trip in September

Hazard calendar for Provincetown

In seasonPeak

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

Provincetown 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 Provincetown?

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

6.5
Sightseeing
3rd-best month of the year
2.7
Beach & pool
3rd-best month of the year

September is a reasonable time to visit Provincetown for sightseeing.

What to pack for Provincetown in September

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

In September, Provincetown sees daytime highs around 66°F and nights near 62°F. Worth packing: a windbreaker. About 8 days see rain.

a windbreaker

Sea temperature near Provincetown 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 offshore is warmest in August at about 67°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
Jun58Bracing
Jul65Cool
Aug67Cool
Sep63Cool
Oct57Bracing
Nov51Bracing
Dec46Bracing

UV index in Provincetown 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 Provincetown peaks around June 21 at about 8 (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 highHighHighModerateLowJun 21UV 8Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb2Moderate
Mar4Moderate
Apr5High
May7Very high
Jun8Very high
Jul8Very high
Aug5Moderate
Sep6High
Oct3Moderate
Nov2Moderate
Dec1Low
Location & terrain

Where is Provincetown?

Provincetown sits at 42.1°N, 70.2°W, 0 ft above sea level, in United States. The nearest listed city is Yarmouth, 24 mi away.

Topography around Provincetown

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

Within 2 miles, the terrain around Provincetown has only modest variations in elevation — a maximum elevation change of 102 ft around an average of 16 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 184 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 846 ft.

The land around Provincetown is covered by water (40%) and trees (25%) within 2 miles, water (90%) within 10 miles, and water (72%) and trees (23%) within 50 miles.

2 miles
102 ft
10 miles
184 ft
50 miles
846 ft
treesgrasslandartificial surfacesbare terrainwaterwetland
September weather nearby: Yarmouth 24 mi · Duxbury 25 mi · Barnstable 25 mi · Hanover 32 mi · Rockland 38 mi · Middleborough 39 mi · Abington 39 mi · Weymouth 40 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 Provincetown (42.053°, -70.1864°, elevation 0 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).