Plymouth weather in September

In September, Plymouth sees average daytime highs of 28°C and overnight lows near 26°C, with 116 mm of rain across 17.2 wet days and about 12.1 hours of daylight. It is the 1st-warmest and 2nd-wettest month of the year here.

Day-to-day highs hold fairly steady near 28°C through the month. The sky is clear or mostly clear about 39% of the time in September, and the air most often feels oppressive.

Daylight stretches from about 12 h 18 min at the start of September to 11 h 54 min by month's end. Set against the rest of the year, September is Plymouth's 12th-clearest and 11th-windiest month. For the whole year in context, see Plymouth's year-round climate.

Daytime high
28°
1st warmest
Overnight low
26°
12th coldest
Rainfall
116 mm
17.2 wet days
Daylight
12 h 06 min
6:00 AM – 6:06 PM
Cloud cover
58%
12th clearest
Wind
22 km/h
11th windiest
Solar energy
6.03 kWh/m²
Travel score
5.1
out of 10

Plymouth is de jure capital of Montserrat, West Indies, now a ghost town.

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 28°C through the month.

A typical September day in Plymouth reaches about 28°C in the afternoon and slips back to 26°C overnight — a 2°C spread between the day's warmth and the night's chill. On most days the high lands between 27°C and 29°C. Set against its neighbours, September runs on par with August and on par with October.

24°26°28°30°32°151015202530
Avg high (°C)Avg low (°C)
12827
22827
32827
42827
52827
62827
72827
82827
92826
102826
112826
122826
132826
142826
152826
162826
172826
182826
192826
202826
212826
222826
232826
242826
252826
262826
272826
282826
292826
302826

How September really feels in Plymouth

Once humidity and wind are folded in, September averages 17 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
17
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

The story in September is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Plymouth weather by month

How September compares with the rest of the year at a glance. September is the 1st-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan26° / 24°3511.711.17.1
Feb25° / 24°227.811.47.6
Mar26° / 24°197.211.97.8
Apr26° / 25°308.312.47.3
May27° / 26°5410.712.86.6
Jun27° / 26°4310.4136.4
Jul28° / 26°7115.312.95.9
Aug28° / 26°8816.612.65.6
Sep28° / 26°11617.212.15.1
Oct28° / 26°12117.711.65.4
Nov27° / 26°9715.911.25.8
Dec26° / 25°6014.7116.4

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 39% of the time in September, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 12% of September, with mostly cloudy or overcast conditions the remaining 49%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15842
25743
35743
45743
55743
65545
75545
85446
95446
105248
115248
125149
134951
145050
154951
164852
174852
184753
194852
204753
214753
224753
234753
244753
254753
264852
274852
284852
294951
304951

Chance of precipitation in September

Any precipitation

Plymouth gets around 116 mm of rain over 17.2 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 57% and peaks near 60% on the wettest days.

0%20%40%60%151015202530
Rain chance (%)
153
253
354
454
554
654
755
855
955
1056
1156
1257
1357
1457
1557
1658
1758
1858
1958
2058
2159
2259
2359
2459
2560
2660
2760
2859
2959
3059

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

Most of September feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, September lands in the oppressive band about 53% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Oppressive (%)Miserable (%)
14753
24753
34753
44753
54753
64753
74753
84753
94852
104852
114951
125050
135149
145149
155248
165347
175446
185545
195545
205644
215743
225743
235743
245842
255842
265842
275941
285941
296040
306040

Wind in September

Winds average 22 km/h in September.

Across September, daily wind ranges from about 22 km/h on the calmest days to 24 km/h at its breeziest. It stays fairly steady from day to day.

0102030151015202530
Wind speed (km/h)Feels
124breezy
224breezy
324breezy
423breezy
523breezy
623breezy
723breezy
823breezy
923breezy
1023breezy
1123breezy
1223breezy
1323breezy
1423breezy
1523breezy
1623breezy
1723breezy
1822breezy
1922breezy
2022breezy
2122breezy
2222breezy
2322breezy
2422breezy
2522breezy
2622breezy
2722breezy
2822breezy
2922breezy
3022breezy

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 18 min at the start of September to 11 h 54 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 24 minutes over September. Sunrise moves from 5:59 AM to 6:02 AM, and sunset from 6:18 PM to 5:54 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.35:596:18
212.35:596:18
312.35:596:17
412.35:596:16
512.35:596:15
612.35:596:14
712.25:596:14
812.26:006:13
912.26:006:12
1012.26:006:11
1112.26:006:10
1212.26:006:09
1312.16:006:09
1412.16:006:08
1512.16:006:07
1612.16:006:06
1712.16:016:05
1812.16:016:04
1912.06:016:03
2012.06:016:03
2112.06:016:02
2212.06:016:01
2312.06:016:00
2412.06:015:59
2511.96:015:58
2611.96:025:57
2711.96:025:57
2811.96:025:56
2911.96:025:55
3011.96:025:54

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 6.03 kWh/m².

For context, solar energy here swings from a low near 4.68 kWh/m² to a high of 6.77 kWh/m² in April across the year — September's 6.03 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
16.3Intense
26.3Intense
36.3Intense
46.2Intense
56.2Intense
66.2Intense
76.2Intense
86.2Intense
96.2Intense
106.1Intense
116.1Intense
126.1Intense
136.1Intense
146.1Intense
156.0Intense
166.0Intense
176.0Intense
186.0Bright
196.0Bright
205.9Bright
215.9Bright
225.9Bright
235.9Bright
245.9Bright
255.8Bright
265.8Bright
275.8Bright
285.8Bright
295.8Bright
305.8Bright
Planning a trip in September

Hazard calendar for Plymouth

In seasonPeak

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

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

Plymouth's rainy season runs July–December, when most of the year's rain falls.

Plymouth sees seasonal dust haze (June–July), heaviest in July.

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

Is September a good time to visit Plymouth?

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

5.1
Sightseeing
12th-best month of the year
5.7
Beach & pool
11th-best month of the year

September is a reasonable time to visit Plymouth for sightseeing.

What to pack for Plymouth in September

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

In September, Plymouth sees daytime highs around 28°C and nights near 26°C. Pack light clothes, rain gear and sun protection. Worth having: a windbreaker. About 17 days see rain.

light clothesrain gearsun protectiona windbreaker

Sea temperature near Plymouth in September

The nearest coast averages about 29°C 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 13 km away) is warmest in September at about 29°C and coldest in February near 26°C.

The water stays above 20°C all year — warm enough for a swim any month.

24°26°28°30°JanFebMarAprMayJunJulAugSepOctNovDecwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan27Warm
Feb26Warm
Mar26Warm
Apr27Warm
May28Warm
Jun28Warm
Jul28Tropical
Aug29Tropical
Sep29Tropical
Oct29Tropical
Nov28Tropical
Dec28Warm

UV index in Plymouth in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 12 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Plymouth peaks around March 24 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 15 at about 7 (very high).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecVery highExtremeVery highMar 24UV 13Dec 15UV 7
UV index (midday)Level
Jan9Very high
Feb11Extreme
Mar13Extreme
Apr13Extreme
May12Extreme
Jun12Extreme
Jul12Extreme
Aug11Extreme
Sep12Extreme
Oct10Extreme
Nov8Very high
Dec7Very high

Air quality in Plymouth 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 Plymouth is worst in June — around 26 µg/m³ PM2.5 (moderate), about 3.2× the cleanest month (December, 8 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJun 2226 µg/m³Dec 238 µg/m³
PM2.5 (µg/m³)Level
Jan8Good
Feb11Good
Mar10Good
Apr12Moderate
May16Moderate
Jun26Moderate
Jul25Moderate
Aug22Moderate
Sep17Moderate
Oct18Moderate
Nov11Good
Dec8Good
Location & terrain

Where is Plymouth?

Plymouth sits at 16.7°N, 62.2°W, 77 m above sea level, in Montserrat. The nearest listed city is Brades, 10 km away.

Brades

Topography around Plymouth

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Plymouth.

Within 3 km, the terrain around Plymouth has large variations in elevation — a maximum elevation change of 805 m around an average of 118 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,037 m; within 80 km, large variations in elevation — a maximum elevation change of 1,012 m.

The land around Plymouth is covered by trees (43%) and water (36%) within 3 km, water (88%) within 16 km, and water (94%) within 80 km.

3 km
805 m
16 km
1,037 m
80 km
1,012 m
treesshrubsgrasslandartificial surfacesbare terrainwater
September weather nearby: Brades 10 km · Falmouth 58 km · English Harbour 59 km · St. John's 61 km · Sainte-Rose 69 km · Baie-Mahault 83 km · Basseterre 85 km · Petit-Bourg 88 km

Montserrat travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type A / B
230 V · 60 Hz
Religion
Protestant 71%Roman Catholic 11%none 8%other/not stated 5%

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 Plymouth (16.7055°, -62.2129°, elevation 77 m), 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).