Port Antonio weather in September

In September, Port Antonio sees average daytime highs of 28°C and overnight lows near 25°C, with 131 mm of rain across 21.4 wet days and about 12.1 hours of daylight. It is the 2nd-warmest and 4th-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 25% of the time in September, and the air most often feels oppressive.

Daylight stretches from about 12 h 24 min at the start of September to 11 h 54 min by month's end. Set against the rest of the year, September is Port Antonio's 10th-clearest and 11th-windiest month. For the whole year in context, see Port Antonio's year-round climate.

Daytime high
28°
2nd warmest
Overnight low
25°
11th coldest
Rainfall
131 mm
21.4 wet days
Daylight
12 h 06 min
5:57 AM – 6:03 PM
Cloud cover
62%
10th clearest
Wind
11 km/h
11th windiest
Solar energy
6 kWh/m²
Travel score
4.2
out of 10

Port Antonio is town of the parish of Portland, Jamaica.

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 Port Antonio reaches about 28°C in the afternoon and slips back to 25°C overnight — a 3°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.

20°23°25°28°30°151015202530
Avg high (°C)Avg low (°C)
12925
22925
32925
42925
52925
62925
72925
82925
92925
102925
112925
122925
132925
142925
152925
162925
172925
182925
192825
202825
212825
222825
232825
242825
252825
262825
272825
282825
292825
302825

How September really feels in Port Antonio

Once humidity and wind are folded in, September averages 28 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
28
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.

Port Antonio weather by month

How September compares with the rest of the year at a glance. September is the 2nd-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan25° / 23°9820115.6
Feb25° / 22°651711.45.8
Mar25° / 23°871811.95.9
Apr26° / 23°761712.45.7
May27° / 24°13821.312.84.9
Jun28° / 25°9616.713.15.2
Jul28° / 25°8317.1135.1
Aug29° / 25°10219.912.64.5
Sep28° / 25°13121.412.14.2
Oct28° / 25°18324.711.64.2
Nov27° / 24°1562211.14.7
Dec26° / 23°12320.510.95.3

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 25% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 20% of September, with mostly cloudy or overcast conditions the remaining 55%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14753
24753
34852
44951
54951
64951
74951
84951
94951
104951
114852
124852
134852
144852
154753
164654
174654
184555
194555
204456
214456
224357
234159
244060
253961
263862
273763
283862
293763
303664

Chance of precipitation in September

Any precipitation

Port Antonio gets around 131 mm of rain over 21.4 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 72% and peaks near 79% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%151015202530
Rain chance (%)
168
267
367
467
566
666
766
867
967
1068
1169
1269
1370
1470
1571
1671
1772
1873
1973
2074
2175
2276
2376
2477
2577
2678
2778
2878
2979
3079

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 65% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Oppressive (%)Miserable (%)
16040
26139
36139
46238
56238
66238
76337
86337
96337
106436
116436
126436
136535
146535
156535
166535
176535
186535
196535
206535
216535
226634
236634
246634
256733
266733
276733
286733
296832
306832

Wind in September

Winds average 11 km/h in September.

Across September, daily wind ranges from about 11 km/h on the calmest days to 11 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
111calm
211calm
311calm
411calm
511calm
611calm
711calm
811calm
911calm
1011calm
1111calm
1211calm
1311calm
1411calm
1511calm
1611calm
1711calm
1811calm
1911calm
2011calm
2111calm
2211calm
2311calm
2411calm
2511calm
2611calm
2711calm
2811calm
2911calm
3011calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 24 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 30 minutes over September. Sunrise moves from 5:55 AM to 5:59 AM, and sunset from 6:16 PM to 5:51 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.45:556:16
212.35:556:16
312.35:556:15
412.35:556:14
512.35:556:13
612.35:566:12
712.35:566:11
812.25:566:10
912.25:566:09
1012.25:566:09
1112.25:566:08
1212.25:566:07
1312.25:576:06
1412.15:576:05
1512.15:576:04
1612.15:576:03
1712.15:576:02
1812.15:576:01
1912.05:586:00
2012.05:586:00
2112.05:585:59
2212.05:585:58
2312.05:585:57
2412.05:585:56
2511.95:595:55
2611.95:595:54
2711.95:595:53
2811.95:595:52
2911.95:595:52
3011.95:595:51

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 6 kWh/m².

For context, solar energy here swings from a low near 4.42 kWh/m² to a high of 6.79 kWh/m² in July across the year — September's 6 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
16.3Intense
26.3Intense
36.3Intense
46.3Intense
56.3Intense
66.2Intense
76.2Intense
86.2Intense
96.2Intense
106.2Intense
116.2Intense
126.1Intense
136.1Intense
146.1Intense
156.0Intense
166.0Intense
176.0Bright
185.9Bright
195.9Bright
205.9Bright
215.8Bright
225.8Bright
235.8Bright
245.7Bright
255.7Bright
265.6Bright
275.6Bright
285.5Bright
295.5Bright
305.5Bright
Planning a trip in September

Hazard calendar for Port Antonio

In seasonPeak

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

Port Antonio 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 Port Antonio?

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

4.2
Sightseeing
11th-best month of the year
5.0
Beach & pool
10th-best month of the year

September is a reasonable time to visit Port Antonio for sightseeing.

What to pack for Port Antonio in September

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

In September, Port Antonio sees daytime highs around 28°C and nights near 25°C. Pack light clothes, rain gear and sun protection. About 21 days see rain.

light clothesrain gearsun protection

Sea temperature near Port Antonio 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 offshore is warmest in September at about 29°C and coldest in February near 27°C.

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

26°28°30°JanFebMarAprMayJunJulAugSepOctNovDecwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan27Warm
Feb27Warm
Mar27Warm
Apr27Warm
May28Warm
Jun28Tropical
Jul29Tropical
Aug29Tropical
Sep29Tropical
Oct29Tropical
Nov29Tropical
Dec28Warm

UV index in Port Antonio 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 Port Antonio peaks around April 18 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 highApr 18UV 13Dec 15UV 7
UV index (midday)Level
Jan8Very high
Feb10Extreme
Mar12Extreme
Apr13Extreme
May12Extreme
Jun13Extreme
Jul11Extreme
Aug12Extreme
Sep12Extreme
Oct11Extreme
Nov8Very high
Dec7Very high

Air quality in Port Antonio 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 Port Antonio is worst in June — around 32 µg/m³ PM2.5 (moderate), about 4.2× the cleanest month (December, 8 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJun 2332 µg/m³Dec 198 µg/m³
PM2.5 (µg/m³)Level
Jan8Good
Feb10Good
Mar10Good
Apr12Good
May19Moderate
Jun32Moderate
Jul31Moderate
Aug25Moderate
Sep17Moderate
Oct14Moderate
Nov9Good
Dec8Good
Location & terrain

Where is Port Antonio?

Port Antonio sits at 18.2°N, 76.5°W, 0 m above sea level, in Jamaica. The nearest listed city is Morant Bay, 33 km away.

Morant BayNew KingstonHalf Way TreeKingstonPort RoyalPortmoreSpanish TownLinstead

Topography around Port Antonio

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

Within 3 km, the terrain around Port Antonio has significant variations in elevation — a maximum elevation change of 309 m around an average of 57 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,458 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,224 m.

The land around Port Antonio is covered by trees (59%) and water (36%) within 3 km, trees (51%) and water (48%) within 16 km, and water (68%) and trees (28%) within 80 km.

3 km
309 m
16 km
1,458 m
80 km
2,224 m
treesgrasslandartificial surfaceswater
September weather nearby: Morant Bay 33 km · New Kingston 40 km · Half Way Tree 41 km · Kingston 41 km · Port Royal 49 km · Portmore 51 km · Spanish Town 57 km · Linstead 61 km

Jamaica travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type A / B
110 V · 50 Hz
Prices
≈ 60% of US
price level, 2025
GDP per capita
$8,003
2025
Happiness
6.3 / 10
World Happiness, 2025
Homicide rate
49.4
per 100k, 2023
Road deaths
15.1
per 100k/yr, 2019
Income group
Upper middle
World Bank
Religion
Protestant 65%none 21%other 7%Roman Catholic 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 Port Antonio (18.1789°, -76.4522°, elevation 0 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).