Port Royal weather in September

In September, Port Royal sees average daytime highs of 29°C and overnight lows near 25°C, with 128 mm of rain across 18.3 wet days and about 12.1 hours of daylight. It is the 3rd-warmest and 2nd-wettest month of the year here.

Day-to-day highs hold fairly steady near 29°C through the month. The sky is clear or mostly clear about 26% 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 Royal's 11th-clearest and 10th-windiest month. For the whole year in context, see Port Royal's year-round climate.

Daytime high
29°
3rd warmest
Overnight low
25°
10th coldest
Rainfall
128 mm
18.3 wet days
Daylight
12 h 06 min
5:59 AM – 6:05 PM
Cloud cover
62%
11th clearest
Wind
11 km/h
10th windiest
Solar energy
5.91 kWh/m²
Travel score
4.4
out of 10

Port Royal is settlement in Jamaica.

Founded
1494

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 29°C through the month.

A typical September day in Port Royal reaches about 29°C in the afternoon and slips back to 25°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between 28°C and 30°C. Set against its neighbours, September runs on par with August and about 1°C warmer than October.

20°25°30°35°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
192925
202925
212925
222925
232925
242925
252925
262925
272925
282925
292925
302925

How September really feels in Port Royal

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 Royal weather by month

How September compares with the rest of the year at a glance. September is the 3rd-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan26° / 22°277.9117.4
Feb26° / 22°217.111.47.5
Mar26° / 22°337.911.97.3
Apr27° / 23°35912.46.9
May28° / 24°9514.112.85.8
Jun29° / 25°7511.613.15.4
Jul29° / 25°5610.5135.4
Aug29° / 25°851412.64.9
Sep29° / 25°12818.312.14.4
Oct28° / 24°15321.711.64.4
Nov27° / 24°8113.311.26.0
Dec27° / 23°439.610.96.9

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 26% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 19% of September, with mostly cloudy or overcast conditions the remaining 54%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14654
24852
34852
44852
55050
65050
75050
85050
95050
105050
115050
125050
135050
144852
154753
164753
174753
184654
194555
204555
214357
224357
234258
244258
254060
264060
274060
283961
293862
303862

Chance of precipitation in September

Any precipitation

Port Royal gets around 128 mm of rain over 18.3 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 62% and peaks near 70% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%151015202530
Rain chance (%)
155
255
355
455
555
655
755
856
957
1057
1158
1259
1360
1461
1561
1662
1763
1863
1964
2065
2165
2266
2367
2467
2568
2668
2769
2869
2969
3070

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 89% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Oppressive (%)Miserable (%)
18812
28713
38713
48713
58713
68713
78713
88713
98713
108713
118713
128812
138812
148911
158911
168911
179010
189010
199010
20919
21919
22919
23919
24928
25928
26928
27928
28928
29928
30928

Wind in September

Winds average 11 km/h in September.

Across September, daily wind ranges from about 10 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
1410calm
1510calm
1610calm
1710calm
1810calm
1910calm
2010calm
2110calm
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 5:56 AM to 6:01 AM, and sunset from 6:18 PM to 5:52 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.45:566:18
212.35:576:17
312.35:576:16
412.35:576:15
512.35:576:14
612.35:576:14
712.35:576:13
812.25:576:12
912.25:586:11
1012.25:586:10
1112.25:586:09
1212.25:586:08
1312.25:586:07
1412.15:586:06
1512.15:596:06
1612.15:596:05
1712.15:596:04
1812.15:596:03
1912.05:596:02
2012.05:596:01
2112.05:596:00
2212.06:005:59
2312.06:005:58
2412.06:005:58
2511.96:005:57
2611.96:005:56
2711.96:005:55
2811.96:015:54
2911.96:015:53
3011.96:015:52

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.91 kWh/m².

For context, solar energy here swings from a low near 4.46 kWh/m² to a high of 6.73 kWh/m² in July across the year — September's 5.91 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
16.2Intense
26.2Intense
36.2Intense
46.2Intense
56.2Intense
66.2Intense
76.2Intense
86.1Intense
96.1Intense
106.1Intense
116.1Intense
126.0Intense
136.0Intense
146.0Intense
156.0Bright
165.9Bright
175.9Bright
185.9Bright
195.8Bright
205.8Bright
215.7Bright
225.7Bright
235.7Bright
245.6Bright
255.6Bright
265.5Bright
275.5Bright
285.4Bright
295.4Bright
305.4Bright
Planning a trip in September

Hazard calendar for Port Royal

In seasonPeak

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

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

Port Royal's rainy season runs August–November, when most of the year's rain falls.

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

Is September a good time to visit Port Royal?

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

4.4
Sightseeing
11th-best month of the year
5.6
Beach & pool
11th-best month of the year

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

What to pack for Port Royal in September

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

In September, Port Royal sees daytime highs around 29°C and nights near 25°C. Pack light clothes and rain gear. Worth having: sun protection. About 18 days see rain.

light clothesrain gearsun protection

Sea temperature near Port Royal 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
Apr28Warm
May28Tropical
Jun28Tropical
Jul29Tropical
Aug29Tropical
Sep29Tropical
Oct29Tropical
Nov29Tropical
Dec28Tropical

UV index in Port Royal 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 Royal peaks around April 19 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 16 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 19UV 12Dec 16UV 7
UV index (midday)Level
Jan8Very high
Feb10Extreme
Mar12Extreme
Apr13Extreme
May12Extreme
Jun13Extreme
Jul11Extreme
Aug12Extreme
Sep12Extreme
Oct11Extreme
Nov8Very high
Dec7Very high

Air quality in Port Royal 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 Royal 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 Royal?

Port Royal sits at 17.9°N, 76.8°W, 0 m above sea level, in Jamaica. The nearest listed city is Portmore, 6.0 km away.

Spanish TownOld HarbourLinsteadMay Pen

Topography around Port Royal

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

Within 3 km, the terrain around Port Royal has only modest variations in elevation — a maximum elevation change of 6 m around an average of 0 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 767 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,229 m.

The land around Port Royal is covered by water (94%) within 3 km, water (46%) and trees (29%) within 16 km, and water (59%) and trees (34%) within 80 km.

3 km
6 m
16 km
767 m
80 km
2,229 m
treesgrasslandcroplandartificial surfaceswatermangroves
September weather nearby: Portmore 6.0 km · Kingston 8.0 km · Half Way Tree 9.0 km · New Kingston 10 km · Spanish Town 14 km · Old Harbour 28 km · Linstead 30 km · May Pen 43 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 Royal (17.9374°, -76.8406°, 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).