Port of Spain weather in September

In September, Port of Spain sees average daytime highs of 28°C and overnight lows near 26°C, with 102 mm of rain across 20.8 wet days and about 12.1 hours of daylight. It is the 1st-warmest and 6th-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 28% of the time in September, and the air most often feels oppressive.

Daylight stretches from about 12 h 12 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 of Spain's 9th-clearest and 12th-windiest month. For the whole year in context, see Port of Spain's year-round climate.

Daytime high
28°
1st warmest
Overnight low
26°
12th coldest
Rainfall
102 mm
20.8 wet days
Daylight
12 h 06 min
5:59 AM – 6:02 PM
Cloud cover
62%
9th clearest
Wind
17 km/h
12th windiest
Solar energy
5.89 kWh/m²
Travel score
4.4
out of 10

Port of Spain is capital of Trinidad and Tobago.

Air quality
Moderate
PM2.5 13.4 µg/m³ · 2019
Density
4,086/km²
people per km²
Founded
1560

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 of Spain 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)
12826
22826
32826
42826
52826
62826
72826
82826
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 Port of Spain

Once humidity and wind are folded in, September averages 16 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
16
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 of Spain weather by month

How September compares with the rest of the year at a glance. September is the 1st-warmest and 6th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan26° / 25°4610.911.46.9
Feb26° / 25°216.511.67.4
Mar26° / 25°194.711.97.6
Apr27° / 25°234.912.27.2
May27° / 26°469.812.56.4
Jun27° / 25°10319.212.65.0
Jul27° / 25°12524.212.64.5
Aug28° / 26°13525.112.44.3
Sep28° / 26°10220.812.14.4
Oct28° / 26°11121.811.84.6
Nov27° / 26°12422.611.54.6
Dec27° / 25°841711.45.7

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 28% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 17% of September, with mostly cloudy or overcast conditions the remaining 54%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15842
25842
35743
45743
55644
65545
75446
85248
95149
104951
114951
124654
134555
144456
154258
164258
174159
184258
194159
204159
214159
224159
234159
244060
253961
263961
273961
283862
293862
303763

Chance of precipitation in September

Any precipitation

Port of Spain gets around 102 mm of rain over 20.8 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 70% and peaks near 73% on the wettest days.

0%20%40%60%80%151015202530
Rain chance (%)
169
269
370
470
570
671
771
872
972
1072
1173
1273
1373
1473
1572
1672
1771
1871
1970
2069
2168
2268
2367
2467
2566
2666
2766
2866
2966
3067

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 61% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Oppressive (%)Miserable (%)
16733
26733
36634
46535
56535
66436
76436
86337
96337
106238
116238
126238
136139
146139
156139
166139
176139
186040
196040
206040
216040
226040
235941
245941
255941
265941
275941
285842
295842
305842

Wind in September

Winds average 17 km/h in September, the calmest month.

Across September, daily wind ranges from about 17 km/h on the calmest days to 18 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
117light breeze
217light breeze
317light breeze
417light breeze
517light breeze
617light breeze
717light breeze
817light breeze
917light breeze
1017light breeze
1117light breeze
1217light breeze
1317light breeze
1417light breeze
1517light breeze
1617light breeze
1717light breeze
1817light breeze
1917light breeze
2017light breeze
2118light breeze
2218light breeze
2318light breeze
2418light breeze
2518light breeze
2618light breeze
2718light breeze
2818light breeze
2918light breeze
3018light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 12 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 18 minutes over September. Sunrise moves from 6:00 AM to 5:58 AM, and sunset from 6:12 PM to 5:53 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.26:006:12
212.26:006:11
312.25:596:11
412.25:596:10
512.25:596:09
612.25:596:09
712.15:596:08
812.15:596:08
912.15:596:07
1012.15:596:06
1112.15:596:06
1212.15:596:05
1312.15:596:04
1412.15:596:03
1512.15:596:03
1612.15:596:02
1712.05:596:01
1812.05:596:01
1912.05:586:00
2012.05:585:59
2112.05:585:59
2212.05:585:58
2312.05:585:57
2412.05:585:57
2512.05:585:56
2612.05:585:55
2711.95:585:55
2811.95:585:54
2911.95:585:54
3011.95:585:53

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.89 kWh/m².

For context, solar energy here swings from a low near 4.93 kWh/m² to a high of 6.52 kWh/m² in April across the year — September's 5.89 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
16.0Bright
26.0Bright
36.0Bright
46.0Bright
56.0Bright
66.0Bright
76.0Bright
85.9Bright
95.9Bright
105.9Bright
115.9Bright
125.9Bright
135.9Bright
145.9Bright
155.9Bright
165.8Bright
175.8Bright
185.8Bright
195.8Bright
205.8Bright
215.8Bright
225.8Bright
235.8Bright
245.8Bright
255.8Bright
265.8Bright
275.8Bright
285.7Bright
295.7Bright
305.7Bright
Planning a trip in September

Hazard calendar for Port of Spain

In seasonPeak

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

Port of Spain's rainy season runs June–December, when most of the year's rain falls.

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

Is September a good time to visit Port of Spain?

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
5.1
Beach & pool
8th-best month of the year

September is a reasonable time to visit Port of Spain for sightseeing.

What to pack for Port of Spain in September

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

In September, Port of Spain sees daytime highs around 28°C and nights near 26°C. Pack light clothes and rain gear. Worth having: sun protection. About 21 days see rain.

light clothesrain gearsun protection

Sea temperature near Port of Spain 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
Jun28Warm
Jul28Tropical
Aug29Tropical
Sep29Tropical
Oct29Tropical
Nov28Tropical
Dec27Warm

UV index in Port of Spain in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 13 (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 of Spain peaks around March 21 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 12 at about 9 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highMar 21UV 14Dec 12UV 9
UV index (midday)Level
Jan11Extreme
Feb13Extreme
Mar14Extreme
Apr14Extreme
May13Extreme
Jun11Extreme
Jul11Extreme
Aug11Extreme
Sep13Extreme
Oct12Extreme
Nov10Very high
Dec9Very high

Air quality in Port of Spain 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 of Spain is worst in June — around 22 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (November, 10 µg/m³).

Seasonal pattern from CAMS reanalysis, scaled to Port of Spain's WHO annual average of 13.4 µg/m³.

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJun 1521 µg/m³Nov 2310 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb12Moderate
Mar13Moderate
Apr16Moderate
May18Moderate
Jun22Moderate
Jul17Moderate
Aug13Moderate
Sep10Good
Oct11Good
Nov10Good
Dec10Good
Location & terrain

Where is Port of Spain?

Port of Spain sits at 10.7°N, 61.5°W, 21 m above sea level, in Trinidad and Tobago. The nearest listed city is Laventille, 3.0 km away.

TunapunaParadiseChaguanasArimaMarabellaSan Fernando

Topography around Port of Spain

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

Within 3 km, the terrain around Port of Spain has significant variations in elevation — a maximum elevation change of 404 m around an average of 54 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 921 m; within 80 km, large variations in elevation — a maximum elevation change of 1,036 m.

The land around Port of Spain is covered by artificial surfaces (46%), trees (25%) and water (23%) within 3 km, water (49%) and trees (31%) within 16 km, and water (70%) and trees (23%) within 80 km.

3 km
404 m
16 km
921 m
80 km
1,036 m
treesgrasslandartificial surfaceswaterwetlandmangroves
September weather nearby: Laventille 3.0 km · Diego Martin 8.0 km · Tunapuna 14 km · Paradise 17 km · Chaguanas 20 km · Arima 26 km · Marabella 41 km · San Fernando 43 km

Trinidad and Tobago travel facts

Travel advisory
Level 3
Reconsider Travel
Power plugs
Type A / B
115 / 230 V · 60 Hz
Prices
≈ 51% of US
price level, 2025
GDP per capita
$18,967
2025
Happiness
5.9 / 10
World Happiness, 2025
Safe drinking water
69%
of population, 2024
Homicide rate
40.4
per 100k, 2022
Road deaths
9.3
per 100k/yr, 2019
Income group
High
World Bank
Religion
Protestant 32%Roman Catholic 22%Hindu 18%other 8%

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 of Spain (10.6667°, -61.5189°, elevation 21 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. 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).