Arima weather in September

In September, Arima sees average daytime highs of 28°C and overnight lows near 26°C, with 127 mm of rain across 22.6 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 26% 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 Arima's 9th-clearest and 11th-windiest month. For the whole year in context, see Arima's year-round climate.

Daytime high
28°
1st warmest
Overnight low
26°
12th coldest
Rainfall
127 mm
22.6 wet days
Daylight
12 h 06 min
5:58 AM – 6:01 PM
Cloud cover
64%
9th clearest
Wind
17 km/h
11th windiest
Solar energy
5.8 kWh/m²
Travel score
4.0
out of 10

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 Arima reaches about 28°C in the afternoon and slips back to 26°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 30°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)
12825
22825
32825
42825
52825
62825
72825
82825
92825
102825
112825
122825
132825
142826
152826
162826
172826
182826
192826
202826
212826
222826
232826
242826
252826
262826
272826
282826
292826
302826

How September really feels in Arima

Once humidity and wind are folded in, September averages 30 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
30
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.

Arima 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° / 24°7017.311.45.9
Feb26° / 24°3812.111.66.4
Mar27° / 24°329.111.96.8
Apr27° / 25°358.612.26.5
May28° / 25°671412.55.7
Jun27° / 25°14122.912.64.5
Jul27° / 25°16026.712.64.1
Aug28° / 25°16426.812.43.9
Sep28° / 26°12722.612.14.0
Oct28° / 25°14524.111.84.1
Nov27° / 25°16624.711.54.2
Dec27° / 25°11721.711.45.0

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 56%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15446
25545
35545
45446
55347
65248
75149
85050
94951
104852
114753
124456
134357
144357
154159
164159
174159
184159
194060
204060
214060
224060
233961
243961
253961
263862
273862
283862
293763
303664

Chance of precipitation in September

Any precipitation

Arima gets around 127 mm of rain over 22.6 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 76% and peaks near 79% on the wettest days.

0%20%40%60%80%151015202530
Rain chance (%)
177
277
377
477
577
677
777
878
978
1078
1179
1279
1379
1479
1579
1678
1778
1877
1976
2076
2175
2274
2374
2473
2573
2673
2773
2873
2974
3074

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 64% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Oppressive (%)Miserable (%)
16931
26832
36832
46733
56634
66634
76535
86535
96436
106436
116337
126337
136337
146337
156337
166337
176337
186337
196337
206337
216337
226337
236337
246337
256337
266337
276238
286238
296238
306139

Wind in September

Winds average 17 km/h in September.

Across September, daily wind ranges from about 16 km/h on the calmest days to 17 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
116light breeze
216light breeze
316light breeze
416light breeze
516light breeze
616light breeze
716light breeze
816light breeze
916light breeze
1016light breeze
1116light breeze
1217light breeze
1317light breeze
1417light breeze
1517light breeze
1617light breeze
1717light breeze
1817light breeze
1917light breeze
2017light breeze
2117light breeze
2217light breeze
2317light breeze
2417light breeze
2517light breeze
2617light breeze
2717light breeze
2817light breeze
2917light breeze
3017light 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 5:59 AM to 5:57 AM, and sunset from 6:11 PM to 5:52 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.25:596:11
212.25:596:10
312.25:596:10
412.25:586:09
512.25:586:09
612.25:586:08
712.15:586:07
812.15:586:07
912.15:586:06
1012.15:586:05
1112.15:586:05
1212.15:586:04
1312.15:586:03
1412.15:586:03
1512.15:586:02
1612.15:586:01
1712.05:586:01
1812.05:586:00
1912.05:585:59
2012.05:575:58
2112.05:575:58
2212.05:575:57
2312.05:575:56
2412.05:575:56
2512.05:575:55
2612.05:575:55
2711.95:575:54
2811.95:575:53
2911.95:575:53
3011.95:575:52

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.8 kWh/m².

For context, solar energy here swings from a low near 4.87 kWh/m² to a high of 6.45 kWh/m² in April across the year — September's 5.8 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.9Bright
25.9Bright
35.9Bright
45.9Bright
55.9Bright
65.9Bright
75.9Bright
85.9Bright
95.8Bright
105.8Bright
115.8Bright
125.8Bright
135.8Bright
145.8Bright
155.8Bright
165.8Bright
175.8Bright
185.8Bright
195.7Bright
205.7Bright
215.7Bright
225.7Bright
235.7Bright
245.7Bright
255.7Bright
265.7Bright
275.7Bright
285.7Bright
295.6Bright
305.6Bright
Planning a trip in September

Is September a good time to visit Arima?

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

4.0
Sightseeing
11th-best month of the year
4.8
Beach & pool
7th-best month of the year

September is a reasonable time to visit Arima for sightseeing.

What to pack for Arima in September

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

In September, Arima sees daytime highs around 28°C and nights near 26°C. Pack light clothes and rain gear. Worth having: sun protection. About 23 days see rain.

light clothesrain gearsun protection

Sea temperature near Arima 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 28 km away) 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
May27Warm
Jun28Warm
Jul28Tropical
Aug29Tropical
Sep29Tropical
Oct29Tropical
Nov28Tropical
Dec27Warm

UV index in Arima 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 Arima 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
Mar15Extreme
Apr14Extreme
May13Extreme
Jun11Extreme
Jul11Extreme
Aug11Extreme
Sep13Extreme
Oct12Extreme
Nov10Very high
Dec9Very high

Air quality in Arima 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 Arima is worst in June — around 31 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (November, 14 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecModerateJun 1530 µg/m³Nov 2314 µg/m³
PM2.5 (µg/m³)Level
Jan15Moderate
Feb18Moderate
Mar19Moderate
Apr23Moderate
May26Moderate
Jun31Moderate
Jul24Moderate
Aug18Moderate
Sep15Moderate
Oct17Moderate
Nov14Moderate
Dec15Moderate
Location & terrain

Where is Arima?

Arima sits at 10.6°N, 61.3°W, 62 m above sea level, in Trinidad and Tobago. The nearest listed city is Paradise, 9.0 km away.

ParadiseTunapunaSangre GrandeChaguanasLaventillePort of SpainDiego MartinRio Claro

Topography around Arima

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

Within 3 km, the terrain around Arima has significant variations in elevation — a maximum elevation change of 343 m around an average of 79 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 940 m; within 80 km, large variations in elevation — a maximum elevation change of 961 m.

The land around Arima is covered by artificial surfaces (44%) and trees (41%) within 3 km, trees (70%) within 16 km, and water (72%) and trees (21%) within 80 km.

3 km
343 m
16 km
940 m
80 km
961 m
treesgrasslandartificial surfaceswaterwetland
September weather nearby: Paradise 9.0 km · Tunapuna 12 km · Sangre Grande 18 km · Chaguanas 20 km · Laventille 24 km · Port of Spain 26 km · Diego Martin 32 km · Rio Claro 39 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 Arima (10.6374°, -61.2823°, elevation 62 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).