Port of Spain weather in September

September in Port of Spain: sweltering, rainy, with clean air — fine if you can take 19 rainy days.

Updated September 2026 · climate normals from ERA5 reanalysis

Port of Spain🇹🇹 Trinidad and Tobago · Southern Caribbean · City66
  1. 75Jan
  2. 77Feb
  3. 77Mar
  4. 74Apr
  5. 71May
  6. 65Jun
  7. 63Jul
  8. 64Aug
  9. 66Sep
  10. 63Oct
  11. 65Nov
  12. 70Dec

#7 of 12 months in Port of Spain · #1031 of 1413 destinations to visit in September · comfort 66/100 (tier C)

Days
32°C
Nights
26°C
Wet days
19
Sun
10.8 h
Humidity
81%
Daylight
12 h
Port of Spain, Trinidad and Tobago
Photo: DizzyNN · CC BY-SA 4.0

Traveller notes on Port of Spain in September

Notes from nearby Tobago (102 km away)

Port of Spain doesn't have its own notes for September yet — these are about Tobago, close enough to share the season.

Caribbean forum threads about dodging hurricane season keep circling back to Tobago's map position: the island sits at the southern edge of the hurricane belt, and posters rank Trinidad and Tobago with the ABC islands among the lower-risk southern options, noting these islands 'do occasionally get brushed by or hit by tropical storms and hurricanes... just not as often as up north' while the Grenadines sit a little more exposed. The other half of the September picture is the green season itself: our record shows about 20 rainy days and 140mm this month, sitting inside the island's long wet stretch - June through August and October through November actually run wetter - so a September visit is about accepting green-season rain as normal rather than timing around a single stormy peak. The consolation is real: a sea near 30C, bath-warm, plus the quiet, beach-oriented character posters consistently describe as Tobago's appeal over its busier sister island.
StoreBayRegular · September · 1 month ago · about Tobago · Read more on Tripadvisor ↗

Other months in Port of Spain

Detailed July-specific trip reports for Port of Spain are relatively thin on the forum, with more discussion focused on rainy-season logistics generally than granular July detail. Posters discussing the broader Trinidad and Tobago rainy season, which runs roughly June through December, describe frequent, often heavy but typically short-lived downpours rather than sustained all-day rain, consistent with the wet-season pattern across this part of the southern Caribbean. Given the limited destination-specific detail for this exact month, this note leans on that broader seasonal cue: July sits within the wetter half of the year for Port of Spain, with hot, humid conditions and a real, near-daily chance of rain that visitors should plan flexible outdoor time around.
Tripadvisor community · July · 1 month ago · Read more on Tripadvisor ↗
Forum coverage of Port of Spain's January weather specifically is thin, with one poster's thread title itself suggesting rain is a real enough possibility to plan a visit around potentially rainy days. Given the limited detailed trip reports available, the broader Caribbean January pattern - the drier, cooler half of the year across most of the region - is the most useful general guide, though Trinidad's position further south and closer to the South American coast means its climate runs a bit more humid and rain-prone year-round than islands further north in the Caribbean chain. Posters generally recommend having backup indoor plans in case a January day in Port of Spain does turn rainy.
Tripadvisor community · January · 1 month ago · Read more on Tripadvisor ↗

Add your own note from Port of Spain's card on the map.

Port of Spain climate normals — September

Daytime high32°C / 89°F🔥 sweltering
Nighttime low26°C / 78°F
Feels like (high)37°C / 99°F
Sea temperature30°C / 86°F♨️ bath-warm
Rainfall97 mm / 3.8 in🌧 rainy
Rainy days19 days
Humidity81%💦 very humid
Dew point24°C / 75°F
Sunshine10.8 h/day
Daylight12.2 h
Wind22 km/h / 13 mph
Air quality (US AQI)37🍃 good

Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.

Crowds in Port of Spain in September

How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.

Shoulder seasonschool holidays in 2 of the markets that fill it, an ordinary month(estimated)

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Peak crowdsBusyShoulder seasonQuiet

Best months for Port of Spain's weather

Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).

Fair weatherPort of Spain's weather doesn't swing hard through the year — comfort stays fairly steady in every month.

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Nearby, and something's on

Within 300 km of Port of Spain — a day trip or a short hop — with something on this month. Never part of the comfort score.

Where is Port of Spain?

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Port of Spain in September — FAQ

Is September a good time to visit Port of Spain?
September in Port of Spain: sweltering, rainy, with clean air — fine if you can take 19 rainy days. It ranks #7 of 12 months for Port of Spain on SeasonMap's comfort score (66/100).
What is the weather like in Port of Spain in September?
In September, Port of Spain averages a daily high of 31.5°C and a low of 25.6°C, with about 97.1 mm of rain over roughly 19.1 rainy days.
What is the air quality in Port of Spain in September?
Port of Spain has a mean US Air Quality Index of about 37 in September.

Within 300 km: Tobago's Emancipation and Independence on 31 Jul – 1 Sep.