Trinity, United States — Weather in September 2026

Climate Overview

Trinity, United States in September has hot conditions, with highs reaching 29.4°C (85°F) and afternoons the warmest part of the day. Rain falls on about 18 days this month, totalling around 146 mm. Sea temperature reaches 29.9°C (86°F).

This month falls at the beginning of Autumn.

Temperatures remain fairly steady throughout September, with daily highs around 29°C (84°F).

September sees fairly even rainfall, totalling about 147 mm across the month.

The warmest days tend to fall around the 5th, averaging 30.1°C (86°F).

Compared to August, this month is about 1°C cooler with 3 fewer rainy days. Temperatures begin dropping heading into October.

Monthly September Averages

Temperature

29°C / 25°C

Feels Like

34°C / 27°C

Rain

18 days · 146 mm

Sunshine

10h / day

Humidity

80% — Very Muggy

Wind

23 km/h

Wind Direction

ENE (72°)

Gusts

33 km/h

Daylight

12.3 h

Cloud Cover

58%

Clear Sky Days

4.2

UV Index

7.4 — Very High

Sea Temperature

30°C

Dew Point

23°C — Muggy

Moon Phase

Waxing Crescent · 11%

Climate Charts

Daily averages based on historical data (2016–2025)

Daily Temperature

HighLow

Daily Precipitation

Rainfall

Daily Sunshine

Sunshine

Daily Wind Speed

Wind Speed

Sun Position

Sunrise 07:17

Daylight 12.3h

Sunset 19:38

What to Expect

Daytime temperatures around 29°C (85°F) are ideal for full-day outdoor exploration. Keep afternoons flexible as tropical showers are common — they typically clear within an hour.

Rain most often builds later in the day, so mornings are typically the driest window and afternoon showers are more likely.

Recent yearly records for September have stayed close to the long-run average.

Compare Months

Month	Temp	Feels Like	Rain	Sun	Humidity	UV	Status	Details
January	19°C / 13°C	18°C / 9°C	7days (64 mm) Good	8.2h Good	74% Muggy	4.6 Moderate	Good	View Details
February best	22°C / 15°C	22°C / 14°C	5days (61 mm) Good	9.3h Good	79% Humid	5.8 High	Excellent	View Details
March best	23°C / 17°C	24°C / 16°C	5days (41 mm) Good	10.2h Excellent	73% Muggy	7.2 Very High	Excellent	View Details
April best	26°C / 20°C	28°C / 19°C	6days (54 mm) Good	11.1h Excellent	70% Muggy	8.2 Very High	Excellent	View Details
May	29°C / 22°C	32°C / 24°C	8days (85 mm) Wet	11.8h Excellent	72% Muggy	8.5 Very High	Good	View Details
June	30°C / 25°C	35°C / 28°C	18days (139 mm) Wet	11.4h Excellent	79% Humid	8.4 Very High	Wet	View Details
July	30°C / 26°C	36°C / 30°C	22days (164 mm) Wet	11.2h Excellent	81% Humid	8.3 Very High	Wet	View Details
August	30°C / 26°C	36°C / 30°C	21days (204 mm) Wet	10.4h Excellent	81% Humid	8 Very High	Wet	View Details
September	29°C / 25°C	34°C / 27°C	18days (146 mm) Wet	10h Excellent	80% Humid	7.4 Very High	Wet	View Details
October best	27°C / 22°C	30°C / 22°C	8days (68 mm) Wet	9.7h Good	76% Humid	6.1 High	Excellent	View Details
November best	24°C / 18°C	24°C / 17°C	5days (34 mm) Good	8.8h Good	75% Muggy	5 Moderate	Excellent	View Details
December	21°C / 15°C	21°C / 13°C	5days (49 mm) Good	8.2h Good	77% Humid	4.3 Moderate	Excellent	View Details

What to Wear

Summer clothing like shorts, t-shirts, and sundresses will be comfortable. Bring a light cardigan for air-conditioned spaces.

A waterproof jacket or compact umbrella is recommended for occasional showers.

Packing List

UmbrellaWaterproof jacketWaterproof shoesBreathable clothingSunscreen (SPF 30+)Sun hatSunglasses

Frequently Asked Questions

Expand all

Is September a good time to visit Trinity?

September is typically wet for visiting Trinity, with average highs of 29°C (85°F) and around 18 rainy days. Trinity, United States in September has hot conditions, with highs reaching 29.4°C (85°F) and afternoons the warmest par

Does it rain a lot in Trinity in September?

Trinity typically sees around 18 rainy days in September with 146 mm (5.7 in) of total rainfall. Pack a waterproof jacket.

Does it get cold at night in Trinity in September?

Nights stay pleasantly warm in Trinity during September, around 25°C (76°F). Light evening wear is sufficient.

What should I pack for Trinity in September?

With highs of 29°C (85°F) and lows of 25°C (76°F) in September, we recommend: Umbrella, Waterproof jacket, Waterproof shoes, Breathable clothing, Sunscreen (SPF 30+). Comfortable walking shoes are essential.

Is September among the best months weather-wise in Trinity?

September is not the most favourable month weather-wise in Trinity. Consider visiting during months with milder temperatures or less rainfall for a better experience.

What is the UV index in Trinity in September?

The average UV index in Trinity during September is 7 (high). Wear sunscreen SPF 30+, a hat, and sunglasses. Limit direct sun exposure between 10 AM and 4 PM.

How many hours of daylight are there in Trinity in September?

Trinity gets approximately 12 hours of daylight per day in September, with around 10 hours of sunshine.

Does it snow in Trinity in September?

Snow is uncommon in Trinity during September based on 10-year climate averages.

Last updated: