Caguas, Puerto Rico — Weather in September 2026

Climate Overview

Caguas, Puerto Rico in September has hot conditions, with highs reaching 30.4°C (87°F) and afternoons the warmest part of the day. Rain falls on about 26 days this month, totalling around 194 mm.

This month falls at the beginning of Autumn. The combination of heat and frequent rain creates tropical monsoon conditions.

Temperatures remain fairly steady throughout September, with daily highs around 30°C (86°F).

September sees fairly even rainfall, totalling about 194 mm across the month.

Expect around 10.9h of sunshine at the start of September, decreasing to 10.3h by the end.

The warmest days tend to fall around the 11th, averaging 30.7°C (87°F).

Compared to August, this month is about 0°C cooler with 3 more rainy days.

Monthly September Averages

Temperature

30°C / 25°C

Feels Like

37°C / 30°C

Rain

26 days · 194 mm

Sunshine

10.5h / day

Humidity

86% — Very Muggy

Wind

14 km/h

Wind Direction

E (99°)

Gusts

34 km/h

Daylight

12.2 h

Cloud Cover

66%

Clear Sky Days

0.2

UV Index

8.4 — Very High

Dew Point

25°C — Oppressive

Moon Phase

Waxing Crescent · 11%

Climate Charts

Daily averages based on historical data (2016–2025)

Daily Temperature

High Low

Daily Precipitation

Rainfall

Daily Sunshine

Sunshine

Daily Wind Speed

Wind Speed

Sun Position

Sunrise 06:12

Daylight 12.2h

Sunset 18:26

What to Expect

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 best	28°C / 22°C	31°C / 25°C	16days (44 mm) Wet	10.4h Excellent	83% Humid	6.3 High	Good	View Details
February best	28°C / 22°C	31°C / 25°C	15days (54 mm) Wet	10.7h Excellent	82% Humid	7.4 Very High	Good	View Details
March best	28°C / 22°C	32°C / 25°C	17days (59 mm) Wet	10.9h Excellent	80% Humid	8.5 Very High	Fair	View Details
April	29°C / 23°C	33°C / 26°C	19days (109 mm) Wet	11.3h Excellent	81% Humid	8.3 Very High	Wet	View Details
May	30°C / 24°C	35°C / 28°C	21days (116 mm) Wet	11.5h Excellent	83% Humid	8.6 Very High	Wet	View Details
June	30°C / 25°C	35°C / 29°C	20days (88 mm) Wet	12h Excellent	83% Humid	8.5 Very High	Wet	View Details
July	30°C / 25°C	36°C / 30°C	22days (113 mm) Wet	11.7h Excellent	83% Humid	8.5 Very High	Wet	View Details
August	31°C / 25°C	36°C / 30°C	23days (127 mm) Wet	11.1h Excellent	85% Humid	8.7 Very High	Wet	View Details
September	30°C / 25°C	37°C / 30°C	26days (194 mm) Wet	10.5h Excellent	86% Very Muggy	8.4 Very High	Wet	View Details
October	30°C / 25°C	36°C / 30°C	26days (172 mm) Wet	9.9h Good	87% Very Muggy	7.5 Very High	Wet	View Details
November	29°C / 24°C	34°C / 28°C	22days (139 mm) Wet	9.6h Good	87% Very Muggy	6.5 High	Wet	View Details
December best	28°C / 23°C	31°C / 26°C	18days (53 mm) Wet	10.2h Excellent	85% Humid	6.1 High	Wet	View Details

What to Wear

Light, breathable fabrics like cotton and linen are essential. Opt for loose-fitting clothing in light colors to stay cool.

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 Caguas?

September is typically wet for visiting Caguas, with average highs of 30°C (87°F) and around 26 rainy days. Caguas, Puerto Rico in September has hot conditions, with highs reaching 30.4°C (87°F) and afternoons the warmest part o

Does it rain a lot in Caguas in September?

Caguas typically sees around 26 rainy days in September with 194 mm (7.6 in) of total rainfall. Pack a waterproof jacket.

Does it get cold at night in Caguas in September?

Nights stay pleasantly warm in Caguas during September, around 25°C (77°F). Light evening wear is sufficient.

What should I pack for Caguas in September?

With highs of 30°C (87°F) and lows of 25°C (77°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 Caguas?

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

What is the UV index in Caguas in September?

The average UV index in Caguas during September is 8 (very high). Strong sun protection is essential — SPF 50+, protective clothing, and avoid prolonged outdoor exposure during peak hours.

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

Caguas gets approximately 12 hours of daylight per day in September, with around 11 hours of sunshine.

Does it snow in Caguas in September?

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

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