Weather in Aruba in September

How September compares

September is the 1st warmest month of the year in Aruba and ranks 26th of 134 destinations we compare for September - see where else is hot in September. Against London's average high of 18.6°C in September, Aruba is 10.8°C warmer by day and 15.7°C warmer at night.

Daytime and night-time in September

The typical September day in Aruba peaks at 29.4°C, but that is an average: the warmest 10% of days reach 30.8°C or more. About 100% of days top 25°C and 1 in 6 pass 30°C. Nights average 26.9°C; one night in ten drops to 25.7°C or lower, so pack a layer for evenings. Between 1991 and 2020 the hottest September day here reached 33.9°C (2019-09-08) and the coldest night 24.2°C (1997-09-09).

Rain in September

Wet (more than 8 rainy days): about 12 days with 1 mm or more, 64 mm in total. Year to year it varies a lot - the wettest September was 2010 with 231 mm, the driest 2015 with 10 mm. Humidity averages 80%, which makes the heat feel heavier than the thermometer suggests.

Sea temperature in September

The sea averages 28.5°C - warm enough to swim (22°c+). Depending on the year it ranges from 27.7°C to 29.1°C. This is the warmest the sea gets here all year.

Sunshine and daylight

Around 4.4 hours of sunshine a day (estimated from cloud cover), 12.1 hours of daylight: the sun rises about 06:29 and sets about 18:41 local time in mid-September. Average cloud cover is 63%.

Is September a good time to visit Aruba?

It is a reasonable choice: hot days but expect showers. The best months for Aruba on our scoring are February, March, June; months averaging 25°C or more: Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec.

Expect heat that lasts into the evening

The temperature alone does not tell the whole story: humidity averages 80%, making the warmth a bigger consideration when planning your day. Every day reaches 25°C in the figures, while 17% reach 30°C, so pack for consistently hot weather rather than occasional warm spells. Loose, lightweight clothing makes sense, with shade breaks around midday and less strenuous plans if you find humid heat tiring. Average night-time lows of 26.9°C mean evenings are still warm, not a chance to cool down properly. Prioritise accommodation where you can sleep comfortably in the heat. September is better suited to travellers who enjoy warmth than those hoping for fresh evenings.

Warm swimming weather, but leave room for rain

The sea averages 28.5°C, making swimming a clear reason to choose September. The catch is that warm water does not come with consistently sunny skies: sunshine averages about 4.4 hours across 12.1 hours of daylight. With about 12 rainy days, keep outdoor plans flexible and bring a light waterproof that will not feel too heavy in the heat. The monthly figures do not tell you when rain will fall or how long it will last, so do not assume it will only interrupt the evening. This month suits a relaxed pace with room to change plans, rather than a holiday that depends on sunshine throughout the day.