In Aruba, the climate is tropical, hot all year round: daytime temperatures hover around 29/31 degrees Celsius (84/88 °F) throughout the year, the air is muggy, but the wind tempers the heat.
Here are the average temperatures of the capital, Oranjestad.

Precipitation is scarce, in fact it amounts to around 500 millimeters (20 inches) of rain per year. The only fairly rainy period is from October to December, when 80/95 millimeters (3/3.7 inches) or rain fall per month. This happens because of the north-east trade winds, which can cause rain showers quite frequently even in January and in the first half of February. The driest months are March, April and May, with less than 10/15 mm (0.3/0.8 inches) per month.
Here is the average precipitation.

Aruba is a flat island, and owing to the scarcity of rain water and streams, the water is desalinated from the sea.
The amount of sunshine is good all year round, as can be seen in the following table.

The trade winds blow constantly, and the east coast is affected by strong sea currents, while the western and southern coasts are more sheltered, and made of sandy beaches.
Aruba is a constituent part of the Netherlands. It's catalogued together with Curaçao, Bonaire and some islands of Venezuela among the Leeward Antilles, namely those islands that in comparison with the rest of the Caribbean have an arid climate, as evidenced by the vegetation consisting mainly of shrubs and cacti. The three islands that once belonged to the Netherlands Antilles (Aruba, Curaçao and Bonaire) are sometimes called ABC Islands.



The sea in Aruba is warm enough to swim in throughout the year: the water temperature ranges from 26 °C (79 °F) in the January-April period, to 29 °C (84 °F) in October. Here are the average sea temperatures.

Hurricanes

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From June to November, but especially from August to October, there is the danger of tropical storms and hurricanes, which, however, at these latitudes are rare because Aruba is located at the southern edge of the hurricane belt. Anyway, it's not impossible that hurricanes could hit Aruba, as happened for example with Hurricane Irene in September 1971, Joan in October 1988, Bret (tropical storm) in August 1993, Ivan in September 2004, Felix in September 2007 and Omar in October 2008.

Best Time

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The best time to visit Aruba is from mid-February to May, in fact it is the least rainy, and also outside of the period of hurricanes. The period from May to October is more sultry, even though the trade winds make the heat bearable. In the period from October to December, rainfall is moderate but not excessive, and at times this relatively rainy period continues until January or mid-February.

What to pack

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All year round: bring tropics-friendly, light clothes made of cotton or linen, and possibly a light raincoat for thunderstorms, especially from October to January. Those who are sensitive to cold can bring a light sweatshirt for the evening.
When going to the reef, you can bring snorkeling equipment, including water shoes or rubber-soled shoes.