The average monthly high temperature is 89 degrees Fahrenheit, according to the World Weather Organization. This monthly average varies by only a few degrees each month.
Most of the heat will be felt in the arid interior of the island, while the shores have the benefit of the trade winds.
The average monthly low temperature is 78 degrees and this average also varies by only 2 degrees each month. The monthly low usually occurs at night.
The average seawater temperature is 81 degrees, making Aruba a comfortable place to swim even in the winter. The coolest seawater months are December through March when the temperature averages 76 degrees.
| Aruba Climate Chart | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year | |
| Avg. Maximum Temp. | 86 | 87 | 87 | 88 | 89 | 90 | 89 | 90 | 91 | 90 | 90 | 87 | 89 |
| Avg. Minimum Temp. | 76 | 76 | 76 | 78 | 79 | 80 | 79 | 79 | 80 | 79 | 78 | 76 | 78 |
| Avg. Seawater Temp. | 79 | 79 | 79 | 80 | 81 | 81 | 82 | 82 | 83 | 83 | 83 | 81 | 81 |
| Avg. Rainfall (inches) | 1 | 1 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 3 | 3 | 3 | 16 |
Source: Meteorological Service of Netherland Antilles and Aruba
Rainfall for this dry island is almost non-existent for most of the year. It averages about 1 inch per month every month except for October through December, when rainfall averages 3 inches a month.
Rainfall increases in the late fall and early winter because of the annual Caribbean hurricane season. But Aruba is well known for missing the worst of it, although there are no guarantees.