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Oranjestad, Aruba climate
BSh Hot semi-arid
Oranjestad has a remarkably steady tropical climate (Hot semi-arid, Köppen BSh). The hottest month is September with an average daily high near 96°F, while the coldest is January averaging around 75°F at night. Precipitation totals about 15 inches a year and is strongly seasonal — October alone averages 3.5 inches while April barely receives 0.31 inches.
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresHours of sunshine per day
Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)Oranjestad climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 90 | 91 | 92 | 93 | 94 | 95 | 94 | 96 | 96 | 94 | 92 | 91 |
| Avg temp (°F) | 82 | 83 | 84 | 85 | 87 | 87 | 87 | 88 | 88 | 86 | 85 | 83 |
| Avg low (°F) | 75 | 75 | 76 | 78 | 79 | 79 | 79 | 79 | 79 | 78 | 77 | 76 |
| Precipitation (in) | 0.3 | 0.5 | 0.7 | 0.3 | 0.8 | 1.1 | 1.1 | 1.7 | 1.8 | 3.5 | 1.6 | 1.3 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 90 | 91 | 92 | 93 | 94 | 95 |
| Avg temp (°F) | 82 | 83 | 84 | 85 | 87 | 87 |
| Avg low (°F) | 75 | 75 | 76 | 78 | 79 | 79 |
| Precipitation (in) | 0.3 | 0.5 | 0.7 | 0.3 | 0.8 | 1.1 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 94 | 96 | 96 | 94 | 92 | 91 |
| Avg temp (°F) | 87 | 88 | 88 | 86 | 85 | 83 |
| Avg low (°F) | 79 | 79 | 79 | 78 | 77 | 76 |
| Precipitation (in) | 1.1 | 1.7 | 1.8 | 3.5 | 1.6 | 1.3 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 39 | 39 | 47 | 64 | 68 | 62 | 55 | 51 | 58 | 64 | 61 | 48 |
| Relative humidity (%) | 76 | 75 | 74 | 76 | 78 | 79 | 79 | 78 | 78 | 80 | 80 | 78 |
| Wind speed (mph) | 8.5 | 8.9 | 9.0 | 8.8 | 8.6 | 8.9 | 8.3 | 7.7 | 6.9 | 6.6 | 7.0 | 8.1 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 39 | 39 | 47 | 64 | 68 | 62 |
| Relative humidity (%) | 76 | 75 | 74 | 76 | 78 | 79 |
| Wind speed (mph) | 8.5 | 8.9 | 9.0 | 8.8 | 8.6 | 8.9 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 55 | 51 | 58 | 64 | 61 | 48 |
| Relative humidity (%) | 79 | 78 | 78 | 80 | 80 | 78 |
| Wind speed (mph) | 8.3 | 7.7 | 6.9 | 6.6 | 7.0 | 8.1 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 20 years of daily observations at Jose Leonardo Chirinos, a weather station, about 129 km from the city centre. The underlying daily records come from NOAA's global station network.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.