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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 36°C, while the coldest is January averaging around 24°C at night. Precipitation totals about 372 mm a year and is strongly seasonal — October alone averages 88 mm while April barely receives 8 mm.
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 (°C) | 32 | 33 | 33 | 34 | 35 | 35 | 35 | 36 | 36 | 35 | 33 | 33 |
| Avg temp (°C) | 28 | 28 | 29 | 30 | 30 | 31 | 30 | 31 | 31 | 30 | 29 | 29 |
| Avg low (°C) | 24 | 24 | 25 | 25 | 26 | 26 | 26 | 26 | 26 | 26 | 25 | 25 |
| Precipitation (mm) | 9 | 12 | 17 | 8 | 20 | 29 | 29 | 43 | 46 | 88 | 40 | 32 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 32 | 33 | 33 | 34 | 35 | 35 |
| Avg temp (°C) | 28 | 28 | 29 | 30 | 30 | 31 |
| Avg low (°C) | 24 | 24 | 25 | 25 | 26 | 26 |
| Precipitation (mm) | 9 | 12 | 17 | 8 | 20 | 29 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 35 | 36 | 36 | 35 | 33 | 33 |
| Avg temp (°C) | 30 | 31 | 31 | 30 | 29 | 29 |
| Avg low (°C) | 26 | 26 | 26 | 26 | 25 | 25 |
| Precipitation (mm) | 29 | 43 | 46 | 88 | 40 | 32 |
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 (km/h) | 13.7 | 14.4 | 14.5 | 14.2 | 13.9 | 14.3 | 13.3 | 12.3 | 11.1 | 10.5 | 11.3 | 13.0 |
| 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 (km/h) | 13.7 | 14.4 | 14.5 | 14.2 | 13.9 | 14.3 |
| 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 (km/h) | 13.3 | 12.3 | 11.1 | 10.5 | 11.3 | 13.0 |
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.