Climate Overview
The climate in Willemstad is hot. The average annual temperature is 27°C and approximately 596mm of precipitation falls per year. November is the wettest month, receiving around 152mm of rainfall. Willemstad is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: September, October, August. The coldest months are February, January, March, when temperatures can drop to 25°C.
Temperature
Willemstad has relatively stable temperatures year-round, staying within a 4°C range. The warmest month is September, when average highs reach 29°C and the mean temperature sits around 28°C. February is the coolest month, with minimum temperatures around 25°C and an average of 26°C. Daily temperature variation is modest, with an average difference of 1°C between highs and lows.
Precipitation
Willemstad is a relatively dry area, receiving approximately 596mm of precipitation annually, which averages out to around 50mm per month. The wettest month is November, averaging 152mm of rainfall. October and December also tend to see above-average precipitation. The driest month is April, with just 17mm. That's 136mm less than November, the wettest month. Rainfall is heavily concentrated in certain months, creating a distinct wet and dry season. Visitors should plan around these patterns, as the difference between peak and low months is dramatic.
Wind
Willemstad is very windy, with an average annual wind speed of 33km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is May, averaging 36km/h, which can feel quite blustery and may affect outdoor activities. The calmest conditions occur in November, with average winds dropping to 29km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 7km/h between the calmest and windiest months.
Seasons
89 days until Summer
It is currently spring in Willemstad, which began on March 20, 2026. Willemstad is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in September at around 29°C, while the coldest stretch bottoms out in February near 25°C. Summer is next, beginning on June 21, 2026 — 89 days from now.
Spring
Temperatures range from 26 to 27°C. Rainfall is relatively light, with around 59mm over the season and a monthly average of 20mm. Winds are strong, averaging 34km/h. Light layers work well as temperatures warm through the season — a great time to be outdoors.
Summer
Temperatures range from 27 to 28°C. Rainfall is relatively light, with around 116mm over the season and a monthly average of 39mm. Winds are strong, averaging 35km/h. Light, breathable clothing is ideal — perfect conditions for outdoor activities.
Autumn
Temperatures range from 27 to 29°C. Rainfall is heavy, totalling around 303mm across the season with a monthly average of 101mm. Winds are strong, averaging 30km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 25 to 27°C. Rainfall is relatively light, with around 118mm over the season and a monthly average of 39mm. Winds are strong, averaging 33km/h. A light jacket or sweater is usually sufficient, though cooler evenings may call for an extra layer.
Monthly Climate Data
The table below shows monthly climate averages for Willemstad based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.
