Climate averages 1991–2020
Willemstad weather
in September.
A hot, moderately wet month: the warmest and the 9th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a hot month in Willemstad: daytime highs average 29.1°C and nights cool to about 27.0°C. By daytime temperature it is the warmest month of the year.
Expect about 66 mm of rain on roughly 15 days, which makes September a moderately wet month (the 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 12 min on an average September day.
The nearest other city in this atlas is Kralendijk (67 km away). In September its highs average 29.1°C, about as warm as Willemstad, with 74 mm of rain.
From September to October, average highs fall by 0.5°C to 28.7°C, and monthly rainfall rises from 66 mm to 110 mm.
The annual picture
September in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Willemstad climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 26.9°C25.1°C | 25.1°C | 46 | 12.9 | 11.511 h |
| February | 26.9°C25.0°C | 25.0°C | 23 | 7.6 | 11.712 h |
| March | 27.2°C25.2°C | 25.2°C | 20 | 6.1 | 12.112 h |
| April | 27.7°C25.8°C | 25.8°C | 30 | 6.9 | 12.412 h |
| May | 28.2°C26.3°C | 26.3°C | 36 | 8.4 | 12.713 h |
| June | 28.3°C26.4°C | 26.4°C | 43 | 12.0 | 12.813 h |
| July | 28.3°C26.3°C | 26.3°C | 44 | 12.5 | 12.813 h |
| August | 28.8°C26.8°C | 26.8°C | 46 | 12.5 | 12.513 h |
| September, selected | 29.1°C27.0°C | 27.0°C | 66 | 15.0 | 12.212 h |
| October | 28.7°C26.6°C | 26.6°C | 110 | 20.9 | 11.912 h |
| November | 27.9°C26.0°C | 26.0°C | 150 | 23.0 | 11.612 h |
| December | 27.3°C25.5°C | 25.5°C | 84 | 18.1 | 11.411 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Kralendijk in SeptemberBonaire, Saint Eustatius and Saba · 67 kmHigh 29.1°C · Low 26.9°C · 74 mm rain
- Coro in SeptemberVenezuela · 117 kmHigh 34.3°C · Low 25.2°C · 85 mm rain
- Oranjestad in SeptemberAruba · 132 kmHigh 29.1°C · Low 26.9°C · 65 mm rain
- Punto Fijo in SeptemberVenezuela · 151 kmHigh 32.6°C · Low 26.4°C · 50 mm rain
- San Felipe in SeptemberVenezuela · 199 kmHigh 30.6°C · Low 22.3°C · 93 mm rain
- Puerto Cabello in SeptemberVenezuela · 207 kmHigh 30.2°C · Low 24.6°C · 90 mm rain
- Chivacoa in SeptemberVenezuela · 218 kmHigh 29.7°C · Low 22.5°C · 115 mm rain
- Yaritagua in SeptemberVenezuela · 228 kmHigh 28.8°C · Low 21.7°C · 106 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Willemstad) is explained once on the Willemstad year overview and on the Sources, method and limits page.