Willemstad Weather in September
September in Willemstad brings high temperatures, with daytime highs of 30°C (86°F) and nights around 27°C (81°F). Quite a bit of rainfall is expected, around 83 mm (3.3 in), so pack an umbrella.
Rainfall in Willemstad in September
Typically, about 6 days will experience rainfall, with an average of 83 mm (3.3 in) for the month. Showers tend to be short but heavy rather than persistent drizzle. When it rains, it usually means it, but it doesn't last long.
Temperature in Willemstad in September
Daytime highs in Willemstad in September reach 30°C (86°F), with nights around 27°C (81°F). This kind of day-to-night contrast is typical for this time of year. With lows of 27°C (81°F), it stays warm throughout the night. A cold shower before going to sleep is one of the easiest ways to cool down before bed.
Sunshine in Willemstad in September
The days are predominantly sunny, with an estimated total of around 262 hours of sunshine. These sun-filled days are perfect for playing sports, visiting parks, or going for a bike ride.Our weather planner can help you find worldwide destinations with pleasant weather during this period. January, February, March, April, May, June, July, August and December typically offer the best weather for Willemstad.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Curaçao, check out our Willemstad's climate page.
Willemstad Temperature in September
Min Temperature
27°C (81°F)
Max Temperature
30°C (86°F)
Chance of Rain
21%
Precipitation
83 mm (3.3 in)
Rainy days
6 days
Humidity
78%
Sunshine
262 hours
Percentage Sunshine
71%
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Willemstad typically stay consistent throughout September, with daily highs averaging around 30°C (86°F). Nights are warm, with lows around 27°C (81°F).
Average temperatures in September
Historical weather for Willemstad in September
Browse day-by-day weather records for Willemstad spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Willemstad historical weather extremes in September
Our historical data for Willemstad spans 1995 to 2025, revealing these weather extremes.
- Willemstad recorded its highest September temperature of 38°C (100°F) on September 11, 1996.
- The lowest daytime temperature in September was 27°C (81°F), recorded on September 8, 2004.
- Nighttime temperatures dropped to 20°C (68°F) on September 2, 2025, marking the coldest September night on record.
Best Places in Curaçao in September
Find out more about the weather in Curaçao and which places have the best travel conditions in this month. See all of Curaçao in September →
perfect weather
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tolerable
unpleasant
poor
What to Wear in Willemstad in September
Warm but pleasant conditions in Willemstad in September. Focus on lightweight, maybe with natural fabrics, cotton blend shirts, comfortable shorts, and breathable footwear. A light cover-up for sun protection is smart too. Expect heavy rainfall, so bring good rain protection and waterproof bags. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.What To Do in Willemstad in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Curaçao, check out our Willemstad's climate page.
Temperature Rainfall Sunshine Humidity
See the full Willemstad climate overview or explore weather in Curaçao.
