Monthly climate guide

Willemstad weather in September

September in Willemstad is typically hot, with average daytime highs around 29°C (85°F) and night-time lows near 28°C (83°F). The month usually brings about 36 mm of rain (fairly dry) and is a mix of sun and cloud. Daytime highs are about the same as August and about the same as October.

What stands out in September

Nights stay warm, rarely below 28°C — air-conditioning helps.
There's little difference between day and night (around 1°C).
Humidity near 81% makes 29°C feel stickier than it sounds.
Plan Playa Kenepa for the cooler hours — early morning is best.

September is typically Willemstad's warmest month.

Avg high

29°C

85°F

Avg low

28°C

83°F

Rainfall

36 mm

fairly dry

Humidity

81%

relative

Sky

51%

cloud · a mix of sun and cloud

Live Willemstad forecast Where else to go in September

or share

Willemstad weather by month

Low → high °C Rain (mm)

Show the monthly averages as a table

Average monthly climate in Willemstad
Month	Avg high	Avg low	Rain	Humidity	Cloud cover
January	27°C / 81°F	26°C / 79°F	37 mm	80%	39%
February	27°C / 80°F	26°C / 79°F	20 mm	80%	33%
March	27°C / 80°F	26°C / 79°F	9 mm	80%	43%
April	27°C / 81°F	26°C / 80°F	8 mm	82%	58%
May	28°C / 82°F	27°C / 80°F	15 mm	85%	66%
June	28°C / 82°F	27°C / 81°F	15 mm	85%	59%
July	28°C / 83°F	27°C / 81°F	22 mm	84%	49%
August	29°C / 84°F	28°C / 82°F	25 mm	82%	44%
September	29°C / 85°F	28°C / 83°F	36 mm	81%	51%
October	29°C / 84°F	28°C / 83°F	67 mm	81%	59%
November	29°C / 83°F	28°C / 82°F	105 mm	81%	55%
December	28°C / 82°F	27°C / 81°F	58 mm	80%	43%

What to pack for September

Light, breathable clothing (cotton or linen)
A sun hat and high-SPF sunscreen
A refillable water bottle
A small travel umbrella, just in case
Quick-dry fabrics — it feels stickier than the temperature suggests

Full season-by-season packing guide →

Is September a good time to visit Willemstad?

Our Willemstad guide recommends: Year-round; it's warm, sunny and fairly dry most of the year, with a short rainier period in late autumn.

The trade winds keep the heat pleasant, but the sun is strong — use high-SPF sunscreen.

Best time to visit Willemstad →

Cite or embed this data

Writing about this destination? Copy a ready-made citation or embed a live widget — free, just keep the link.

Citation

Willemstad weather in September. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/curacao/willemstad/september

HTML link

<a href="https://weathercompare.eu/weather/curacao/willemstad/september">Willemstad weather in September</a> (WeatherCompare)

Embed widget

<iframe src="https://weathercompare.eu/embed/curacao/willemstad" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="Willemstad weather in September"></iframe>
<p style="font-size:12px"><a href="https://weathercompare.eu/weather/curacao/willemstad/september">Willemstad weather in September</a> – WeatherCompare</p>

Willemstad in September: quick answers

Is September a good time to visit Willemstad?

September is a reasonable time for Willemstad: highs around 29°C and about 36 mm of rain, though not one of the three best months.

How warm is Willemstad in September?

Average highs are about 29°C (85°F) and average lows about 28°C (83°F), based on 10 years of daily data.

Does it rain a lot in Willemstad in September?

Willemstad typically gets around 36 mm of rain in September — fairly dry.

When is the best time to visit Willemstad?

Year-round; it's warm, sunny and fairly dry most of the year, with a short rainier period in late autumn.

Figures are long-term averages for the area around Willemstad (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.