Click on a day for an hourly weather forecast
The temperatures in Willemstad during September are extremely high, between 28°C and hot as 29°C, drinking water regularly is advisable.
You can expect rain for roughly half of the month of September in Willemstad. We’re expecting roughly 8 to 15 days of rain, so your rubber boots and umbrella are going to see plenty of use this month if you’re keen on staying dry.
Our weather forecast can give you a great sense of what weather to expect in Willemstad in September 2025.
If you’re planning to visit Willemstad in the near future, we highly recommend that you review the 14 day weather forecast for Willemstad before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 27° / 26° | 4 | 27 | 0 | 99 mm | Perfect | Willemstad in January |
| February | 27° / 26° | 2 | 26 | 0 | 60 mm | Perfect | Willemstad in February |
| March | 27° / 26° | 4 | 27 | 0 | 69 mm | Perfect | Willemstad in March |
| April | 27° / 26° | 3 | 27 | 0 | 59 mm | Perfect | Willemstad in April |
| May | 28° / 27° | 5 | 26 | 0 | 92 mm | Perfect | Willemstad in May |
| June | 28° / 27° | 5 | 25 | 0 | 80 mm | Perfect | Willemstad in June |
| July | 28° / 27° | 7 | 24 | 0 | 127 mm | Good | Willemstad in July |
| August | 28° / 28° | 6 | 25 | 0 | 109 mm | Perfect | Willemstad in August |
| September | 29° / 28° | 8 | 22 | 0 | 152 mm | Ok | Willemstad in September |
| October | 29° / 28° | 11 | 20 | 0 | 214 mm | Ok | Willemstad in October |
| November | 29° / 28° | 11 | 19 | 0 | 299 mm | Ok | Willemstad in November |
| December | 28° / 27° | 8 | 23 | 0 | 213 mm | Good | Willemstad in December |