Willemstad Weather: September
 |
Average Day Temperature: | 91.7°F |
|
Average Night Temperature: | 87.1°F |
|
Sea Water Temperature: | 88.0°F |
|
Number of Sunny Days: | 18 days |
| Sunshine Hours: | 12.0 - 12.3 hours | |
|
Number of Rainy Days: | 4 days |
| Precipitation Totals: | 1.9 in | |
| detailed information | ||
forecast
| Willemstad |
Temperature
| Willemstad |
Air Temperature in September, °F
The highest day temperature in September 2025 was 99°F. The lowest night temperature was 75°F. The average values for day and night temperatures during September were 96.3°F и 77.0°F respectivly.
Willemstad Water Sea Temperature in September, °F
The average sea surface temperature in September 2025 for Willemstad was 88.5°F. The maximum and minimum values were 87.4°F and 89.6°F respectively.
Most of the days in September are sunny but you can also expect cloudy and gloomy days.
Precipitation Totals in September, in
Precipitation total in September for Willemstad is 1.9 in.
The average wind speed in September is 17.4 mph. It makes September one of the most windless months of the year for Willemstad.
We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Willemstad in September is 8.9 hours.
Willemstad on the Weather Map
| 0300 |  |
72°F | N 3 mph |
| 0600 | |
72°F | N 4 mph |
| 0900 | |
80°F | NW 4 mph |
| 1200 |  |
86°F | W 9 mph |
| 1500 | |
84°F | W 10 mph |
| 1800 | |
80°F | W 7 mph |
| 2100 | |
78°F | W 6 mph |
| 0000 | |
74°F | NW 5 mph |