Sint Eustatius Weather in September
September in Sint Eustatius brings high temperatures around 30°C (86°F) during the day, dropping to 27°C (81°F) at night, with the most rainfall of the year.
Rainfall in Sint Eustatius in September
Since this month has the highest rainfall, keep an umbrella with you to handle sudden showers. Expect around 18 days of rain based on historical data, with 131 mm (5.2 in) average. This month brings frequent, heavy showers. Both the number of wet days and the rainfall totals are on the high side.
Temperature in Sint Eustatius in September
In September, expect high temperatures in Sint Eustatius , with highs of 30°C (86°F) and lows of 27°C (81°F) at night. The days can feel warmer than the evenings, so packing for both parts of the day is a good idea. At 27°C (81°F) overnight, the heat doesn't let up much after dark. If you're staying somewhere without air conditioning, a cold shower before bed and keeping the air moving can help.
Average water temperature in September
At 29°C (84°F), the water feels bath-warm. Fine for swimming, but those looking for a cooling swim may be a bit disappointed.If you prefer dry days with pleasant temperatures, September may not be the ideal month to visit Sint Eustatius . Our weather planner can help you explore destinations with more pleasant weather conditions.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Bonaire, St Eustatius, Saba, check out our Sint Eustatius 's climate page.
Sint Eustatius Temperature in September
Min Temperature
27°C (81°F)
Max Temperature
30°C (86°F)
Water Temperature
29°C (84°F)
Chance of Rain
60%
Precipitation
131 mm (5.2 in)
Rainy days
18 days
Humidity
78%
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Sint Eustatius typically stay consistent throughout September, with daily highs averaging around 30°C (86°F). Nights are warm, with lows around 26°C (79°F).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather for Sint Eustatius in September
Browse day-by-day weather records for Sint Eustatius spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Sint Eustatius historical weather extremes in September
Based on 35 years of weather observations in Sint Eustatius between 1990 and 2025, these are the recorded extremes.
- The hottest September day on record in Sint Eustatius reached 39°C (102°F) (September 1, 2003).
- The lowest daytime temperature in September was 27°C (81°F), recorded on September 17, 2022.
- Sint Eustatius registered its coldest September night on September 30, 2017, with temperatures dropping to 22°C (72°F).
Best Places in Bonaire, St Eustatius, Saba in September
Find out more about the weather in Bonaire, St Eustatius, Saba and which places have the best travel conditions in this month. See all of Bonaire, St Eustatius, Saba in September →
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What to Wear in Sint Eustatius in September
Warm weather calls for comfortable, breathable clothing in September. Cotton t-shirts, shorts, light dresses, and sandals are perfect. You might still want a light layer for evenings or air-conditioned places (for example buses). High rain levels are expected, so pack waterproof gear and an umbrella or poncho. With water temperatures around 29°C (84°F), swimming conditions are excellent. Pack your swimsuit, goggles, and maybe some water shoes.What To Do in Sint Eustatius 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 Bonaire, St Eustatius, Saba, check out our Sint Eustatius 's climate page.
Temperature Rainfall Humidity Water Temp
See the full Sint Eustatius climate overview or explore weather in Bonaire, St Eustatius, Saba.
