Weather in St Maarten in September 2025
Average weather
Average temperature in St Maarten in September
The expected average maximum temperature in September is +90°F with a maximum of +91°F and a minimum of +79°F.
The average maximum temperature goes up 14% by the end of the month, compared with the beginning of the month, from +90°F to +91°F.
Is St Maarten warm or cold in September?
St Maarten is typically warm in September.
Maximum temperatures go up compared to the previous month from +84°F to +84°F. The minimum temperature also goes up from +79°F to +79°F.
It’s generally warm, but pack a long-sleeve shirt for evenings.
September is one of the warmest months in St Maarten, here is the comparison with other months:
Climate in St Maarten in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +84°F | +84°F | +84°F | ||||
| Min. temperature | ||||||
| +72°F | +75°F | +73°F | ||||
| Max. temperature | ||||||
| +91°F | +93°F | +93°F | ||||
| Rainfall | ||||||
| 76 mm | 108 mm | 114 mm | ||||
| Wind | ||||||
| 5 m/s | 4 m/s | 4 m/s | ||||
| Humidity | ||||||
| 78% | 78% | 78% | ||||
| Air pressure | ||||||
| 1014 HPa | 1013 HPa | 1012 HPa | ||||
| Sunny days | ||||||
| 2 | 2 | 2 | ||||
| Cloudy days | ||||||
| 4 | 3 | 3 | ||||
| Rainy days | ||||||
| 24 | 23 | 24 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
September weather is still as ok as in August. The temperature levels stay the same in the area of +84°F for average maximum temperature during the day. Prepare for more rain. Average rainfall goes from 76 mm to 108 mm. Humidity levels don’t change as the month goes on, averaging around 78%. Winds are calmer in comparison to August, going down from 5 m/s to 4 m/s on average. The amount of sunny days stay about the same, averaging 2 sunny days during the month.
October brings much the same weather, it remains ok.
Wind
The average wind speed is 4 m/s getting up to 7 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in St Maarten is gradually increasing during September, going from 4 m/s to 5 m/s over the course of the month.
Rain
How was the weather last September in St Maarten?
Climate Change Over the Years
The climate in St Maarten in September has not changed that much over the last 43 years.
The average temperature was the lowest in 1985 (+79°F) and the highest in 2024 (+87°F). The driest year was 1994 with only 342 mm of rainfall, and the wettest year was 1999 with 1120 mm.
FAQ
Is September a good time to visit St Maarten?
Can you sunbathe in St Maarten in September?
Is St Maarten rainy in September?
Is it sunny in St Maarten in September?
Monthly weather in St Maarten
Source of the data
For this page, we’ve looked at the typical weather in St Maarten, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.
