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September Weather in Saint Martin, United States

Last updated: June 24, 2025

In September, the average temperature in Saint Martin, United States hovers around 26°C (79°F), offering warm and inviting weather. However, be prepared for a range of temperatures; it can dip as low as 13°C (56°F) or soar up to 36°C (98°F). Expect a fair amount of rain, with 145 mm (5.7 in) of precipitation spread across 14 days, contributing to the region's 80% average humidity.

September Temperature in Saint Martin

In September in Saint Martin, the average temperature is 26°C (79°F), with maximums reaching up to 36°C (98°F) and minimums dipping as low as 13°C (56°F). It's essential to pack both light clothing for the heat and warmer layers for the cooler evenings while traveling.

September Weather in Saint Martin: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Saint Martin, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Saint Martin, September typically has an average temperature of 26°C (79°F), with highs reaching up to 36°C (98°F) and lows dropping to around 13°C (56°F).
JanFebMarAprMayJunJulAugSepOctNovDec535964687580828179726056
Data source: Temperature data for Saint Martin generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Saint Martin

In Saint Martin in September, the total precipitation amount is 145 mm (5.7 in) over a span of 14 days.

September Precipitation Trends in Saint Martin

The chart displays monthly precipitation patterns in Saint Martin, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Saint Martin, September typically receives around 145 mm (5.7 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec921078912213224719022414513258110
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Saint Martin

In Saint Martin in September humidity is 80%. With an average temperature of 26°C (79°F), this humidity feels like a heavy blanket, making outdoor activities feel sticky and exhausting, potentially dampening the travel experience and necessitating frequent breaks to cool down and hydrate.

September Average Humidity in Saint Martin

This chart illustrates the average monthly humidity levels in Saint Martin, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Saint Martin is approximately 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%80%80%78%73%71%79%78%80%76%83%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Saint Martin

In Saint Martin in September, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Saint Martin.

Maximum UV Index Levels in Saint Martin for September

The chart shows the monthly maximum UV Index (UVI) for Saint Martin in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Saint Martin typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec589111111121110864
Data source: Saint Martin September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How September Weather in Saint Martin Compares to Other Months

Weather in Saint Martin varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Saint Martin, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Saint Martin, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather12°C (53°F)92 mm (3.6 inches)82%moderate
February Weather15°C (59°F)107 mm (4.2 inches)80%very high
March Weather18°C (64°F)88 mm (3.5 inches)80%very high
April Weather20°C (68°F)122 mm (4.8 inches)78%extreme
May Weather24°C (76°F)132 mm (5.2 inches)73%extreme
June Weather27°C (81°F)247 mm (9.7 inches)71%extreme
July Weather28°C (82°F)189 mm (7.5 inches)79%extreme
August Weather27°C (82°F)224 mm (8.8 inches)78%extreme
September Weather26°C (79°F)145 mm (5.7 inches)80%very high
October Weather22°C (73°F)132 mm (5.2 inches)76%very high
November Weather15°C (60°F)58 mm (2.3 inches)83%high
December Weather13°C (56°F)110 mm (4.3 inches)87%moderate

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