September Weather in Marine on Saint Croix, United States

Last updated: June 24, 2025

In September, the average temperature in Marine on Saint Croix, United States is a comfortable 17°C (64°F). However, be prepared for a range of temperatures, with lows dipping to 2°C (35°F) and highs soaring to 32°C (91°F). Expect 107 mm (4.2 in) of precipitation over approximately 10 days, contributing to an average humidity of a sticky 81%.

September Temperature in Marine on Saint Croix

In September in Marine on Saint Croix, the average temperature is 17°C (64°F). Maximums can reach 32°C (91°F), and minimums can be as low as 2°C (35°F). Travelers should be prepared for a wide range of temperatures during this time.

September Weather in Marine on Saint Croix: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Marine on Saint Croix, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Marine on Saint Croix, September typically has an average temperature of 17°C (64°F), with highs reaching up to 32°C (91°F) and lows dropping to around 2°C (35°F).

Data source: Temperature data for Marine on Saint Croix generated using information from the Copernicus Climate Change Service.

September Precipitation in Marine on Saint Croix

In Marine on Saint Croix in September, the precipitation amount is 107 mm (4.2 in) accumulated over a period of 10 days.

September Precipitation Trends in Marine on Saint Croix

The chart displays monthly precipitation patterns in Marine on Saint Croix, 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 Marine on Saint Croix, September typically receives around 107 mm (4.2 inches) of precipitation spread over approximately 10 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

September Humidity in Marine on Saint Croix

In Marine on Saint Croix in September, humidity is 81%. With an average temperature of 17°C (64°F), this humidity feels like walking through a warm mist, enveloping you in a sticky embrace that can quickly lead to discomfort during long sightseeing excursions.

September Average Humidity in Marine on Saint Croix

This chart illustrates the average monthly humidity levels in Marine on Saint Croix, 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 Marine on Saint Croix is approximately 81%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Marine on Saint Croix

In Marine on Saint Croix in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Marine on Saint Croix.

Maximum UV Index Levels in Marine on Saint Croix for September

The chart shows the monthly maximum UV Index (UVI) for Marine on Saint Croix 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 Marine on Saint Croix typically reaches 7, which falls under the high exposure category.

Data source: Marine on Saint Croix 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 Marine on Saint Croix Compares to Other Months

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

This table compares monthly weather conditions in Marine on Saint Croix, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-9°C (16°F)	25 mm (1.0 inches)	87%	low
February Weather	-9°C (17°F)	35 mm (1.4 inches)	90%	moderate
March Weather	0°C (33°F)	53 mm (2.1 inches)	85%	moderate
April Weather	6°C (43°F)	88 mm (3.5 inches)	84%	high
May Weather	15°C (59°F)	127 mm (5.0 inches)	78%	very high
June Weather	21°C (71°F)	95 mm (3.7 inches)	80%	very high
July Weather	23°C (74°F)	101 mm (4.0 inches)	81%	very high
August Weather	21°C (70°F)	123 mm (4.9 inches)	81%	very high
September Weather	17°C (64°F)	107 mm (4.2 inches)	81%	high
October Weather	9°C (48°F)	101 mm (4.0 inches)	84%	moderate
November Weather	0°C (33°F)	39 mm (1.5 inches)	88%	moderate
December Weather	-5°C (23°F)	55 mm (2.2 inches)	84%	low