September weather forecast
United States Virgin Islands, USA

September in the United States Virgin Islands is characterized by its place within the climax of the wet season, while also standing at the apex of the hurricane season. Temperatures during this month maintain a range from a tropical 79°F (26.1°C) during the cooler nights to a torrid peak of 90°F (32.2°C) as the day progresses.

In relation to August, September sustains the heat and oppressive humidity that have become synonymous with this period. Rain showers, often accompanied by thunderstorms, are both regular and pronounced, predominantly during the afternoons and evenings. In fact, September often contends for the title of the rainiest month of the year.

The capital, Charlotte Amalie in Saint Thomas, usually experiences weather patterns reflective of the broader archipelago. Nonetheless, its urban sprawl combined with the heat characteristics of its harbor can sometimes intensify the warmth, particularly during mid-day.

Rainfall in September is more than just frequent showers; it can manifest as extended, heavy downpours. This is further complicated by the fact that the surrounding seas, while boasting temperatures from 86°F (30°C) to 88°F (31.1°C), can become turbulent due to weather disturbances. Thus, while the water remains warm, marine activities might be affected by the unstable weather.

The day-to-night duration remains equitably balanced due to the islands' equatorial proximity. Crucially, September is a month of heightened weather vigilance for the United States Virgin Islands. The possibility of encountering tropical storms or even full-fledged hurricanes is considerably amplified, making it imperative for residents and visitors alike to be well-informed and prepared.

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• Charlotte Amalie - September »
  September is the month with the warmest seawater in Charlotte Amalie with an average ocean temperature of 84.9°F (29.4°C). In Charlotte Amalie in September, it is raining for 22.2 days, with typically 4.45" (113mm) of accumulated precipitation.
• Frederiksted - September »
  In Frederiksted in September, during 22.8 rainfall days, 4.09" (104mm) of precipitation is typically accumulated. In Frederiksted in September, during 22.8 rainfall days, 4.09" (104mm) of precipitation is typically accumulated.
• Saint John - September »
  September and October, with an average ocean temperature of 84.2°F (29°C), are months with the warmest seawater in Saint John, United States Virgin Islands. On the first day of September in Saint John sunrise is at 6:04 am and sunset at 6:33 pm.
• Virgin Islands National Park - September »
  With an average ocean temperature of 84.9°F (29.4°C), September is the month with the warmest seawater in Virgin Islands National Park, United States Virgin Islands. The month with the warmest seawater in Virgin Islands National Park is September, with an average ocean temperature of 84.9°F (29.4°C).
• Kingshill - September »
  In Kingshill in September, it is raining for 22.8 days, with typically 4.09" (104mm) of accumulated precipitation. In Kingshill, United States Virgin Islands, the average relative humidity in September is 76%.