Last updated: August 28, 2025
September in Charlotte Amalie, Virgin Islands (U.S.) invites visitors to experience tropical warmth and lush landscapes. With maximum temperatures reaching 29°C (85°F) and an average of 28°C (82°F), the weather remains consistently warm. However, the month also sees notable rainfall, accumulating around 161 mm (6.3 in) over 19 days, creating a vibrant, thriving environment. Humidity levels hover at around 79%, contributing to the lush greenery that characterizes this Caribbean paradise. Embrace the tropical feel while enjoying the occasional refreshing shower, as September showcases the beauty of the Virgin Islands in full bloom.
In September, Charlotte Amalie in the U.S. Virgin Islands basks in the warmth of late summer, with temperatures reflecting a delightful consistency. The month opens with a mild minimum of 25°C (77°F) and an inviting average of 28°C (82°F), peaking at a pleasant maximum of 29°C (85°F). This slight upward trend from August indicates that the tropical heat remains steady, creating perfect conditions for beach lovers and outdoor activities. As the calendar turns towards October, you can expect this ideal warmth to linger, making September a fantastic time to experience the vibrant culture and breathtaking scenery of this Caribbean paradise.
In September, Charlotte Amalie experiences a notable peak in precipitation, with 161 mm (6.3 in) of rain falling over 19 days. This significant increase marks September as the wettest month of the year, following an already rainy August that recorded 110 mm (4.3 in). The transition into early autumn typically brings heightened moisture, a trend that sees a steady rise in rainfall from the summer months. Interestingly, this spike in precipitation contrasts sharply with the drier conditions experienced at the year's beginning, where January’s average was just 32 mm (1.3 in). As the season progresses, the rainfall decreases, but September remains a vivid reminder of the Virgin Islands' tropical climate, illustrating the balance between lush landscapes and the Caribbean’s weather patterns.
In September, Charlotte Amalie experiences a notable humidity level of 79%, a slight dip from the summer months of July and August when humidity peaks at 80%. This seasonal transition reflects a gradual cooling as the lush tropical climate begins to shift toward autumn. Overall, the humidity trends in Charlotte Amalie reveal a consistent pattern, with levels hovering in the mid to high 70s throughout the year, reaching their highest points in the heart of summer. As temperatures begin to decrease in October, the humidity follows suit, dropping slightly to 78%, maintaining the island's characteristic warm, sultry atmosphere while hinting at a more comfortable fall season ahead.
As September rolls into Charlotte Amalie, Virgin Islands, residents and visitors alike should be prepared for intensely high UV levels, with the index peaking at 14—the highest for the year. This month, classified under the extreme exposure category, demands vigilance, as the sun's rays can cause skin damage in as little as 10 minutes. Following a summer of consistent high readings, September reflects a continuing trend of elevated UV intensity, echoing the urgent need for sun protection. It's always wise to stay informed about the UV Index to enjoy the Caribbean sun safely. For more details on UV levels throughout the year, check out the Charlotte Amalie UV Index.
UV Risk Categories
September in Charlotte Amalie, Virgin Islands (U.S.) welcomes an impressive 319 hours of sunshine, making it a delightful month to soak up the last rays of summer. As the vibrant atmosphere of late summer begins to transition into fall, sunshine hours remain plentiful but show a slight dip compared to the peak of May with its 358 hours. After the sun-drenched summer months, September's brightness still surpasses the cooler months ahead, including October and November, which average 316 and 302 hours, respectively. This makes September an ideal time for visitors seeking to enjoy warm days and beautiful tropical views before the winter crowd arrives.
In September, Charlotte Amalie experiences a 58% chance of sunny weather, marking a promising transition from the summer months. This likelihood is a slight increase compared to the drier and less sunny July and August, which drop to 47% and 45%, respectively. As the islands begin to cool down post-summer, September offers a favorable balance, presenting a blend of bright, sunny days interspersed with occasional rain. This trend towards clearer skies sets the stage for the following months as October follows closely with a 55% chance of sun, highlighting a return to more reliable sunshine as the island shifts into the fall season.
In Charlotte Amalie, Virgin Islands, the September daylight duration reaches 12 hours, reflecting a balanced transition from the longer days of summer. As the year progresses, we see daylight duration peak at 13 hours during June and July, enchanting residents and visitors alike with abundant sunlight. Following this zenith, the light begins to gradually wane, with hours dropping to 12 in August and September before settling back to 11 hours as autumn approaches in October. This rhythmic ebb and flow of daylight not only influences outdoor activities but also enhances the island's vibrant atmosphere, inviting exploration and relaxation well into the changing seasons.
September in Charlotte Amalie, Virgin Islands brings a noticeable shift in wind patterns, as the average wind speed gently settles at 5.4 m/s (12 mph), marking the year's lowest point. This decline from the bustling breezes of the summer months—July and August recorded average speeds of 8.3 m/s and 7.2 m/s (18 mph and 16 mph) respectively—transforms the atmosphere into a more serene experience. As the island transitions into the autumn months, the winds pick up slightly again, reaching 6.0 m/s (13 mph) in October. Overall, September's tranquil winds encourage visitors to savor the beauty of the Virgin Islands at a leisurely pace, making it an ideal time for relaxation and exploration.
Weather in Charlotte Amalie varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Charlotte Amalie, focusing on differences in temperature, rainfall, humidity, and UV levels.
In September, the weather is notably warmer, with average temperatures reaching around 28°C (82°F) and highs of 29°C (85°F). This month is characterized by significant rainfall, totaling 161 mm (6.3 in) over 19 days, coupled with high humidity levels of 79%. In contrast, January experiences slightly cooler temperatures, with an average of 25°C (78°F) and a maximum of 27°C (80°F). The precipitation drops significantly to 32 mm (1.3 in) spread over 13 days, and the humidity decreases to 76%. For more details on January weather, you can visit Charlotte Amalie weather in January.
In comparing the weather of September and February, September is noticeably warmer, featuring temperatures that range from a minimum of 25°C (77°F) to a maximum of 29°C (85°F), with an average of 28°C (82°F). The month also experiences significant rainfall, with 161 mm (6.3 in) of precipitation over 19 days, leading to a humidity level of 79%. In contrast, February presents milder temperatures, ranging from 22°C (72°F) to 27°C (80°F), with an average of 25°C (77°F). Additionally, February sees considerably less precipitation at 31 mm (1.2 in) over just 11 days and a slightly lower humidity of 75%. For a more detailed look at February weather, you can visit Charlotte Amalie weather in February.
September and March showcase distinct weather patterns. September tends to be warmer, with average temperatures reaching 28°C (82°F), while March is cooler, averaging 25°C (77°F). Additionally, September experiences significantly higher rainfall, with 161 mm (6.3 in) over 19 days compared to March's 38 mm (1.5 in) over just 11 days. Humidity is also slightly higher in September at 79%, compared to 74% in March. For more detailed insights, check out Charlotte Amalie weather in March.
When comparing the weather in September and April, notable differences in temperature and precipitation emerge. September experiences a warmer climate with an average temperature of 28°C (82°F) and maximums reaching up to 29°C (85°F), while April is slightly cooler, boasting an average of 25°C (78°F) and a maximum of 27°C (82°F). Additionally, September sees significantly more rainfall, with 161 mm (6.3 in) over 19 days, compared to April's milder 40 mm (1.6 in) across just 9 days. Humidity levels are relatively similar, with September at 79% and April at 75%. For further details, check out Charlotte Amalie weather in April.
In September, the weather tends to be warmer and more humid compared to May, with average temperatures reaching around 28°C (82°F) and humidity levels at 79%. This month also sees significantly more rainfall, with 161 mm (6.3 in) of precipitation over 19 days. In contrast, May offers slightly cooler temperatures, averaging 26°C (79°F), and enjoys less rainfall, totaling just 58 mm (2.3 in) over 13 days, while maintaining a lower humidity of 75%. For more detailed information, check the Charlotte Amalie weather in May.
In both September and June, the temperature ranges remain quite similar, with minimums around 25°C (77°F) and maximums peaking at 29°C (85°F) in September and 29°C (84°F) in June. However, September is generally wetter, receiving 161 mm (6.3 in) of precipitation over 19 days, compared to June’s 62 mm (2.4 in) over 16 days. Humidity levels are also slightly higher in September at 79%, versus 77% in June, contributing to a more tropical atmosphere. For a more detailed look at the weather in June, you can check out Charlotte Amalie weather in June.
When comparing the weather in September and July, both months exhibit similar temperature ranges, with September having slightly higher average temperatures and maximums. In September, the minimum temperature hovers around 25°C (77°F), with an average of 28°C (82°F) and maximums reaching 29°C (85°F). In contrast, July's temperatures are quite comparable, with a minimum of 25°C (78°F), an average of 27°C (82°F), and a maximum of 29°C (84°F). However, September experiences significantly more precipitation, totaling 161 mm (6.3 inches) over 19 days, compared to July's 92 mm (3.6 inches) with the same number of rainy days. The humidity remains quite similar, with September at 79% and July at 80%. For more detailed information, you can check Charlotte Amalie weather in July.
September weather in Charlotte Amalie shows a slight increase in precipitation compared to August, with 161 mm (6.3 in) of rain falling over 19 days, compared to 110 mm (4.3 in) over 18 days in August. Both months maintain similar temperature averages, with minimums at 25°C (77°F) and maximums at 29°C (85°F). Humidity is slightly lower in September at 79%, compared to 80% in August. For more detailed information about August, you can visit Charlotte Amalie weather in August.
In September, the weather features a warm minimum temperature of 25°C (77°F) and an average temperature of 28°C (82°F), with a maximum reaching 29°C (85°F). The month is quite wet, with 161 mm (6.3 in) of precipitation recorded over 19 days and humidity lingering around 79%.
In comparison, October sees a slight decrease in average temperature to 27°C (82°F), while the minimum and maximum temperatures remain stable at 25°C (77°F) and 29°C (85°F), respectively. Precipitation also decreases to 133 mm (5.2 in) over 17 days, leading to a modest reduction in humidity to 78%. For a more detailed look at the weather conditions during this month, check out Charlotte Amalie weather in October.
September and November exhibit noticeable differences in weather patterns. While September brings warmer temperatures with an average of 28°C (82°F) and a maximum of 29°C (85°F), November experiences slightly cooler conditions, with an average of 27°C (80°F) and a maximum of 28°C (83°F). In terms of precipitation, September is significantly wetter, receiving 161 mm (6.3 in) over 19 days, compared to November's 106 mm (4.2 in) across 17 days. The humidity remains relatively stable, with September at 79% and November slightly lower at 78%. For more details on November's weather in Charlotte Amalie, you can check Charlotte Amalie weather in November.
In September, the weather is noticeably warmer, with temperatures averaging around 28°C (82°F) and reaching a high of 29°C (85°F). The month experiences more rainfall, with a total of 161 mm (6.3 in) spread over 19 days, contributing to a higher humidity level of 79%. In contrast, December sees slightly cooler temperatures, averaging 26°C (79°F) and peaking at 28°C (83°F). Rainfall is significantly reduced to just 50 mm (2.0 in) over 16 days, resulting in a more comfortable humidity level of 76%. For more details on December weather conditions, you can explore Charlotte Amalie weather in December.
As September unfolds in Charlotte Amalie, the weather demonstrates a mix of warmth and moisture, setting it apart from the rest of the year. With average temperatures hovering around 28°C (82°F), it's comfortably warm, yet the month is notably wetter, receiving over 161 mm (6.3 in) of rain across numerous days—19 to be exact. The humidity reaches a peak of 79%, creating a tropical atmosphere that distinguishes September from the drier months earlier in the year. Despite the frequent rainfall, the vibrant beauty of the island remains enchanting, inviting visitors to savor the lush landscape. For more insights on seasonal shifts, explore the detailed climate patterns here: Charlotte Amalie Climate.