Last updated: August 28, 2025
Experience the tropical charm of Saint Croix, Virgin Islands, in September, where the average temperature hovers around 28°C (82°F), providing a warm escape from cooler climates. Daytime highs can reach a lovely 29°C (85°F), perfect for sun-soaked adventures. However, be prepared for the humidity at approximately 80%, which enhances the tropical feel. Rainfall is a notable feature this month, with 156 mm (6.2 in) recorded over about 20 days, bringing refreshing showers that nourish the lush landscape. Embrace the vibrant atmosphere, as each rain shower adds to the island's enchanting allure!
In September, Saint Croix, Virgin Islands, experiences warm and tropical temperatures that are hard to resist, with a minimum of 25°C (78°F) and a peak reaching 29°C (85°F). It's a time when the average temperature settles around 28°C (82°F), keeping the island basking in the sun. This month continues the upward trend established in previous summer months, where the temperatures gradually rise, maintaining a delightful warmth perfect for beach escapades and exploration. As the island transitions into October, temperatures remain consistent, suggesting that the summer’s charm lingers just a bit longer in this Caribbean paradise.
In September, Saint Croix, U.S. Virgin Islands, experiences its peak precipitation, receiving a substantial 156 mm (6.2 in) of rainfall over approximately 20 days. This marks a notable increase from the previous months, especially following a humid August, which already set the stage with 123 mm (4.8 in). The trend leading into September indicates a gradual intensification of rainy days, as summer transitions to fall, contributing to the island's lush, tropical landscape. October follows closely with a decrease to 130 mm (5.1 in), yet the prevalence of rain persists, reflecting the region's characteristic wet season. Overall, September stands out as a month where the balance of moisture significantly shifts, underscoring the climatic patterns of this Caribbean paradise.
In Saint Croix, U.S. Virgin Islands, September marks a transition in humidity levels as summer begins to wane. During this month, the average humidity sits at 80%, a slight dip from the peak of 83% reached in July. This progressive decline is reflective of the island's gradual shift toward a cooler autumn season. Historically, humidity in Saint Croix tends to be a consistent feature, hovering around the 77% mark in the winter months and gradually increasing through the summer. As the year progresses, September strikes a balance, offering a taste of both tropical warmth and a hint of relief as the humidity starts to ease into the fall.
In September, Saint Croix, Virgin Islands, experiences one of the highest UV Index readings of the year at 14, placing it firmly in the extreme exposure category with a burn time of just 10 minutes. This trend of high UV levels continues from the peak months of July and August, where the index holds steady at 13, indicating that sun safety precautions remain crucial. As summer transitions into fall, the UV Index begins to decline but still maintains a significant risk throughout October with a value of 12. Overall, the months leading up to September reflect a consistent pattern of extreme sun exposure, making it essential for residents and visitors alike to stay informed about UV risks. For more detailed information, visit Saint Croix UV Index.
UV Risk Categories
As summer gently gives way to autumn, September in Saint Croix shines brightly with an impressive 319 hours of sunshine. This month captures the essence of the Caribbean, as the warm rays continue to grace the island, albeit with a slight dip compared to the peak sunbathing months of May and July, which boast over 360 hours. Interestingly, despite the decreasing trend through the latter half of the year, September maintains a vibrant allure, still surpassing the sunlit hours of October and November. This delightful blend of warmth and light beckons visitors to embrace outdoor adventures, making it clear why this month remains a favorite in the Virgin Islands’ calendar.
In September, the likelihood of sunny weather in Saint Croix, Virgin Islands is a promising 61%, making it a favorable time for sun-seekers. This month benefits from a notable rebound in sunshine compared to the preceding summer months of June and July, which see the sun shine only 23% and 47% of the time, respectively. Interestingly, September's sunshine chances are on par with those of May, suggesting a subtle yet comforting transition toward more favorable weather as the year progresses. As the island moves into the fall, conditions remain relatively bright, outshining April's lows. Thus, visitors can enjoy a delightful blend of warm tropical weather, making September an appealing choice for travel.
As summer fades into autumn, September in Saint Croix sees a steady return to 12 hours of daylight, mirroring the sunlit transitions of May and August. Throughout the year, daylight duration gracefully ebbs and flows, peaking at 13 hours in June and July, the height of the summer season. Following this peak, the island experiences a gradual decline as daylight shifts back to the familiar rhythm of 11 hours by October. This seasonal variability not only highlights the tropical charm of the Virgin Islands but also offers a harmonious balance between long sunlit days and tranquil evenings as the year unfolds.
In September, the winds in Saint Croix, U.S. Virgin Islands soften, with an average speed of only 5.5 m/s (12 mph)—the calmest month of the year. This marked decrease in wind velocity follows the summer months, where gusts typically range between 7.4 m/s (17 mph) and 8.5 m/s (19 mph). As the island transitions into the fall, the gentle breezes of September offer a serene reprieve, contrasting with the more vigorous winds of the preceding months. Overall, this trend of tapering wind speeds not only highlights September's tranquil charm but also sets the stage for the more moderate conditions expected in the ensuing months, making it an ideal time for relaxation and exploration under the warm Caribbean sun.
Weather in Saint Croix varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Saint Croix, focusing on differences in temperature, rainfall, humidity, and UV levels.
In September, the weather is generally warmer and wetter, with temperatures ranging from a minimum of 25°C (78°F) to a maximum of 29°C (85°F) and averaging around 28°C (82°F). This month experiences significant rainfall of 156 mm (6.2 in) over approximately 20 days, accompanied by high humidity levels at 80%.
In contrast, January brings slightly cooler and drier conditions, with temperatures ranging from 23°C (74°F) to 27°C (81°F) and an average of 25°C (78°F). Rainfall decreases significantly to 34 mm (1.3 in) over about 13 days, and humidity is also lower at 77%. For more details on January weather, you can refer to Saint Croix weather in January.
When comparing the weather in September and February, September tends to be warmer and significantly wetter. With temperatures ranging from a minimum of 25°C (78°F) to a maximum of 29°C (85°F) and an average of 28°C (82°F), it is a month characterized by high humidity at 80% and considerable rainfall of 156 mm (6.2 in) over 20 days. In contrast, February offers a slightly cooler climate, with temperatures ranging from 22°C (72°F) to 27°C (81°F) and an average of 25°C (77°F). Precipitation is much lower in February, totaling only 31 mm (1.2 in) across 11 days, and the humidity is marginally less at 77%. This makes February a more pleasant month for outdoor activities compared to the wetter September. For those interested in more specific details, you can explore Saint Croix weather in February.
In September, the weather tends to be hotter and more humid, with average temperatures around 28°C (82°F) and maximums reaching up to 29°C (85°F). The month also experiences significant rainfall, with 156 mm (6.2 in) spread over 20 days, resulting in an average humidity of 80%. In contrast, March offers a slightly cooler climate, with average temperatures around 25°C (77°F) and maximums of 26°C (80°F). Precipitation is significantly lower in March, totaling only 34 mm (1.3 in) over 11 days, and the humidity is also a touch lower at 77%. For a more detailed comparison, you can check out Saint Croix weather in March.
When comparing the weather in September and April, there's a noticeable difference in both temperature and precipitation. September experiences slightly warmer conditions, with a minimum of 25°C (78°F) and an average maximum of 29°C (85°F), while April starts a bit cooler, with a minimum of 23°C (74°F) and a maximum of 28°C (82°F). Additionally, September is much wetter, receiving 156 mm (6.2 in) of rain over 20 days, compared to April's 41 mm (1.6 in) across just 10 days. The humidity levels are relatively close, with September at 80% and April at 78%, making both months feel quite tropical. For more insights, you can check Saint Croix weather in April.
When comparing the weather in September and May, September tends to be warmer and significantly wetter. In September, temperatures range from a minimum of 25°C (78°F) to an average of 28°C (82°F) and a maximum of 29°C (85°F), while May shows slightly cooler temperatures, with a minimum of 24°C (75°F) and an average of 26°C (80°F) peaking at 28°C (83°F). Additionally, September experiences much higher rainfall, with 156 mm (6.2 in) spread over 20 days, compared to May's 57 mm (2.2 in) over just 13 days. Both months have high humidity levels, with September at 80% and May at 79%. For a more detailed look at May's climate, you can visit Saint Croix weather in May.
In comparing the weather patterns of September and June, both months experience similar temperature ranges, with minimums around 25°C (77-25°C or 78-82°F) and maximums peaking at 29°C (84-85°F). However, September tends to be significantly wetter, receiving 156 mm (6.2 in) of precipitation across 20 days, whereas June sees only 59 mm (2.3 in) over 17 days. This results in September having a notably higher humidity level at 80%, compared to June's 81%. For a detailed look at June weather in Saint Croix, check out this link: Saint Croix weather in June.
In comparing the weather between September and July, both months feature similar temperature ranges, with September having an average temperature of 28°C (82°F), just slightly higher than July's average of 27°C (82°F). However, September experiences significantly more rainfall, with a total of 156 mm (6.2 in) over 20 days, in contrast to July's 92 mm (3.6 in) over 19 days. Additionally, humidity levels are slightly lower in July at 83%, compared to September's 80%. For more detailed information on July weather, you can check Saint Croix weather in July.
When comparing the weather in September to that of August, we find that both months maintain similar temperatures, with minimums at around 25°C (77°F), average temperatures at 28°C (82°F), and maximums reaching 29°C (85°F). However, September is noticeably wetter, receiving 156 mm (6.2 in) of precipitation over 20 days, compared to August's 123 mm (4.8 in) across 17 days. Humidity levels remain high in both months, with September at 80% and August slightly higher at 82%. For a more detailed look at the weather trends, you can check Saint Croix weather in August.
In September, temperatures remain relatively warm with a minimum of 25°C (78°F) and an average of 28°C (82°F), peaking at 29°C (85°F). The month sees substantial rainfall, totaling 156 mm (6.2 in) across about 20 days, contributing to a high humidity level of 80%. In contrast, October experiences slightly cooler temperatures, with an average of 27°C (82°F) and similar maximum temperatures, but with reduced precipitation of 130 mm (5.1 in) over 18 days. The humidity decreases just slightly to 79%, making the weather feel a touch more comfortable. For a more detailed look at October weather, visit Saint Croix weather in October.
September weather in Saint Croix is characterized by higher temperatures, with minimums around 25°C (78°F) and maximums reaching 29°C (85°F). The month sees considerable rainfall, totaling 156 mm (6.2 in) over 20 days, accompanied by high humidity levels of 80%. In contrast, November experiences slightly cooler temperatures, with an average of 27°C (81°F) and maximums of 28°C (83°F). Rainfall is also reduced in November, totaling 98 mm (3.9 in) across 17 days, and humidity remains similar at 79%. For a more detailed look at November's weather patterns, check out Saint Croix weather in November.
In September, the weather is typically warmer, with average temperatures around 28°C (82°F) and a maximum of 29°C (85°F), while December sees slightly cooler temperatures with an average of 26°C (79°F) and a maximum of 28°C (83°F). September experiences significantly more rainfall, totaling 156 mm (6.2 in) over 20 days, compared to December's 50 mm (2.0 in) over just 16 days. Despite the slight decrease in temperature from September to December, humidity remains relatively consistent, with September at 80% and December at 78%. For more details on December weather, you can check Saint Croix weather in December.
September in Saint Croix showcases a tropical embrace, characterized by warm temperatures and notable humidity, offering a distinct atmosphere compared to other months. With an average high around 28°C (82°F) and a fair share of rainfall, this month brings a lush vibrancy to the landscape, making it ideal for enjoying the island's natural beauty. Though precipitation may reach its peak with about 20 days of rain, the combination of warmth and humidity can infuse a lively, energetic feel to the island. For those keen on understanding the weather nuances throughout the year, visit Saint Croix Climate for deeper insights.