Last updated: August 31, 2025
In September, Gros Islet in Saint Lucia experiences warm tropical weather, with maximum temperatures reaching a balmy 32°C (90°F) and an average of 28°C (83°F). The nights remain comfortable, dipping to a minimum of 25°C (76°F). This month is characterized by increased precipitation, accumulating around 121 mm (4.8 in) over approximately 19 days, contributing to the region's lush landscape. Visitors can expect a high humidity level of 80%, enhancing the tropical ambiance, making it an inviting time for those seeking a vibrant yet humid escapade.
In Gros Islet, Saint Lucia, September ushers in a slight warmth, with temperatures reflecting the peak of the Caribbean summer. The minimum temperature rises to 25°C (76°F), while the average settles comfortably at 28°C (83°F), nudging toward the maximum of 32°C (90°F). This month illustrates a clear trend of increasing warmth, following the pattern established in August, where similar highs were achieved. The consistent warmth throughout the month makes September an inviting time for beach lovers and sun-seekers, promising balmy days and warm nights that are perfect for outdoor activities and relaxation by the sea.
September in Gros Islet, Saint Lucia, marks a notable peak in precipitation, with an average of 121 mm (4.8 in) over 19 days of rain. This increase continues the trend set in the preceding months, particularly from July and August, which saw the onset of the rainy season with 105 mm (4.1 in) and 113 mm (4.5 in) respectively. As summer transitions to fall, September's rainfall outpaces earlier months, indicating a significant escalation in wet weather. The subsequent rise to 128 mm (5.1 in) in October also suggests that the region remains firmly within its wettest season, accentuating the lush landscapes that characterize this vibrant tropical locale. This trend highlights the importance of preparation for those visiting during these heavier rainfall months, as nature flourishes in response to the abundant moisture.
In Gros Islet, Saint Lucia, September experiences a moderate humidity level of 80%, continuing the trend of consistent moisture prevalent throughout the year. The humidity in this lively destination peaks during the warmer summer months, reaching 84% in July before settling back to 80% in September. Interestingly, the humidity is relatively stable across the year, with values hovering between 79% and 84%. This consistent moisture contributes to the lush landscapes and vibrant ecosystems that define the island, making it an inviting retreat for those who revel in tropical climates. As the month transitions into October, a slight rise to 82% hints at the upcoming shift toward a more humid spell, characteristic of the Caribbean region.
In September, Gros Islet experiences an extreme UV Index of 14, maintaining the high levels seen throughout the summer months. This trend indicates a persistent threat for sunburn, with a burn time of just 10 minutes for unprotected skin. Following the peak intensity in March through August, where UV levels consistently marked at 14, September sustains this intensity, reminding visitors to take necessary precautions against sun exposure. As the month transitions into October, there's a slight decrease to an Index of 12, yet the extreme classification remains. To stay safe and enjoy the vibrant sunshine, check out the detailed Gros Islet UV Index for more information and tips.
UV Risk Categories
As September dawns in Gros Islet, Saint Lucia, the island basks in an impressive 319 hours of sunshine, adding a radiant glow to the month. While slightly below the peak brightness of May's 355 hours, September still maintains a robust display of sunshine, continuing a trend of abundant daylight established earlier in the year. As summer transitions to autumn, the hours of sunlight gently taper off from the highs of mid-year, yet September still offers a delightful blend of warmth and light, inviting visitors to savor the lush landscapes and vibrant culture. This month serves as a perfect bridge, encapsulating the essence of the Caribbean's sunny allure while hinting at the cozy charm of the approaching months.
In Gros Islet, Saint Lucia, September offers a moderate chance of sunshine, with about 51% likelihood of clear skies. This marks a subtle rebound from the summer months, where the sun's presence dips to a low of 29% in June. As autumn approaches, the trend shifts slightly upwards, with opportunities for sun becoming more promising than in the peak of summer. Interestingly, September's sunny potential aligns closely with both January and October, hinting at a season of transition where beachgoers can still enjoy favorable weather. Overall, while September might not boast the highest chances of sunshine, it certainly provides a delightful balance of warmth and daylight, perfect for those looking to escape into paradise.
In Gros Islet, Saint Lucia, September continues the trend of generous daylight that characterizes the region's mid-year months. With 12 hours of daylight, this marks a seamless transition from the vibrant summer months of June through August, where daylight remained consistently at 12 hours. Following September, the daylight gradually diminishes, dropping to 11 hours in October and continuing through the rest of the year. This consistent pattern highlights the tropical nature of the island, where long, sunlit days are a hallmark of life, allowing residents and visitors alike to bask in the lush beauty of the Caribbean.
As the balmy days of September settle over Gros Islet, the average wind speed takes a gentle dip to 3.9 m/s (9 mph), marking one of the calmest months of the year. This trend reflects a gradual decline from the breezy heights of February and March, where winds averaged around 7.3 m/s (16 mph), down to more tranquil breezes by late summer. The softening of winds in September contrasts notably with the more vigorous gusts of July and August, prompting a serene atmosphere perfect for relaxation. As the island prepares to transition into October, where the wind picks up again to 5.6 m/s (13 mph), September serves as a beautiful interlude—ideal for enjoying the tranquil beauty of Saint Lucia’s shores.
Weather in Gros Islet varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Gros Islet, focusing on differences in temperature, rainfall, humidity, and UV levels.
September weather is characterized by warmer temperatures, with a minimum of 25°C (76°F) and an average of 28°C (83°F), reaching a maximum of 32°C (90°F). In contrast, January experiences slightly cooler temperatures, with a minimum of 22°C (72°F) and an average of 26°C (78°F), peaking at 30°C (86°F). Additionally, September sees significantly more precipitation, with 121 mm (4.8 in) over 19 days, compared to just 36 mm (1.4 in) over 15 days in January. Humidity levels remain high in both months, with September at 80% and January slightly higher at 81%. For more detailed insights on January weather, you can visit Gros Islet weather in January.
When comparing the weather in September and February, notable differences emerge. September typically sees warmer temperatures, with minimums around 25°C (76°F) and maximums reaching 32°C (90°F), while February offers slightly cooler conditions, with a minimum of 21°C (71°F) and a maximum of 30°C (86°F). Additionally, September experiences significantly higher precipitation, totaling 121 mm (4.8 in) over 19 days, compared to just 33 mm (1.3 in) over 12 days in February. Both months share a consistent humidity level of 80%, contributing to the tropical feel throughout the year. For more detailed insights into February's weather, visit Gros Islet weather in February.
In comparing the weather between September and March, we can see notable differences in temperature and precipitation. September typically enjoys warmer temperatures, with a minimum of 25°C (76°F), an average of 28°C (83°F), and a maximum of 32°C (90°F). In contrast, March experiences slightly cooler conditions, with a minimum of 22°C (72°F), an average of 26°C (79°F), and a maximum of 30°C (85°F). Additionally, September is significantly wetter, receiving 121 mm (4.8 in) of precipitation over 19 days, while March has only 38 mm (1.5 in) across 15 days. Despite the differences in rainfall, both months maintain a consistent humidity level of 80%. For more detailed information on the weather patterns in March, check out Gros Islet weather in March.
In comparing the weather of September and April, September tends to be warmer overall, with average temperatures peaking at 28°C (83°F) compared to April's average of 26°C (80°F). While both months experience high humidity, with September at 80% and April slightly lower at 79%, precipitation levels reveal a significant contrast. September sees much more rain, accumulating 121 mm (4.8 in) over 19 days, whereas April only receives 35 mm (1.4 in) across 14 days. For a more detailed look at the weather patterns for this time of year, you can visit Gros Islet weather in April.
When comparing the weather in September to that in May, we see a few notable differences. September typically experiences slightly warmer temperatures, with a minimum of 25°C (76°F) and an average of 28°C (83°F), while May's temperatures range from a minimum of 23°C (74°F) and an average of 27°C (81°F). Additionally, September is significantly wetter, receiving 121 mm (4.8 in) of precipitation over 19 days, compared to May's 39 mm (1.6 in) over just 13 days. Both months share a consistent humidity level of 80%, making the air feel equally muggy. To explore more about the weather conditions in May, check out this link: Gros Islet weather in May.
In comparing the weather between September and June, we see that September tends to be slightly warmer, with average temperatures ranging from a minimum of 25°C (76°F) to a maximum of 32°C (90°F), while June has a minimum of 24°C (75°F) and a maximum of 31°C (88°F). Precipitation is notably higher in September, with 121 mm (4.8 in) over 19 days, compared to June's 65 mm (2.6 in) over 16 days. Additionally, September has a humidity level of 80%, slightly lower than June's 83%. For a more detailed look at June's climate, you can check out Gros Islet weather in June.
In comparing the weather between September and July, it's evident that both months experience warm temperatures, with September having slightly higher averages. In September, the minimum temperature hovers around 25°C (76°F) with an average of 28°C (83°F), while July's average is a bit lower at 27°C (81°F). July tends to have marginally less rainfall, recording 105 mm (4.1 in) compared to September’s 121 mm (4.8 in), although it also has more rainy days at 24 compared to September's 19. Humidity levels are slightly higher in July at 84%, compared to 80% in September. For more specific insights, you can explore Gros Islet weather in July.
In comparing the weather between August and September, we see that September is slightly warmer with an average temperature of 28°C (83°F) compared to August's 28°C (82°F). Both months experience similar temperature ranges, with September reaching a maximum of 32°C (90°F) and August peaking at 31°C (89°F). Regarding precipitation, September sees a slight increase in rainfall at 121 mm (4.8 in) over 19 days, while August totals 113 mm (4.5 in) over 25 days, indicating that August is typically wetter despite having less overall precipitation. Humidity levels remain relatively consistent, with September at 80% and August at 81%. For a more detailed look at August weather, you can check Gros Islet weather in August.
In comparison to September, October tends to be slightly cooler, with average temperatures dropping from 28°C (83°F) to 27°C (81°F). Both months share similar maximum temperatures of around 32°C (90°F) for September and 32°C (89°F) for October, while the minimum temperature remains relatively stable at 25°C (76°F) in September and 24°C (76°F) in October. Precipitation slightly increases in October, recorded at 128 mm (5.1 in) over 21 days, compared to 121 mm (4.8 in) over 19 days in September, resulting in marginally higher humidity levels of 82% in October, up from 80% in September. For more specific details about October conditions in this region, you can visit Gros Islet weather in October.
September and November exhibit similar warm temperatures, with September featuring a slight edge in maximum temperatures at 32°C (90°F) compared to November's 31°C (87°F). Both months experience significant humidity, although November is marginally higher at 83% versus September's 80%. Precipitation is relatively high in both months; however, September receives more rainfall overall with 121 mm (4.8 in) across 19 days, while November records 103 mm (4.1 in) spread over 21 days. For more details on the weather conditions during November, you can check Gros Islet weather in November.
In September, temperatures range from a minimum of 25°C (76°F) to a maximum of 32°C (90°F), with an average of about 28°C (83°F), making it notably warmer than December, which sees temperatures starting at a minimum of 22°C (72°F) and peaking at 30°C (86°F) with an average of 26°C (80°F). Additionally, September experiences higher precipitation, accumulating 121 mm (4.8 in) over 19 days, whereas December sees only 46 mm (1.8 in) across 16 days. Humidity levels remain relatively similar in both months, with September at 80% and December slightly higher at 82%. For more specific details, you can check Gros Islet weather in December.
In September, Gros Islet experiences a unique blend of warm tropical weather characterized by a maximum temperature that often peaks at a balmy 32°C (90°F), making it one of the warmer months of the year. However, this sunny paradise also faces heightened humidity levels and an increased chance of rain, with 19 days seeing some form of precipitation, totaling 121 mm for the month. Unlike the drier months preceding it, the occasional showers provide a refreshing contrast to the heat, enhancing the lush landscape. For those curious about the overall climatic patterns, more information can be found in the detailed guide on Gros Islet Climate.