Last updated: August 21, 2025
Experience the tropical allure of Falmouth, Antigua and Barbuda in September, where the island welcomes you with average temperatures hovering around 28°C (82°F). While the maximum daily highs reach up to 29°C (85°F), evenings offer a pleasant respite with minimum temperatures dipping to 25°C (77°F). This month sees an average humidity level of 80%, creating a lush and vibrant atmosphere. However, be prepared for some rain, as 144 mm (5.7 in) of precipitation is spread across 21 days, adding refreshing bursts to your sun-kissed adventures. Embrace the beauty of this Caribbean paradise, where each day is filled with a blend of warmth and tropical charm.
In September, Falmouth, Antigua and Barbuda, showcases warm tropical temperatures that are characteristic of the late summer months. With minimum temperatures around 25°C (77°F) and averages climbing to 28°C (82°F), the heat is palpable. The maximums can reach up to 29°C (85°F), keeping the warmth consistent throughout the day while hinting at a gradual transition into the cooler autumn months. This slight rise in temperature compared to the previous months reflects the region's typical climatic patterns, where summer's peak gradually eases into the fall. The pleasant warmth makes September an inviting time to explore the island’s stunning beaches and vibrant culture, even as the season begins to shift.
In September, Falmouth, Antigua and Barbuda, experiences a significant surge in rainfall, with an average precipitation of 144 mm (5.7 in) spread over 21 days. This marks a noteworthy increase from the preceding months, particularly following the dry spell in early summer. The trend reveals that June and July, while they begin the rainy season with moderate totals of 52 mm (2.0 in) and 81 mm (3.2 in) respectively, set the stage for August's escalation to 97 mm (3.8 in). However, it is September that truly showcases the peak of the wet season, indicating a pattern of heightened rainfall as the year progresses into the latter months. As the island transitions into October, the precipitation begins to taper off to 109 mm (4.3 in), yet September remains a pivotal month in understanding the region's climatic rhythm.
In September, Falmouth, Antigua and Barbuda experiences a comfortable humidity level of 80%, which is a slight drop from the peak of 84% seen in July. This month sits at the tail end of the summer, transitioning into a more moderate fall climate. As the year progresses, humidity levels gradually fluctuate; starting at a lower 76% in February, they rise steadily through the warmer months, reaching a high in July and August. Following September, humidity dips slightly to 79% in October, suggesting a gradual easing of the summer's mugginess as winter approaches. The overall trend highlights a pattern of increasing humidity during the warmer months, with September serving as a pivotal point before the slight decline towards the end of the year.
In September, Falmouth, Antigua and Barbuda, experiences a UV Index of 13, categorized as extreme, indicating that sun safety is crucial during outdoor activities. This month mirrors the intensity of the preceding summer, with a consistent burn time of just 10 minutes. The UV Index remains elevated from the earlier months of the year, establishing a trend of severe sun exposure risk that stretches from February through October. As the days transform toward autumn, it's vital to remain vigilant about skin protection, ensuring you shield yourself from the sun's powerful rays. For detailed information and daily updates, visit the Falmouth UV Index.
UV Risk Categories
As summer transitions into autumn, September in Falmouth, Antigua and Barbuda, continues to bask in vibrant sunshine, offering 321 hours of glorious daylight. This marks a slight dip from the sun-soaked heights of July and May, which recorded the highest sunshine hours at 361 and 357 respectively. Nevertheless, September shines brightly compared to the months that precede it, comfortably sitting above the 300-hour mark. This trend showcases a gradual decline in daylight hours as the year progresses, but beachgoers and sun-lovers can still relish the warm, sunny days that make this Caribbean paradise a cherished destination.
In September, Falmouth, Antigua and Barbuda enjoys a 58% chance of sunny weather, making it one of the more favorable months for sunshine after the rainy summer. This percentage aligns closely with the probabilities observed in the earlier months of the year, particularly January and October, both of which also boast similar sunny outlooks. As we transition from the wet season, the likelihood of blue skies increases, offering a harmonious blend of warmth and brightness just before the cooler and drier months set in. Overall, September presents a pleasant opportunity for sun-seekers to revel in the Caribbean’s coastal beauty.
In Falmouth, Antigua and Barbuda, September boasts approximately 12 hours of daylight, maintaining the trend experienced over the previous months of summer. The island enjoys a gradual increase in daylight from 11 hours in January and February to its peak with 13 hours in June and July. As summer transitions into fall, daylight duration stabilizes at 12 hours for both August and September before dipping back to 11 hours in the following months. This consistent daylight pattern not only enhances the vibrant atmosphere of the island but also allows residents and visitors alike to maximize their outdoor experiences as the seasons change. Whether soaking up the sun on a beach or exploring lush landscapes, September offers a wonderful blend of warmth and light to enjoy the natural beauty of this Caribbean paradise.
In September, Falmouth, Antigua and Barbuda experiences a notable dip in wind speeds, averaging just 5.2 m/s (12 mph), making it one of the calmest months of the year. This decline follows a bustling summer, where winds peaked in July at 8.3 m/s (19 mph), inviting a lively atmosphere for sailing and water activities. As September rolls in, the gentle breezes provide a serene backdrop, allowing visitors to savor the tranquil beauty of the island. The transition into October sees a slight uptick to 6.5 m/s (15 mph), suggesting a return to the more dynamic wind patterns that characterize the Caribbean. Overall, September’s soft winds create an idyllic setting for relaxation and exploration, contrasting sharply with the more vigorous conditions of the preceding months.
Weather in Falmouth varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Falmouth, focusing on differences in temperature, rainfall, humidity, and UV levels.
September and January showcase distinct weather characteristics. In September, temperatures 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 is notably wetter, receiving 144 mm (5.7 inches) of rainfall over 21 days, accompanied by high humidity levels of 80%. In contrast, January experiences milder temperatures, with a range from 23°C (73°F) to 27°C (80°F), averaging 25°C (78°F). Precipitation is significantly lower at 34 mm (1.4 inches) over just 12 days, and humidity is slightly reduced at 77%. For more details, you can check Falmouth weather in January.
In comparing the weather of September and February, September tends to be hotter and wetter. With average temperatures reaching 28°C (82°F) and a high of 29°C (85°F), September experiences a min temperature of 25°C (77°F). Additionally, it sees significant rainfall, amounting to 144 mm (5.7 in) across 21 days, coupled with a high humidity level of 80%. In contrast, February enjoys slightly cooler conditions, with an average temperature of 25°C (77°F) and a max of 26°C (80°F), alongside a lower minimum temperature of 22°C (72°F). February also experiences much less rain, with only 36 mm (1.4 in) over 14 days and slightly lower humidity at 76%. For a more detailed look at February weather patterns, you can check Falmouth weather in February.
September weather tends to be warmer and more humid compared to March, with average temperatures reaching around 28°C (82°F) and humidity levels at 80%. This month experiences significantly higher precipitation, with 144 mm (5.7 inches) over 21 days, contributing to a much wetter climate. In contrast, March typically boasts milder temperatures, averaging 25°C (77°F) with a maximum of 26°C (80°F) and lower humidity at 76%. The precipitation in March is also minimal, at just 31 mm (1.2 inches) over 11 days, making it a drier month overall. For a more detailed look at March weather, you can visit Falmouth weather in March.
In comparing the weather between September and April, September is notably warmer, with temperatures ranging from a minimum of 25°C (77°F) to a maximum of 29°C (85°F) and an average temperature of 28°C (82°F). In contrast, April experiences slightly cooler temperatures, with a minimum of 23°C (74°F), an average of 25°C (78°F), and a maximum of 27°C (82°F). Additionally, September is much wetter, receiving 144 mm (5.7 in) of rainfall over 21 days, whereas April sees significantly less precipitation at 38 mm (1.5 in) over just 14 days. Humidity levels are also high in both months, with September at 80% compared to April’s 78%. For more detailed insights, you can explore Falmouth weather in April.
September and May exhibit similar average temperatures, with September slightly warmer, featuring an average temperature of 28°C (82°F) compared to May's 26°C (79°F). However, September is markedly wetter, with 144 mm (5.7 in) of precipitation over 21 days, significantly higher than May's 49 mm (1.9 in) over just 15 days. Humidity levels remain comparable, with September at 80% and May at 79%, making both months feel quite muggy. For more detailed insights on May weather, you can visit Falmouth weather in May.
Comparing the weather in September and June reveals some notable differences. September tends to be slightly warmer, with an average temperature of 28°C (82°F) compared to June's average of 27°C (80°F). However, September also experiences significantly more rainfall, with a total of 144 mm (5.7 inches) across 21 days, while June only sees 52 mm (2.0 inches) over 14 days. Humidity levels remain quite similar, with September at 80% and June at 81%. For a detailed look at June weather, you can visit Falmouth weather in June.
When comparing the weather in September and July, both months share similar temperature ranges, with September slightly warmer on average at 28°C (82°F) compared to July's 27°C (81°F). However, September experiences significantly higher precipitation, totaling 144 mm (5.7 in) over 21 days, whereas July sees only 81 mm (3.2 in) over 19 days. The humidity is also slightly higher in July at 84% compared to September's 80%. For more detailed insights, you can check Falmouth weather in July.
In comparing the weather patterns of September and August, we see that both months maintained warm temperatures, with September averaging around 28°C (82°F) and August slightly cooler at 27°C (82°F). Notably, both months experienced similar minimum and maximum temperatures, with September's maximum reaching up to 29°C (85°F) and August peaking at 29°C (84°F). However, September was significantly wetter, receiving 144 mm (5.7 in) of precipitation over 21 days compared to August's 97 mm (3.8 in) over 18 days. Additionally, humidity levels were slightly lower in August at 83%, while September saw an increase to 80%. For more localized details, you can check out Falmouth weather in August.
In September, the weather features warm temperatures with a minimum of 25°C (77°F) and an average of 28°C (82°F), peaking at a maximum of 29°C (85°F). This month experiences significant rainfall, totaling 144 mm (5.7 in) over 21 days, coupled with high humidity at 80%. In contrast, October brings slightly cooler conditions with an average temperature of 27°C (81°F), while still maintaining a minimum of 25°C (77°F) and a maximum of 29°C (85°F). Rainfall decreases to 109 mm (4.3 in) across 18 days, and humidity levels drop marginally to 79%. For a detailed look at the weather in October, you can check Falmouth weather in October.
In September, the weather tends to be warmer with temperatures ranging from a minimum of 25°C (77°F) to a maximum of 29°C (85°F), averaging around 28°C (82°F). This month experiences significant rainfall, with 144 mm (5.7 in) spread over 21 days, while humidity remains high at 80%. In contrast, November sees slightly cooler temperatures, with a minimum of 24°C (76°F) and a maximum of 28°C (83°F), averaging 27°C (80°F). Precipitation in November decreases to 94 mm (3.7 in) over 17 days, while humidity stays consistent at 80%. For more information on the weather specifics in November, you can check out Falmouth weather in November.
In September, the weather is characterized by warmer temperatures, with a minimum of 25°C (77°F) and an average of 28°C (82°F), peaking at a maximum of 29°C (85°F). It experiences significant precipitation, totaling 144 mm (5.7 in) over 21 days, and maintains high humidity levels around 80%. In contrast, December offers a slightly cooler climate with temperatures ranging from a minimum of 24°C (75°F) to an average of 26°C (79°F) and a maximum of 28°C (82°F). Precipitation in December is much lower at 52 mm (2.1 in) over 18 days, contributing to a slight decrease in humidity to 78%. For more details, you can check out Falmouth weather in December.
As September unfolds in Falmouth, it showcases a distinct shift in weather patterns compared to other months. With average temperatures remaining warm, the air carries a notable humidity that can make even the balmiest days feel more intense. This month also experiences a significant uptick in precipitation, as rain graces the shores on many days, contributing to the lush tropical landscape. While still offering ample sunshine, September stands out with its dynamic climate, making it a unique time to experience Falmouth’s vibrant atmosphere. For more detailed insights, explore the full Falmouth Climate.