Last updated: August 21, 2025
Experience the enchanting September weather of Little Cayman, Cayman Islands, where temperatures typically soar to a maximum of 30°C (86°F) and hover around a pleasant average of 28°C (84°F). The minimum temperature rarely dips below 26°C (78°F), creating a warm island ambiance. While the month brings about 97 mm (3.8 in) of rainfall over approximately 17 days, the humidity level settles at a comfortable 75%, ensuring that the lush landscapes remain vibrant and inviting. Whether you’re seeking adventure or relaxation, September on Little Cayman offers a tropical paradise ideal for all.
In September, Little Cayman experiences warm and inviting temperatures, making it an ideal destination for sun-seekers. With a minimum temperature around 26°C (78°F) and an average of 28°C (84°F), the island remains pleasantly balmy, perfect for beach outings and underwater adventures. The maximum temperature nudges up to 30°C (86°F), mirroring the warmth of the summer months. As summer transitions into fall, September offers a comforting consistency in warmth, reassuring visitors that sunny days and warm nights are still very much a staple of the island's charm. Whether you're diving into the vibrant reefs or lounging on the pristine shores, September's temperatures provide a delightful tropical escape.
In September, Little Cayman experiences a notable shift in precipitation, with 97 mm (3.8 in) of rainfall spread over 17 days. This marks a distinct increase from the drier summer months, particularly August, which recorded slightly higher rainfall at 116 mm (4.6 in) but over fewer days. The uptick in precipitation signals the onset of the wetter season, leading into October's peak of 229 mm (9.0 in). This trend reflects a shift towards tropical downpours as autumn progresses, significantly impacting the island's lush landscapes and vibrant ecosystem. The cumulative rainfall during September reinforces the region's reputation for lush tropical beauty while also highlighting the role of rain in sustaining its natural charm.
September in Little Cayman, Cayman Islands, sees humidity levels stabilize at 75%, aligning with the comfortable averages of the preceding months. This trend reflects a gentle consistency, with humidity gradually fluctuating between 73% and 77% from January through August. As the summer winds down, September maintains this moderate humidity, providing a pleasant atmosphere for both locals and visitors alike. The month heralds a subtle shift toward higher moisture levels, setting the stage for the upcoming wetter months of November and December, which typically experience a marked increase to 78%. Overall, September’s humidity encapsulates the tropical charm of Little Cayman while offering a respite from both extremes.
In September, the UV Index in Little Cayman remains notably high at 12, categorizing the risk of harm from unprotected sun exposure as extreme. This mirrors the pattern established through the summer months, where the Index peaked at similar levels, reflecting consistently intense solar radiation in this tropical paradise. With a swift burn time of only 10 minutes, it’s essential for visitors and residents alike to take precautions to protect their skin. As the year progresses into the autumn months, a slight dip to 11 follows in October, yet the focus remains on the need for sun safety with such elevated readings. For more details on UV exposure throughout the year, explore the Little Cayman UV Index.
UV Risk Categories
As September rolls in, Little Cayman continues to bask in abundant sunshine, enjoying an impressive 325 hours of bright daylight. This month follows a summer of peak sunshine, peaking in July with 352 hours, and remains close to August's 337 hours. The gradual decline in daylight from the summer months signals the transition into autumn, yet this lingering warmth offers a perfect backdrop for outdoor adventures and relaxation by the turquoise waters. Overall, while daylight hours may be tapering, the vibrant energy of September in the Cayman Islands invites both locals and visitors to relish the superb weather before the year starts to wind down.
In September, Little Cayman enjoys a 55% chance of sunny weather, marking a consistent trend with the preceding months of January and July, which both also reflect the same likelihood. This statistic positions September intriguingly between the mid-summer months and the onset of autumn, suggesting it can still offer delightful sunny intervals amidst occasional tropical showers. As we transition into the later months, the likelihood dips further, with October and November seeing lower chances of sunshine. Thus, September remains a balanced choice for sun-seekers, providing a mix of bright days to relish before the weather shifts.
As summer fades into autumn, September in Little Cayman, Cayman Islands, offers a delightful balance with 12 hours of daylight. Following the long, sun-soaked days of June, July, and August—when residents bask in a generous 13 hours of sunshine—the daylight duration begins a gradual decline. This rhythm reflects the transition from the vibrant summer months into the slightly shorter days of fall. While September may not boast the longest hours of light, it still provides ample time for beach adventures and sunset strolls, ensuring that this serene island paradise remains a luminous escape.
As summer transitions to autumn in Little Cayman, the September winds whisper a gentler tune, with average wind speeds dipping to 4.2 m/s (9 mph)—the lowest of the year. This marks a noticeable shift from the stronger breezes of earlier months, where wind speeds generally hovered between 5.3 m/s and 6.5 m/s. Following the summer months, which held steady winds ideal for sailing and other water sports, September offers a quieter atmosphere, perfect for relaxation. As the winds begin to pick up again in October, returning to 4.6 m/s (10 mph), the island prepares for a transition back to more dynamic conditions, hinting at the return of invigorating breezes as the year draws to a close.
Weather in Little Cayman varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Little Cayman, focusing on differences in temperature, rainfall, humidity, and UV levels.
In September, the weather is characterized by warmer temperatures, with a minimum of 26°C (78°F) and an average of 28°C (84°F), reaching a peak of 30°C (86°F). This month also experiences higher precipitation, totaling 97 mm (3.8 in) over 17 rainy days, alongside a humidity level of 75%. Conversely, January offers a milder climate, with temperatures ranging from a minimum of 20°C (69°F) to an average of 26°C (78°F) and a maximum of 28°C (82°F). This month sees significantly less rainfall, with only 36 mm (1.4 in) falling over 8 days and a slightly higher humidity at 77%. For further details, check out Little Cayman weather in January.
September weather is characterized by warmer temperatures, with a minimum of 26°C (78°F) and an average of 28°C (84°F), peaking at a maximum of 30°C (86°F). The month experiences significant rainfall, with 97 mm (3.8 in) of precipitation spread over 17 days, resulting in a high humidity level of 75%. In contrast, February offers slightly cooler temperatures, with a minimum of 22°C (71°F), an average of 26°C (79°F), and a maximum of 27°C (81°F). Precipitation decreases significantly to 25 mm (1.0 in) over just 7 days, and humidity remains relatively high at 76%. For a more detailed look at February weather, you can visit Little Cayman weather in February.
September and March exhibit distinct weather patterns, reflecting the transition from summer to fall in the tropics. In September, the temperatures are warmer, with a minimum of 26°C (78°F) and a maximum reaching 30°C (86°F), while March offers slightly cooler temperatures, ranging from a minimum of 23°C (73°F) to a maximum of 28°C (83°F). Additionally, September experiences significantly more rainfall, with 97 mm (3.8 in) spread over 17 days, compared to March's modest 19 mm (0.8 in) over just 5 days. Humidity levels remain quite similar, hovering around 75% in September and 74% in March, making both months feel quite tropical. For more insights on what to expect, visit Little Cayman weather in March.
When comparing the weather in September and April, we notice significant differences in temperature and precipitation patterns. In September, temperatures range from a minimum of 26°C (78°F) to a maximum of 30°C (86°F) with an average of 28°C (84°F), while April sees slightly cooler temperatures, with minimums at 24°C (75°F) and maximums at 28°C (84°F), averaging 26°C (80°F). Additionally, September experiences much higher precipitation, totaling 97 mm (3.8 in) over 17 days, compared to April's milder 35 mm (1.4 in) across just 6 days. Despite both months having a consistent humidity level of 75%, the overall climate in September is notably wetter and warmer. For more information, you can check Little Cayman weather in April.
When comparing the weather in September and May, we can see some notable differences. September typically has slightly warmer temperatures, with minimums around 26°C (78°F) and maximums reaching 30°C (86°F), while May starts a bit cooler with minimums at 24°C (75°F) and maximums at 29°C (84°F). Precipitation levels are higher in May, totaling 131 mm (5.2 in) over 18 days compared to September's 97 mm (3.8 in) over 17 days, which almost results in a similar number of rainy days. Additionally, humidity remains quite high in both months, at 75% for September and slightly lower at 73% for May. For more detailed information on weather specifics during May, check out Little Cayman weather in May.
In comparing the weather between September and June, both months feature similar average temperatures, with September showing a minimum of 26°C (78°F) and an average of 28°C (84°F), while June experiences a minimum of 25°C (77°F) and an average of 28°C (83°F). However, September tends to be slightly more humid, at 75% compared to June's 73%. Additionally, September receives more precipitation, with 97 mm (3.8 in) over 17 days, contrasting with June's 61 mm (2.4 in) over just 12 days. For a detailed look at June weather, you can visit Little Cayman weather in June.
When comparing the weather in September to that of July, we observe a slight increase in temperatures. September has an average temperature of 28°C (84°F) with a maximum of 30°C (86°F), while July's averages are a bit higher, peaking at 31°C (88°F). Precipitation levels are notably different; September experiences more rainfall with 97 mm (3.8 in) spread over 17 days, compared to July's 52 mm (2.0 in) over 12 days. Humidity remains consistent at 75% for both months. For more detailed insights, you can check Little Cayman weather in July.
In comparing the weather between August and September, we see similar temperature ranges, with minimums hovering around 26°C (78°F) and maximums reaching 30°C (86°F) in both months. However, September tends to have a slightly lower average temperature of 28°C (84°F) compared to August's 29°C (84°F). Precipitation increases in September, totaling 97 mm (3.8 in) over 17 days, whereas August sees slightly higher rainfall at 116 mm (4.6 in) over 15 days. Both months maintain a consistent humidity level of 75%. For more details about August's weather, you can visit Little Cayman weather in August.
September and October weather in Little Cayman show slight variations in temperature and increased precipitation. In September, temperatures range from a minimum of 26°C (78°F) to a maximum of 30°C (86°F), with an average of 28°C (84°F). The month sees 97 mm (3.8 in) of rainfall across 17 days, while humidity remains steady at 75%. In contrast, October experiences a similar temperature range, with a minimum of 25°C (78°F), an average of 28°C (82°F), and a maximum of 30°C (85°F). However, rainfall significantly increases to 229 mm (9.0 in) over 23 days, maintaining the same humidity level of 75%. For more detail on the weather in October, visit Little Cayman weather in October.
In September, the weather is typically warm with temperatures ranging from a minimum of 26°C (78°F) to a maximum of 30°C (86°F), and an average of 28°C (84°F). The month experiences around 97 mm (3.8 in) of rain over 17 days, with a humidity level of about 75%. In contrast, November brings slightly cooler temperatures, with a minimum of 24°C (76°F) and a maximum of 29°C (85°F), averaging 27°C (81°F). However, it is also wetter, with precipitation reaching 160 mm (6.3 in) over 15 days, and humidity increasing to 78%. For more detailed insights, you can check the Little Cayman weather in November.
September and December exhibit noticeable differences in weather patterns. In September, temperatures range from a minimum of 26°C (78°F) to a maximum of 30°C (86°F), with an average of 28°C (84°F). This month experiences significant rainfall, with a total precipitation of 97 mm (3.8 in) over 17 rainy days and a humidity level of 75%. In contrast, December sees milder conditions, with temperatures ranging from a minimum of 22°C (72°F) to a maximum of 28°C (83°F) and an average of 26°C (80°F). Precipitation drops to 38 mm (1.5 in) over 11 days, and humidity increases slightly to 78%. Overall, December tends to be cooler and drier compared to the more humid and wetter September. For more details, check Little Cayman weather in December.
September in Little Cayman ushers in a unique blend of warm temperatures and increased humidity, making it a distinctive month compared to the summer peak. With average highs resting around 28°C (84°F), visitors can expect delightful tropical warmth, but be prepared for an uptick in rainfall, as this month typically sees 17 days of precipitation. While the island's lush vegetation thrives, travelers should anticipate a feeling of muggy air brought on by the 75% humidity level. For those considering a visit during this time, embracing the potential for rain may lead to discovering the island’s hidden beauty. For a comprehensive overview of what to expect year-round, visit Little Cayman Climate.