Last updated: August 27, 2025
Experience the charm of Ko Lanta, Thailand in September, where the tropical climate brings warm temperatures and inviting breezes. With a maximum of 29°C (85°F) and an average of 27°C (82°F), visitors can expect pleasant weather, though the month is marked by significant rainfall, totaling 306 mm (12.0 in) over 24 days. Humidity levels hover around 84%, adding to the lush, vibrant atmosphere of this island paradise. Whether exploring the stunning beaches or relaxing amidst nature, September on Ko Lanta offers a unique blend of warmth and refreshing rain.
In September, Ko Lanta experiences a gentle transition in temperatures, maintaining a warm tropical allure. The month sees minimums around 25°C (78°F) and averages of 27°C (82°F), making it pleasantly warm for beachgoers. As the maximums reach 29°C (85°F), this period offers a slight dip compared to the hotter earlier months. While September is nestled within the rainy season, the temperatures remain inviting, encouraging visitors to explore the island's lush landscapes and vibrant culture amidst the occasional downpour. Overall, the comforting warmth makes September a charming time to immerse in the tranquil beauty of Ko Lanta.
As the monsoon season reaches its peak, September in Ko Lanta, Thailand, experiences the highest precipitation of the year, with an impressive 306 mm (12.0 in) of rainfall over approximately 24 days. This significant uptick in both total rainfall and rainy days marks a transition from the relatively drier months that precede it, such as August and July. The lush landscapes come alive, transforming the island into a vibrant oasis, while also offering a unique opportunity for visitors to witness the power of nature. September not only highlights the breathtaking beauty of Ko Lanta but also signifies the importance of rain in replenishing local ecosystems, setting the stage for the lush scenery that characterizes this tropical paradise.
September in Ko Lanta, Thailand, marks the peak of humidity, with levels rising to 84%. This increase follows a summer of consistently high moisture, as the preceding months of July and August recorded 79% and 82% humidity, respectively. The trend shows that as the year progresses into the latter months, particularly from June onward, humidity levels maintain a high average, creating a lush, tropical environment. This consistent humidity, especially in September, not only enhances the island's vibrant scenery but also sets the stage for the beginning of the rainy season, making it a unique time to experience Ko Lanta's natural beauty.
In September, Ko Lanta, Thailand, experiences a UV Index of 14, maintaining its position in the extreme exposure category. This trend of high UV levels continues from the summer months, where the index peaked at 15 in March and April, gradually settling to 14 in both August and September. With a consistent burn time of just 10 minutes, it's crucial for visitors to remain vigilant about sun protection during this period. As the year transitions toward October, the UV Index remains high, highlighting the importance of staying informed about the Ko Lanta UV Index to enjoy the beautiful beaches safely.
UV Risk Categories
September in Ko Lanta, Thailand, brings a gentle shift in the sun-drenched atmosphere, offering 288 hours of brilliant sunshine. While this marks a slight decline from the peak hours seen in March with 345 hours, it still holds its charm among the sunlit months. Following the bustling summer, where July and August basked in 321 and 318 hours respectively, September's warm rays invite a more tranquil experience, ideal for those looking to enjoy the island's natural beauty without the peak season's crowds. This gradual tapering of sunlight in September foreshadows the cooler months ahead, making it a perfect time for both relaxation and exploration on this stunning Thai island.
As summer gives way to autumn in Ko Lanta, September stands out with a notably low 8% chance of sunny weather. This sharp decline follows a pattern where the sunny days begin to dwindle significantly post-June. While January and February boast some of the highest probabilities for sunshine at 23% and 47% respectively, the months leading into September, including August (14%) and July (20%), hint at a shift towards wetter conditions. The transition into October doesn't bring much relief either, with a similar 8% chance of sun, suggesting that visitors seeking sun-soaked days may want to plan around this rainy season, as the island’s vibrant atmosphere is hidden behind clouds more often than not during this time.
In Ko Lanta, Thailand, the daylight duration exhibits a charming rhythm throughout the year. From January to February, the island enjoys a consistent 11 hours of daylight, perfect for leisurely beach strolls and sunset views. As spring arrives in March, daylight increases to 12 hours, continuing through the summer months until September. This steady span of 12 hours of sunlight creates an inviting atmosphere for outdoor adventures and relaxing moments by the sea. However, as October approaches, the daylight tapers back to 11 hours, signaling a gentle transition into the cooler months. Overall, September's daylight is a delightful continuation of summer, offering ample time to soak up the sun and explore the tropical paradise.
As September ushers in the changing seasons in Ko Lanta, Thailand, the winds soften slightly, with an average speed of 4.2 m/s (9 mph). This marks a gentle decline from the summer months, where winds reached up to 4.9 m/s in July and maintained a steady rhythm of around 4.7 m/s in August. The gradual decrease in wind speeds is part of a broader trend observed throughout the year, where the strong breezes of early months—peaking in January at 5.7 m/s—begin to mellow as the island transitions into the quieter, more serene atmosphere of autumn. As the weather cools and the winds shift, September provides a perfect backdrop for those seeking a tranquil escape amidst the natural beauty of this tropical paradise.
Weather in Ko Lanta varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Ko Lanta, focusing on differences in temperature, rainfall, humidity, and UV levels.
In September, the weather is notably warm with minimum temperatures around 25°C (78°F) and an average of 27°C (82°F), peaking at 29°C (85°F). However, it is also quite wet, receiving a substantial 306 mm (12.0 in) of rainfall over 24 days, resulting in high humidity levels at 84%. In contrast, January offers slightly cooler temperatures, with a minimum of 24°C (75°F) and an average of 27°C (81°F), but it tends to be drier, with only 98 mm (3.9 in) of rain over just 8 days and lower humidity at 76%. For more details, you can check Ko Lanta weather in January.
In September, the weather is characterized by warm temperatures, with a minimum of 25°C (78°F), an average of 27°C (82°F), and a maximum of 29°C (85°F). However, this month also brings significant rainfall, with 306 mm (12.0 in) of precipitation spread over 24 days, contributing to high humidity levels of 84%. In contrast, February enjoys a similar minimum of 25°C (77°F) and average of 27°C (82°F), but experiences warmer maximum temperatures that can reach up to 31°C (88°F). Additionally, February sees a drastic reduction in precipitation, with only 9 mm (0.3 in) across just 2 days and lower humidity at 73%. For more detailed information, you can check Ko Lanta weather in February.
In September, the weather is characterized by consistently warm temperatures, with minimums around 25°C (78°F) and average highs reaching 29°C (85°F). However, this month also experiences a significant amount of precipitation, totaling 306 mm (12.0 in) over approximately 24 days, coupled with high humidity levels of 84%. In contrast, March sees slightly warmer average temperatures, peaking at 32°C (89°F), but it boasts far less rainfall, averaging only 33 mm (1.3 in) across 8 days, and lower humidity at 74%. For a more detailed look at the weather in March, check out Ko Lanta weather in March.
When comparing the weather in September and April, it's evident that both months experience warm temperatures, but April tends to be slightly hotter. In September, the temperatures range from a minimum of 25°C (78°F) to a maximum of 29°C (85°F), while April sees a minimum of 25°C (78°F) and peaks at 31°C (88°F). Despite the warm temperatures, September is much wetter, receiving 306 mm (12.0 in) of precipitation over 24 days, compared to April's 180 mm (7.1 in) over 22 days, resulting in higher humidity levels of 84% in September versus 71% in April. For a closer look at what April weather is like on Ko Lanta, check out Ko Lanta weather in April.
September and May present distinct weather patterns, highlighting the transition between the wet and dry seasons. In September, the average temperature ranges from a minimum of 25°C (78°F) to a maximum of 29°C (85°F), with high humidity levels at 84% and considerable precipitation of 306 mm (12.0 in) over 24 rainy days. In contrast, May sees slightly warmer temperatures, with a minimum of 26°C (79°F) and a maximum of 30°C (87°F), but experiences less rainfall, totaling 255 mm (10.1 in) over 27 days, coupled with a lower humidity of 72%. For more specific details on weather conditions, you can refer to Ko Lanta weather in May.
September and June have similar warm temperatures, with both months featuring a minimum of around 25°C (78°F) and average highs reaching up to 30°C (87°F) in June compared to 29°C (85°F) in September. However, September experiences significantly more rainfall, totaling 306 mm (12.0 in) over 24 rainy days, while June has 234 mm (9.2 in) across 23 days. Additionally, humidity levels are slightly higher in September at 84% compared to 79% in June, contributing to a more tropical feel. For further details on June weather conditions, you can explore Ko Lanta weather in June.
When comparing the weather in September and July, we notice that both months experience warm temperatures, with September having a slightly lower average temperature of 27°C (82°F) compared to July's 28°C (83°F). However, July is a bit warmer at its maximum, reaching up to 30°C (86°F), while September peaks at 29°C (85°F). A significant difference lies in precipitation; September sees much higher rainfall, with an average of 306 mm (12.0 in) over 24 days, compared to July's 203 mm (8.0 in) over 18 days. Additionally, September's humidity is higher at 84%, compared to July's 79%, making it feel more humid. For more detailed information on July weather, you can check Ko Lanta weather in July.
In comparing the weather of September and August, we see some notable differences. September experiences slightly cooler temperatures, with an average of 27°C (82°F) compared to August's 28°C (82°F), although both months have similar minimum temperatures of 25°C (78°F). However, September is characterized by significantly higher rainfall, receiving 306 mm (12.0 in) over 24 days, while August has a total of 241 mm (9.5 in) spread across 21 days. Additionally, humidity levels are slightly higher in September at 84% compared to 82% in August. For more details on the weather patterns in August, you can check Ko Lanta weather in August.
In September, the weather features a minimum temperature of 25°C (78°F) and an average of 27°C (82°F), with maximum temperatures reaching 29°C (85°F). The month experiences a significant amount of rainfall, totaling 306 mm (12.0 in) over 24 days, along with high humidity at 84%. In contrast, October sees similar temperature patterns with a minimum of 25°C (77°F) and an average of 27°C (81°F), but it allows for a slightly warmer maximum of 30°C (86°F). Rainfall increases marginally to 314 mm (12.4 in) across 26 days, with humidity slightly lower at 83%. To learn more about the weather in Ko Lanta during this month, check out Ko Lanta weather in October.
In September, the weather experiences a warm range with minimum temperatures around 25°C (78°F) and averages peaking at 29°C (85°F). There is significant rainfall, with 306 mm (12.0 in) of precipitation spread over 24 days, maintaining a high humidity level of 84%. In contrast, November sees a similar temperature profile, with minimums also at 25°C (77°F) and averages around 30°C (87°F). However, it experiences slightly less rainfall, totaling 257 mm (10.1 in) over 26 days, while humidity remains consistent at 84%. Overall, both months share warm temperatures, but November offers a marginally drier experience. For more detailed insights, visit Ko Lanta weather in November.
In September, the weather is characterized by slightly higher temperatures with a minimum of 25°C (78°F) and a maximum of 29°C (85°F), along with significant rainfall of 306 mm (12.0 in) spread over 24 days, resulting in high humidity levels of 84%. In contrast, December offers a similar average temperature of 27°C (81°F) but features a marginally warmer maximum of 30°C (86°F). However, the precipitation drops to 134 mm (5.3 in) over just 14 days, maintaining the humidity at 84%. For more detailed insights on how December weather compares specifically, check out Ko Lanta weather in December.
As September unfolds in Ko Lanta, the island reveals its captivating tropical charm under a veil of increased humidity and substantial rainfall. With temperatures hovering around a pleasant average of 27°C, this month stands out due to its higher precipitation, averaging 306 mm across approximately 24 rainy days. Unlike the typically dry and sun-drenched months preceding it, September invites a lush, vibrant landscape where the island's natural beauty thrives. If you're captivated by the allure of monsoon season and the serenity it brings, explore more about the unique weather patterns in Ko Lanta through this link: Ko Lanta Climate.