Last updated: August 27, 2025
In September, Ko Pha Ngan, Thailand, experiences a warm tropical climate characterized by an average temperature of 28°C (82°F), with daily highs reaching up to 30°C (86°F) and lows around 25°C (78°F). This month marks a wet period with approximately 186 mm (7.3 in) of rainfall spread across 22 days, contributing to a high humidity level of 87%. These conditions create a lush, vibrant atmosphere, ideal for enjoying the island's natural beauty while also maximizing readiness for occasional downpours.
In September, Ko Pha Ngan experiences mild and comfortable temperatures, with minimums around 25°C (78°F) and averages at 28°C (82°F). As the month progresses, the island welcomes a slight decrease in maximum temperatures, reaching 30°C (86°F). This marks a subtle transition from the hotter summer months, as September offers warm days perfect for beach lounging, yet more manageable than the peak heat of April and May. The consistency in temperatures throughout the year shows that while the island remains tropical and inviting, September’s slightly cooler climate makes it an ideal time for travelers seeking a blend of warmth and respite.
In September, Ko Pha Ngan experiences a notable spike in precipitation, receiving 186 mm (7.3 in) of rainfall over 22 days. This trend marks one of the wettest months of the year, as the island transitions into the height of its rainy season. The consistent rain during this month not only contributes significantly to the annual total but also sets the stage for the even heavier downpours of October and November. While September brings increased moisture, it also enriches the lush landscapes and vibrant ecosystems that define this tropical paradise, offering a unique backdrop for visitors who embrace the island's beauty amidst the rain.
As September rolls into Ko Pha Ngan, the humidity remains high at 87%, closely trailing the peak levels observed in the preceding months of August (88%) and July (86%). This slight decrease suggests a seasonal shift, though the air still feels notably moist. Over the year, humidity starts relatively moderate in the early months—72% in January—but begins to climb significantly from May onwards, peaking during the summer months. Notably, the humidity levels stabilize in the late fall months, settling around 86% to 87% in October and November. This pattern highlights the island's warm and humid climate, a characteristic that travelers should keep in mind while planning their visits.
In September, Ko Pha Ngan, Thailand, continues to bask in intense sunlight, with the UV Index holding steady at 14, categorized as extreme. This means that even brief exposure can lead to sunburn in just 10 minutes. Following a trend established earlier in the year, the UV levels remain remarkably high, paralleling the readings from August and preceding months like July and June. With such persistent intensity, it's crucial for visitors and locals alike to stay informed and take protective measures against harmful UV rays. For more details on navigating the UV Index in this tropical paradise, visit Ko Pha Ngan UV Index.
UV Risk Categories
In September, Ko Pha Ngan experiences a gentle transition as the summer months wane, with an impressive 286 hours of sunshine. While this is slightly lower than the peak of summer, it still ensures plenty of bright days for relaxation and exploration. This month marks the tail end of the high sunshine period, just after the sunniest months of March and May, where hours reached up to 346 and 331 respectively. Despite the slight dip, September remains a superb choice for visitors seeking to enjoy warm beach days and vibrant sunsets, as it offers a perfect blend of lingering warmth without the overwhelming heat of the peak season, making it an ideal time for a tranquil getaway.
September in Ko Pha Ngan, Thailand, greets visitors with a notably low probability of sunny weather, at just 11%. This aligns with a trend observed through the months leading up to the year's end, where the likelihood of sunshine remains minimal, especially compared to the earlier peak in February at 59%. As the rainy season sets in, particularly from May to August with odds dropping to as low as 9%, September retains this dim outlook, making it one of the cloudiest times of the year. Travelers seeking vibrant beach days may want to plan their visits for the more sun-kissed months like January or December, as September's overcast skies are likely to dampen outdoor plans.
In September, the enchanting island of Ko Pha Ngan enjoys a balanced 12 hours of daylight, mirroring the summer months from April to August. This consistency in daylight hours supports the island's vibrant outdoor lifestyle, offering ample time for sunbathing, snorkeling, and exploring lush landscapes. Following September, daylight begins to wane slightly into the autumn months, dropping down to 11 hours in October and remaining steady through to December. This gradual transition signals a shift in the rhythm of island life, as visitors can still relish the beauty of Ko Pha Ngan while experiencing its tranquil, quieter side as the year winds down.
As September rolls in on the picturesque Ko Pha Ngan, Thailand, the island experiences a gentle breeze with an average wind speed of 4.9 m/s (11 mph). This slight shift maintains the smooth flow of the preceding months, as the winds had peaked at 6.0 m/s (13 mph) in July before gradually easing off. In comparison, September's winds mirror February’s calm, providing a delightful balance after the gusts of summer. Transitioning into October, the winds pick up slightly again, demonstrating the island's dynamic climatic rhythm. The continuous interplay of these gentle breezes enhances the tranquil atmosphere, making it a perfect time for relaxation and exploration on this tropical haven.
Weather in Ko Pha Ngan varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Ko Pha Ngan, focusing on differences in temperature, rainfall, humidity, and UV levels.
In September, the weather is generally warmer and more humid, with average temperatures ranging from 25°C (78°F) to a maximum of 30°C (86°F) and an average humidity of 87%. This month also sees significant rainfall, with 186 mm (7.3 in) of precipitation spread over 22 days. In contrast, January experiences slightly cooler temperatures, with averages from 24°C (76°F) to a maximum of 28°C (83°F) and lower humidity at 72%. Additionally, January is much drier, with only 144 mm (5.7 in) of rainfall over just 11 days. For more details, check out the Ko Pha Ngan weather in January.
September and February present distinctly different weather patterns. In September, temperatures range from a minimum of 25°C (78°F) to a maximum of 30°C (86°F), with an average of 28°C (82°F). This month experiences significant rainfall, with 186 mm (7.3 in) of precipitation spread across 22 days, contributing to a high humidity level of 87%. In contrast, February offers milder temperatures, with a minimum of 24°C (76°F), an average of 27°C (81°F), and a maximum of 29°C (84°F). The rainfall is notably lower, totaling only 39 mm (1.5 in) over just 7 days, and the humidity drops to a more comfortable 68%. For more detailed insights, you can check Ko Pha Ngan weather in February.
September and March exhibit similar temperature ranges, with both months sharing a minimum of 25°C (78°F), an average of 28°C (82°F), and a maximum of 30°C (86°F). However, the two months diverge significantly in terms of precipitation and humidity. September sees a substantial amount of rainfall, totaling 186 mm (7.3 in) over 22 days, and features high humidity at 87%. In contrast, March offers a much drier experience, with only 36 mm (1.4 in) of rain over just 6 days and a more comfortable humidity level of 68%. For a detailed look at March weather, you can visit Ko Pha Ngan weather in March.
September and April share similar average temperatures, both hovering around 28°C (82°F), but September experiences slightly more humidity and rainfall. In September, minimum temperatures are consistently around 25°C (78°F) with maximum highs reaching 30°C (86°F), while April can peak at 31°C (88°F). Notably, September sees significantly more precipitation, with 186 mm (7.3 in) over 22 days compared to April's 142 mm (5.6 in) over just 16 days. This makes September feel more humid, at 87%, while April's humidity is a more comfortable 69%. For more details on April weather specifics, you can visit Ko Pha Ngan weather in April.
When comparing the weather in September and May, both months exhibit warm temperatures but with some differences in precipitation and humidity. In September, the temperatures range from a minimum of 25°C (78°F) to a maximum of 30°C (86°F), while May is slightly warmer with a low of 26°C (79°F) and a high of 31°C (89°F). September sees more rainfall, with 186 mm (7.3 in) over 22 days, compared to May's 152 mm (6.0 in) across 23 days. Furthermore, September has a higher humidity level at 87%, making it feel more humid than May, which has a humidity level of 77%. For more information on weather specifics, you can check Ko Pha Ngan weather in May.
In comparing the weather between September and June, we see a slight difference in temperature and precipitation patterns. September typically has a minimum temperature of 25°C (78°F) and a maximum of 30°C (86°F), while June is a bit warmer with a minimum of 26°C (79°F) and a maximum of 31°C (89°F). Both months have similar average temperatures, around 28°C (82°F in September and 84°F in June).
However, September is significantly wetter, receiving 186 mm (7.3 in) of rain over 22 days, compared to June's 133 mm (5.2 in) across 20 days. Humidity levels are comparable, with September at 87% and June at 86%. For more detailed insights, you can check the full report here: Ko Pha Ngan weather in June.
In comparing the weather of September and July, both months showcase warm temperatures, but with some notable differences. In September, the minimum temperature is slightly lower at 25°C (78°F) compared to July's 26°C (79°F), while the average temperature remains similar at 28°C (82°F). However, September experiences slightly higher maximum temperatures, reaching up to 30°C (86°F), compared to July's peak of 31°C (88°F). Precipitation is significantly greater in September, with 186 mm (7.3 in) falling over 22 days, whereas July sees only 109 mm (4.3 in) over 19 days. Humidity levels are also comparable, with September at 87% and July at 86%. For a more detailed look at July's weather specifics, you can check out Ko Pha Ngan weather in July.
In comparison to August, September experiences slightly cooler temperatures, with a minimum of 25°C (78°F) and a maximum of 30°C (86°F), while August records a minimum of 26°C (79°F) and peaks at 31°C (88°F). Both months show similar average temperatures, around 28°C (82°F) to 28°C (83°F). However, September is notably wetter, with 186 mm (7.3 in) of precipitation over 22 days, whereas August receives 121 mm (4.7 in) over 20 days. Humidity remains high in both months, slightly decreasing from 88% in August to 87% in September. For more detailed insights, you can check Ko Pha Ngan weather in August.
In September, the weather is characterized by warm temperatures, with a minimum of 25°C (78°F) and an average of 28°C (82°F), peaking at 30°C (86°F). However, this month also sees significant rainfall, totaling 186 mm (7.3 in) over 22 days, accompanied by high humidity at 87%. In contrast, October maintains similar temperatures with a minimum of 25°C (78°F) and an average of 27°C (81°F), but experiences even heavier rainfall, reaching 267 mm (10.5 in) across 27 days, while humidity slightly decreases to 86%. For a detailed look at the weather specifically during October, you can visit Ko Pha Ngan weather in October.
When comparing the weather in September and November, both months exhibit similar temperature ranges, with September having a minimum of 25°C (78°F) and an average of 28°C (82°F), while November shows a slightly lower average of 27°C (81°F). Precipitation, however, significantly increases in November, rising to 313 mm (12.3 in) over 24 days, compared to September's 186 mm (7.3 in) over 22 days. The humidity remains constant at 87% for both months, contributing to the tropical feel of the region. For more detailed insights, you can check Ko Pha Ngan weather in November.
In comparing the weather between September and December, we can see some notable differences. September typically experiences slightly higher temperatures, with an average of 28°C (82°F) compared to December's average of 27°C (81°F). Both months have high humidity levels, though September sees a marginally higher humidity at 87%, while December's humidity is at 83%. Precipitation is also significant in both months, with September averaging 186 mm over 22 days and December seeing 194 mm over 16 days. This indicates that while both months are rainy, December's rain tends to be concentrated over fewer days. For more detailed information, you can check Ko Pha Ngan weather in December.
As September rolls in, Ko Pha Ngan's weather transforms into a humid, tropical embrace, characterized by higher precipitation and consistent warmth. With the skies often overcast, this month sees many rainy days, making it notably wetter than the drier months preceding it. Despite the rain, temperatures remain comfortable, lingering in the high 20s°C, offering a warmth that's inviting yet tempered by frequent showers. This blend of warmth and moisture sets September apart, creating a lush and vibrant landscape, perfect for those who enjoy the island's quieter, serene side. For a deeper look at what to expect throughout the year, check out Ko Pha Ngan Climate.