Last updated: August 27, 2025
Experience the tropical allure of Ko Samui, Thailand in August, where temperatures are a warm average of 28°C (83°F), peaking at a maximum of 31°C (89°F) and dipping to a comfortable 26°C (79°F). While the island welcomes a lush ambiance with 80 mm (3.1 in) of rainfall over 18 days, the high humidity level of 88% adds to the sultry atmosphere. August is a month rich with vibrant greenery, making it perfect for those seeking adventure amidst the island's stunning landscape and serene beaches. Whether you’re planning relaxation or exploration, Ko Samui offers an exotic escape that captivates the senses.
In August, Ko Samui basks in warm tropical temperatures with a minimum of 26°C (79°F), an average of 28°C (83°F), and a maximum reaching up to 31°C (89°F). This month mirrors the hot summer trend, maintaining consistent warmth from the previous months of July and May, where similar highs were recorded. The temperatures in August ensure a balmy atmosphere perfect for beachgoers and outdoor activities. Despite being in the wet season, the island’s climate remains inviting, making it an appealing destination for sun-seekers looking to enjoy the vibrant surroundings while feeling the gentle sea breezes. Overall, August exemplifies the alluring charm of Ko Samui’s tropical allure.
In August, Ko Samui experiences a mild uptick in rainfall, with precipitation measuring around 80 mm (3.1 in) over 18 days. This marks a slight increase from the dryer months of July, which recorded 79 mm (3.1 in) over 17 days. As the monsoon season progresses, the island transitions towards the wetter months ahead, particularly September and October, which see a substantial rise in both precipitation volume and frequency. Travelers during August can expect sporadic showers amidst warm tropical conditions, making it a vibrant time for lush landscapes but also a reminder of the island's dynamic weather patterns.
In August, Ko Samui experiences its peak humidity level of 88%, making it one of the most humid months of the year. This trend of increasing humidity begins in May with a rise to 77% and continues into the summer months, reaching a consistent high in June and July at 86%. Following August, humidity remains high in September and October, though it shows a slight decrease to 87% and 86%, respectively. Overall, the data reveals that the latter half of the year is characterized by notably high humidity, contributing to Ko Samui's lush, tropical allure.
In August, Ko Samui, Thailand continues to experience a notably high UV Index of 14, categorized as extreme, which means that just 10 minutes of exposure could lead to skin damage. This trend of elevated UV levels persists throughout the summer months, with UV Index values consistently reaching between 13 and 15 from March to August. With the sun blazing brightly, it's crucial for visitors and residents alike to take necessary precautions when outdoors. As the season transitions into fall, the UV index remains resiliently high, reflecting a pattern that emphasizes the importance of sun safety on this beautiful island. For more information on UV levels throughout the year, visit Ko Samui UV Index.
UV Risk Categories
In August, visitors to Ko Samui, Thailand can delight in an impressive 300 hours of sunshine, which is consistent with the island's trend of abundant daylight during the summer months. Following the peak of 346 hours in March, sunshine levels remain relatively high throughout the early part of the year, with only a slight decline as the rainy season approaches. From June to August, the sunshine hours hover around the 300-hour mark, offering a perfect balance of radiant days and occasional refreshing rain, ideal for beach lovers and adventurers alike. This gradual taper into the cooler months makes August a fantastic time to enjoy both the vibrant atmosphere and breathtaking landscapes that Ko Samui has to offer.
When planning a trip to Ko Samui, Thailand, it's essential to consider the likelihood of sunny weather in August. Unfortunately, this month sees a dramatic dip in sunshine, with only a 9% chance of clear skies. This trend of diminishing sun continues from the warmer months of April and May, which experience a better chance of sunshine at 32% and 21%, respectively. As the monsoon season approaches, July also offers limited sunshine at just 18%. Following August, September and October offer slight improvements but remain low at 11%. So, if your vacation plans hinge on basking under warm rays, you may want to consider other months for your visit.
In Ko Samui, Thailand, August brings an inviting 12 hours of daylight, consistent with the trend seen in the preceding months from April through September. This enduring stretch of daylight offers plenty of opportunities for beachgoers and adventurers to explore the island’s stunning landscapes and vibrant culture. As the year progresses, daylight begins to taper off towards October, when it returns to 11 hours, highlighting a subtle yet noteworthy shift as the region transitions into its less sun-drenched months. Whether basking in the tropical sun or enjoying the island's lively atmosphere, visitors in August can take full advantage of the ample daylight hours.
August in Ko Samui, Thailand, experiences a gentle average wind speed of 4.7 m/s (11 mph), contributing to the island's warm and inviting atmosphere. This month typically shows a slight dip from the breezier months of July and December, which boast average speeds of 5.4 m/s (12 mph). Interestingly, while August may not be the windiest, it retains a consistent airflow that is perfect for a range of outdoor activities, from relaxing on the beach to engaging in water sports. As the region transitions from the peak summer months, the winds continue to play a significant role, creating a soothing backdrop to the lush landscapes and vibrant culture of Ko Samui.
Weather in Ko Samui varies notably across the year, with each month offering distinct climate conditions. This page compares August’s weather to other months in Ko Samui, focusing on differences in temperature, rainfall, humidity, and UV levels.
In August, the weather is characterized by warmer temperatures, with a minimum of 26°C (79°F) and a maximum of 31°C (89°F). The month sees an average temperature of 28°C (83°F) along with considerable humidity at 88%, and it experiences approximately 80 mm (3.1 in) of precipitation over 18 days. In contrast, January offers slightly cooler temperatures, ranging from a minimum of 24°C (76°F) to a maximum of 28°C (83°F), with an average of 27°C (80°F). The humidity is lower at 72%, yet January receives more rainfall, totaling around 144 mm (5.7 in) on 13 days. For a detailed look at January's weather, you can visit Ko Samui weather in January.
August and February offer distinctly different weather experiences. In August, temperatures range from a minimum of 26°C (79°F) to a maximum of 31°C (89°F), with an average of 28°C (83°F). The month sees 80 mm of precipitation spread over 18 days, resulting in high humidity levels around 88%. In contrast, February has slightly lower temperatures, with a minimum of 25°C (77°F) and a maximum of 28°C (83°F), averaging 27°C (81°F). Precipitation is significantly reduced to 39 mm over just 8 days, and humidity decreases to 68%. For a detailed overview of February weather, feel free to check this link: Ko Samui weather in February.
When comparing the weather in August and March, we notice some distinct differences. August typically features a warmer climate, with minimum temperatures around 26°C (79°F) and maximum temperatures reaching 31°C (89°F), while March has slightly cooler temperatures, with a minimum of 25°C (78°F) and a maximum of 30°C (86°F). Precipitation is also more pronounced in August, with 80 mm (3.1 in) spread over 18 days, compared to March's 38 mm (1.5 in) over just 7 days. Moreover, August experiences higher humidity levels at 88%, while March has a more comfortable 68%. For more detailed insights, you can visit Ko Samui weather in March.
When comparing the weather in April and August, we find that both months feature warm temperatures, with averages around 28°C (83°F) and maximums peaking at 31°C (88°F in April and 89°F in August). However, August typically experiences a higher minimum temperature of 26°C compared to April's 25°C. Precipitation is another notable difference, as April sees much more rain with 144 mm (5.7 in) over 15 days, while August averages 80 mm (3.1 in) but spreads across 18 days. Additionally, humidity levels are significantly higher in August at 88%, compared to April's 69%. For more detailed information, you can visit Ko Samui weather in April.
In comparing the weather between August and May, both months exhibit similar temperature ranges, with minimums around 26°C (79°F) and average temperatures hovering at 28°C. However, August has slightly cooler maximum temperatures at 31°C (89°F) compared to May's peak of 32°C (89°F). Precipitation patterns reveal that August is less rainy, with 80 mm (3.1 in) falling over 18 days, while May experiences more rainfall, totaling 126 mm (5.0 in) across 22 days. Additionally, humidity is notably higher in August at 88%, compared to May's 77%. For more details, you can check Ko Samui weather in May.
August and June share similar temperature ranges, with both months having a minimum of 26°C (79°F) and an average temperature around 28°C (83°F in August and 84°F in June). However, June records a slightly higher maximum temperature of 32°C (89°F) compared to August's 31°C (89°F). In terms of precipitation, June is wetter, with 96 mm (3.8 in) over 18 days, while August has 80 mm (3.1 in), also over 18 days. Humidity is slightly higher in August at 88%, compared to June's 86%. For more detailed information, check out Ko Samui weather in June.
In comparing the weather between July and August, both months feature similar temperature ranges, with minimums of 26°C (79°F), average temperatures of 28°C (83°F), and maximums around 31°C (89°F) in August, slightly cooler at 31°C (88°F) in July. Precipitation levels are nearly identical, with August seeing 80 mm (3.1 in) over 18 days, just slightly more than July's 79 mm (3.1 in) across 17 days. Humidity is notably higher in August at 88%, compared to July's 86%. For a more detailed look at July weather, check out Ko Samui weather in July.
In August, the weather tends to be quite warm, with temperatures ranging from a minimum of 26°C (79°F) to a maximum of 31°C (89°F) and an average of 28°C (83°F). The month experiences significant rainfall, with 80 mm (3.1 in) spread over 18 days and a high humidity of 88%. Conversely, September sees slightly cooler temperatures, with highs reaching only 30°C (86°F) and similar minimum temperatures of 26°C (78°F). However, precipitation markedly increases, totaling 151 mm (5.9 in) across 21 days, with humidity slightly decreasing to 87%. Overall, while both months are warm and humid, September is wetter and a tad cooler, making the weather feel more refreshing. For more detailed information, check out Ko Samui weather in September.
August and October weather in Ko Samui display some similarities and notable differences. In August, the temperatures range from a minimum of 26°C (79°F) to a maximum of 31°C (89°F), with an average of 28°C (83°F). The month experiences approximately 80 mm of precipitation over 18 days, accompanied by high humidity levels of 88%. In contrast, October sees slightly cooler temperatures, with a minimum of 25°C (77°F), an average of 27°C (81°F), and a maximum of 30°C (85°F). However, October is significantly wetter, with rainfall reaching 241 mm over 28 days, and humidity slightly lowers to 86%. For more details, visit Ko Samui weather in October.
In August, the weather is relatively warm with average temperatures ranging from a minimum of 26°C (79°F) to a maximum of 31°C (89°F). It experiences moderate precipitation, receiving about 80 mm (3.1 in) over 18 days, along with high humidity levels of 88%. In contrast, November sees slightly cooler temperatures, with averages between 25°C (77°F) and 29°C (85°F), but significantly higher rainfall, totaling around 336 mm (13.2 in) across 24 days. The humidity remains comparable at 87%. For more detailed information on this month’s weather, visit Ko Samui weather in November.
When comparing the weather in August and December, August tends to be slightly warmer, with average temperatures ranging from 26°C (79°F) to a maximum of 31°C (89°F). In contrast, December's temperatures are a bit cooler, with a range from 24°C (76°F) to a maximum of 29°C (84°F). August experiences 80 mm (3.1 in) of precipitation over 18 days, while December sees a significantly higher rainfall of 207 mm (8.1 in) over 17 days, leading to a wetter and more humid atmosphere despite the lower humidity at 83%. For more detailed insights, you can visit Ko Samui weather in December.
In August, Ko Samui experiences a unique blend of warm temperatures and high humidity, offering an inviting tropical atmosphere that differs slightly from other months. With maximum temperatures typically soaring around 31°C, this month tends to be among the warmer periods on the island. However, the increased rainfall, with about 18 rainy days, contributes to lush landscapes, making the island particularly vibrant. Despite the rain, the average temperature remains pleasant, making it a great time for travelers seeking a balance between sunny beach days and refreshing tropical showers. For a more detailed look at what to expect throughout the year, check out Ko Samui Climate.