Last updated: August 27, 2025
May in Koh Tao, Thailand brings a tropical warmth that is hard to resist, with maximum temperatures reaching 31°C (89°F) and an average of 29°C (84°F). While the island basks in warmth, it also experiences a high humidity level of 77%, making the atmosphere feel even more vibrant. Visitors should be prepared for occasional showers, as the month sees 153 mm (6.0 in) of rain over approximately 22 days. Despite the wet forecast, the lush landscapes and sparkling waters of Koh Tao offer a stunning backdrop, making May a unique time to explore this beautiful destination.
In Koh Tao, Thailand, May brings a delightful transition as temperatures steadily rise, with minimums averaging 26°C (79°F) and highs reaching up to 31°C (89°F). This month marks a shift towards warmer days, as the average temperature climbs to a comfortable 29°C (84°F), setting the stage for sun-soaked adventures and vibrant beach outings. As the island embraces the early signs of the monsoon season, the blend of warmth and occasional rainfall creates a lush, tropical atmosphere, making May an ideal time to explore its stunning underwater landscapes and enjoy the bustling local culture. Overall, May's inviting temperatures provide the perfect backdrop for both relaxation and exploration on this idyllic island getaway.
May marks a significant shift in Koh Tao's weather, with precipitation reaching 153 mm (6.0 in), making it one of the wettest months of the year. During this time, the island experiences about 22 rainy days, a notable increase compared to the drier months preceding it. This uptick in rainfall sets the stage for the lush transformation of the landscape, with vibrant greenery flourishing across the island. As the resort season begins to transition, visitors can expect the tropical charm of Koh Tao to shine through the moisture-laden air, despite the frequent showers. This pattern reflects a broader trend, as May heralds the onset of the wet season, paving the way for heavier rains in the subsequent months.
May marks a significant shift in humidity levels on Koh Tao, Thailand, with a notable increase to 77%. This rise signals the transition into the wet season, as the island's tropical climate becomes increasingly humid. Prior to May, the humidity consistently ranged from 68% to 72%, but with the arrival of this month, visitors can expect a notable spike, setting the stage for the even higher humidity that follows in June and July, reaching peaks of 86%. The gradual elevation in humidity from April's 69% to May's 77% not only highlights the island's transition into wetter weather but also prepares travelers for the lush, vibrant landscapes that come alive during this time. Embrace the warm, tropical atmosphere, but be ready for the embrace of the island's moist climate!
In May, Koh Tao experiences a persistent UV Index of 14, classified under the extreme exposure category, which means that even short exposure—just 10 minutes—can lead to sunburn. Following a trend established in the previous months, May continues to showcase high UV levels, peaking in March and April, where the index reached 15. As the island transitions into the hotter months, maintaining sun safety is crucial for both locals and visitors. Travelers are encouraged to stay informed about the upcoming UV Index fluctuations throughout the year, especially given that conditions remain consistently intense. For more detailed information, check out the complete Koh Tao UV Index guide.
UV Risk Categories
In Koh Tao, Thailand, May shines brightly with a pleasing 328 hours of sunshine, making it an enticing destination for sun-seekers and adventurers alike. This month follows a trajectory of increasing daylight from the cooler start of the year, peaking in March at 345 hours before tapering slightly in April. As the rainy season approaches, sunshine hours in May remain robust, ensuring that visitors can enjoy the island's stunning beaches and vibrant marine life. Notably, the months leading up to May display a generally sunny trend, with February and March providing ample brightness, while the summer months of June and July maintain a comparable level of sunshine, enriching the allure of this tropical paradise.
While Koh Tao, Thailand, enjoys a variety of weather patterns throughout the year, May presents a notable shift in sunshine opportunities. With only a 22% chance of sunny weather, it emerges as one of the less favorable months for sun-seekers, following a more promising April, which boasts a 29% chance. This dip in sunny days is part of a broader trend; as the months progress from February's peak of 60% down to the rainy season in August, the likelihood of enjoying bright sunny skies decreases substantially. Travelers looking for vibrant sunshine might want to plan their trips for earlier in the year when the chances are significantly higher.
In Koh Tao, Thailand, the rhythm of daylight unfolds beautifully throughout the year, offering an inspiring blend of sun and shadow. January and February greet visitors with a consistent 11 hours of daylight, creating a serene atmosphere ideal for relaxation. As the months progress into March and April, daylight nudges up to 12 hours, inviting those eager for adventures under the sun. The May skies maintain this generous 12-hour stretch, continuing through the summer months of June, July, and August, where the daylight remains stable—a perfect backdrop for diving and exploring. As the year begins to shift, September holds onto that plentiful light before gradually reducing to 11 hours by October, signaling the transition into the cooler months of November and December. Throughout this journey, Koh Tao's daylight offers a consistent and inviting allure, ensuring each day glimmers with possibility.
In Koh Tao during May, the average wind speed reaches 4.2 m/s (9 mph), slightly rebounding from the calmer April days. This gentle breeze sets a perfect backdrop for outdoor activities, allowing visitors to savor the island's stunning landscape without overwhelming gusts. As we transition into the following months, the winds start to pick up, with June and July seeing averages of 5.3 to 5.9 m/s (12 to 13 mph). Such a gradual increase hints at the onset of the monsoon season, leading to more invigorating conditions. Overall, May serves as a brief interlude, offering a sweet spot of tranquil winds before the more robust breezes take over in the summer months.
Weather in Koh Tao varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in Koh Tao, focusing on differences in temperature, rainfall, humidity, and UV levels.
May and January in Koh Tao present distinct weather patterns reflective of the tropical climate. In May, temperatures range from a minimum of 26°C (79°F) to a maximum of 31°C (89°F), with an average of 29°C (84°F). This month experiences higher humidity at 77% and significantly more rainfall, totaling 153 mm (6.0 in) over 22 days. In contrast, January boasts slightly cooler temperatures, with a minimum of 24°C (76°F) and a maximum of 28°C (84°F), averaging 27°C (81°F). The precipitation is also less in January, amounting to 148 mm (5.8 in) across just 10 days, with lower humidity at 72%. For more details on January weather, check out Koh Tao weather in January.
May typically features warmer temperatures compared to February, with average highs reaching up to 31°C (89°F) versus February's max of 29°C (85°F). Additionally, May is significantly wetter, experiencing about 153 mm (6.0 in) of rainfall over 22 days, while February only sees 37 mm (1.5 in) of precipitation over just 7 days. Humidity levels are also higher in May at 77%, compared to February's more comfortable 68%. For more detailed insights into February's climate, you can check out Koh Tao weather in February.
In comparing the weather of March and May, March tends to be slightly cooler with average temperatures ranging from 25°C (78°F) to 30°C (86°F), while May sees higher temperatures with a minimum of 26°C (79°F) and an average of 29°C (84°F). Additionally, May is significantly wetter, experiencing 153 mm (6.0 in) of precipitation over 22 days, compared to just 33 mm (1.3 in) over 6 days in March. Moreover, the humidity in May reaches 77%, while March has a more comfortable humidity of 68%. For more detailed insights, you can check Koh Tao weather in March.
In comparing the weather conditions of May and April, May tends to be slightly warmer, with average temperatures reaching around 29°C (84°F) compared to April's average of 28°C (83°F). Both months show similar maximum temperatures of 31°C (89°F) and 31°C (88°F), respectively. However, May experiences more rainfall, totaling 153 mm (6.0 in) over 22 rainy days, compared to April's 133 mm (5.3 in) across 16 rainy days. Additionally, the humidity in May is higher at 77%, compared to April's 69%. For more detailed insights into April's weather, you can check Koh Tao weather in April.
In May, the weather showcases slightly higher temperatures, with an average of 29°C (84°F) and maximums reaching 31°C (89°F). It experiences considerable rainfall, totaling 153 mm (6.0 in) across 22 days, and maintains a humidity level of 77%. In contrast, June brings slightly cooler conditions with an average temperature of 28°C (83°F) and similar highs of 31°C (89°F). Precipitation decreases to 137 mm (5.4 in) over 19 days, but humidity rises to 86%. For a detailed look at the weather conditions during June, check out Koh Tao weather in June.
In comparing the weather between May and July, both months showcase warm temperatures, but May tends to be slightly warmer overall. May has an average temperature of 29°C (84°F), while July has a slightly lower average of 28°C (83°F). Both months experience minimum temperatures around 26°C (79°F) and maximums reaching 31°C (89°F). However, May sees significantly more rainfall, with 153 mm (6.0 in) of precipitation over 22 days, compared to July's 113 mm (4.4 in) over 19 days. Furthermore, July has a higher humidity level at 86%, compared to May's 77%. For more detailed insights, check out Koh Tao weather in July.
When comparing the weather in May and August, both months show similar temperature ranges, with May averaging slightly warmer at 29°C (84°F) compared to August's average of 28°C (83°F). Both months experience a minimum temperature of 26°C (79°F) and reach a maximum of 31°C (88-89°F). However, May is wetter, with 153 mm (6.0 in) of precipitation over 22 days, while August has a slightly lower precipitation of 133 mm (5.2 in) over 21 days. Humidity levels are noticeably higher in August at 88%, compared to May's 77%. For more detailed information, you can check Koh Tao weather in August.
In comparing the weather of May and September, both months exhibit warm temperatures, with May slightly warmer on average, ranging from 26°C (79°F) to a maximum of 31°C (89°F). September, although slightly cooler with temperatures from 26°C (78°F) to a max of 30°C (86°F), experiences higher humidity levels at 87% compared to May's 77%. Additionally, September receives more precipitation, totaling 192 mm (7.6 in) over 22 days, while May has 153 mm (6.0 in) across the same number of days. For a closer look at conditions specific to September, you can check out Koh Tao weather in September.
May and October present distinct weather patterns, reflecting the transition between seasons. In May, temperatures typically range from a minimum of 26°C (79°F) to a maximum of 31°C (89°F), with an average of 29°C (84°F). The month experiences about 153 mm (6.0 in) of precipitation over 22 days, accompanied by a humidity level of 77%. In contrast, October sees slightly cooler temperatures, with a minimum of 25°C (77°F) and an average of 27°C (82°F), peaking at 30°C (86°F). However, it is notably wetter, with 242 mm (9.5 in) of rain falling across 27 days and a higher humidity level of 86%. For more details on the weather during this month, you can check Koh Tao weather in October.
In May, the weather is warm and humid, with temperatures ranging from a minimum of 26°C (79°F) to a maximum of 31°C (89°F) and an average of 29°C (84°F). However, this month sees a significant amount of rainfall, totaling 153 mm (6.0 in) over 22 days. In contrast, November experiences slightly cooler temperatures, with a minimum of 25°C (77°F), an average of 27°C (82°F), and a maximum of 29°C (85°F). Notably, November is much wetter, with precipitation reaching 281 mm (11.0 in) also over 22 days, paired with increased humidity at 87%. For more detailed information, you can check Koh Tao weather in November.
May and December both exhibit warm tropical climates, but several notable differences distinguish them. In May, temperatures range from a minimum of 26°C (79°F) to a maximum of 31°C (89°F), with an average of 29°C (84°F). This month also sees significant precipitation, with about 153 mm (6.0 in) spread over 22 days, contributing to a humidity level of 77%.
In contrast, December features slightly cooler temperatures, with a minimum of 24°C (75°F) and a maximum of 29°C (85°F), averaging around 27°C (81°F). While precipitation increases to 191 mm (7.5 in), it falls over fewer days—14 days—resulting in higher humidity at 83%. Overall, December is wetter and more humid, yet offers a milder temperature range compared to the hotter and more extensively rainy May. For more information, you can check Koh Tao weather in December.
As May arrives in Koh Tao, the island's weather begins to shift, embracing a more humid atmosphere that sets it apart from previous months. With temperatures steadily climbing and frequent rainfall—often characterized by short, refreshing showers—visitors can expect a lush and vibrant landscape. The combination of increased humidity and precipitation not only adds a tropical flair but also makes May a unique time for exploring the island's natural beauty. For those keen to understand more about how Koh Tao's weather evolves throughout the year, be sure to check out Koh Tao Climate.