Last updated: August 27, 2025
Experience the tropical allure of Ko Samui, Thailand, in July, where the temperatures bask in warmth, averaging 28°C (83°F), with highs reaching up to 31°C (88°F) and lows settling around 26°C (80°F). While the island enjoys its lush landscapes, visitors should prepare for the occasional rain, with an average precipitation of 79 mm (3.1 in) spread across about 17 days of the month. The humidity levels hover around a balmy 86%, contributing to the rich, verdant environment that makes Ko Samui a paradise for nature lovers. Embrace the vibrant island life, but don’t forget your umbrella!
In July, Ko Samui continues to bask in the warm embrace of tropical weather, with temperatures averaging around 28°C (83°F). This month showcases slightly cooler minimums of 26°C (80°F) and a comfortable maximum reaching 31°C (88°F). As the hot season progresses, July reflects a stable climate pattern, maintaining similar temperatures to the months preceding it. Visitors can expect a delightful blend of warmth and sunshine, perfect for beach lounging and exploring the island’s lush landscapes. With humidity levels typical of the season, it's a great time to enjoy the beautiful surroundings, making Ko Samui a wonderful escape in the heart of summer.
In July, Ko Samui experiences moderate precipitation, with an average of 79 mm (3.1 in) of rain over 17 days. While this amount signifies a slight dip from the wetter months preceding it, July still contributes to the island's lush greenery and vibrant landscapes. Following a pattern seen from May to June, the frequency of rainy days remains relatively consistent, allowing for ample opportunity to enjoy both the tropical scenery and the occasional refreshing downpour. As the month transitions into August, precipitation levels stabilize, emphasizing the island's tropical climate and setting the stage for the wetter conditions that often characterize the latter part of the year.
In July, Ko Samui, Thailand experiences high humidity levels, reaching 86%, which mirrors the sweltering pattern seen in June. This trend marks the beginning of the island's peak humidity season, peaking in August at a notable 88%. The months leading up to July, particularly May with 77%, hint at the gradual increase in moisture, while the preceding months of January to April showcase a much more comfortable range between 68% and 72%. As the summer progresses, visitors should prepare for the lush, tropical atmosphere that accompanies these elevated humidity levels.
In July, the UV Index in Ko Samui, Thailand reaches 14, categorizing it as extreme exposure, with a burn time of just 10 minutes for unprotected skin. This trend of high UV levels persists through the summer months, with similar readings in June and continuing into August and September. The consistent extreme UV Index throughout this period highlights the importance of sun protection for visitors and locals alike. Travelers should be mindful of the sun's intensity, ensuring they take precautions such as wearing sunscreen and protective clothing. For more detailed information on the UV Index throughout the year, visit Ko Samui UV Index.
UV Risk Categories
In July, the sun graces Ko Samui, Thailand with a delightful average of 314 hours of sunshine, making it one of the sunnier months of the year. This month, while slightly lower than the sun-drenched peaks of March and May, still showcases a commendable amount of radiant days, inviting visitors to enjoy outdoor adventures and beach escapades. As the rainy season approaches, July’s consistent sunlight serves as a warm embrace before the clouds begin to gather, ensuring that both locals and tourists alike can relish the vibrant landscapes and crystal-clear waters while basking in the tropical glow. With July's sunny charm, it proves to be an ideal time for those seeking a blend of sunshine and warmth before the shifting patterns of the months ahead.
When it comes to basking in the sun, July in Ko Samui tends to deliver a bit of a disappointment, with only an 18% chance of sunny weather. This marks a notable dip compared to the earlier months of the year, where February and March shine with 58% and 51% probabilities, respectively. As the rainy season approaches, the likelihood of clear skies decreases significantly, further plummeting to 9% in August and remaining low throughout the rest of the year. For those seeking sunshine, it’s advisable to plan your visit before June, as the summer months transition into a period where rainfall takes center stage in this beautiful Thai paradise.
In Ko Samui, Thailand, July offers a delightful 12 hours of daylight, contributing to the island's charm throughout the month. This consistent daylight duration, mirrored in August and the preceding months of March through June, reveals a pattern of moderate daylight as the year progresses. Following the sun-soaked summer peak, the days gradually shorten, returning to 11 hours in October. This stability in daylight provides plenty of time for beach lovers and adventurers alike to soak up the tropical sun and explore the island's breathtaking landscapes, making July an ideal month for outdoor activities and relaxation.
In July, Ko Samui experiences a noticeable uptick in wind speed, averaging 5.4 m/s (12 mph), which marks it as one of the breezier months of the year. This increase follows the gradual rise seen since the milder winds of April and May, where speeds hovered around 3.5 m/s (8 mph) to 4.0 m/s (9 mph). The refreshing gusts of July are a welcome change, bringing a lively atmosphere to the island and enhancing outdoor activities. Interestingly, this month and December share the highest wind speeds, suggesting a seasonal pattern that complements the island's tropical charm. As the winds shift, visitors can enjoy the vibrant ocean views and exhilarating beach experiences that make Ko Samui a year-round paradise.
Weather in Ko Samui varies notably across the year, with each month offering distinct climate conditions. This page compares July’s weather to other months in Ko Samui, focusing on differences in temperature, rainfall, humidity, and UV levels.
In comparing the weather of July and January, July tends to be slightly warmer, with average temperatures ranging from a minimum of 26°C (80°F) to a maximum of 31°C (88°F), while January has a narrower range with average temperatures from a minimum of 24°C (76°F) to a maximum of 28°C (83°F). Precipitation levels also differ, with July receiving 79 mm (3.1 in) of rain over approximately 17 days, whereas January experiences almost double the rainfall at 144 mm (5.7 in) over 13 days. Additionally, humidity is notably higher in July at 86% compared to January’s more comfortable 72%. For more detailed insights, check out Ko Samui weather in January.
When comparing the weather in July and February, July stands out with higher temperatures and increased humidity. In July, temperatures range from a minimum of 26°C (80°F) to a maximum of 31°C (88°F), with an average of 28°C (83°F). This month also experiences significant rainfall, totaling 79 mm (3.1 in) over 17 days, resulting in a humidity level of 86%. In contrast, February offers slightly cooler temperatures, ranging from 25°C (77°F) to a maximum of 28°C (83°F), with an average of 27°C (81°F). Precipitation is much lower in February, at 39 mm (1.5 in) over just 8 days, and the humidity is notably lower at 68%. For more specifics on February weather on Ko Samui, visit Ko Samui weather in February.
In comparing the weather between July and March, July tends to be warmer and more humid. With minimum temperatures of 26°C (80°F) and maximums reaching up to 31°C (88°F), July sees an average temperature similar to March's average of 28°C (82°F), but it experiences significantly higher humidity at 86%. Additionally, July has more precipitation, with a total of 79 mm (3.1 in) spread over 17 days, compared to March's 38 mm (1.5 in) over just 7 days. For more details on the conditions in March, you can check out Ko Samui weather in March.
When comparing the weather in July and April, both months share similar average temperatures, with July seeing a minimum of 26°C (80°F), and April slightly cooler at 25°C (77°F). However, July tends to be more humid, with humidity levels reaching 86%, compared to April's more comfortable 69%. Precipitation is notably higher in April, totaling 144 mm (5.7 in) over 15 days, while July experiences 79 mm (3.1 in) across 17 days. This difference highlights April as a wetter month, despite similar temperature ranges. For more detailed insights, check out Ko Samui weather in April.
In comparing the weather patterns of July and May, both months exhibit tropical warmth, with July typically experiencing minimal temperature variation. July has an average temperature ranging from 26°C (80°F) to a maximum of 31°C (88°F) and a humidity level of 86%. In contrast, May showcases slightly higher peak temperatures, with averages from 26°C (79°F) to a maximum of 32°C (89°F), but it has a higher precipitation rate of 126 mm (5.0 in) across 22 days, compared to July’s 79 mm (3.1 in) over 17 days. This results in lower humidity levels in May at 77%, making it feel relatively less muggy than July. For more details, visit Ko Samui weather in May.
In comparing the weather between June and July, we observe some notable similarities and differences. Both months have a minimum temperature of around 26°C (79°F-80°F) and an average temperature that hovers around 28°C (83°F). However, July experiences slightly lower maximum temperatures at 31°C (88°F), compared to June's peak of 32°C (89°F). Precipitation levels are higher in June with 96 mm (3.8 in) over 18 days, while July sees a decrease to 79 mm (3.1 in) over 17 days, resulting in somewhat drier conditions. Humidity remains constant at 86% for both months, contributing to the tropical feel. For more information, you can visit Ko Samui weather in June.
In comparing the weather patterns of July and August, both months showcase similar average temperatures, with a minimum of 26°C (80°F), an average of 28°C (83°F), and a maximum reaching 31°C (88°F in July and 89°F in August). Precipitation remains almost consistent, with July receiving 79 mm (3.1 in) over 17 days, while August sees a slight increase to 80 mm (3.1 in) over 18 days. Humidity experiences a marginal rise from 86% in July to 88% in August, suggesting a slightly more humid environment as summer progresses. For more detailed information on August weather specifically, check out Ko Samui weather in August.
In July, the weather showcases a warm tropical climate with temperatures ranging from a minimum of 26°C (80°F) to a maximum of 31°C (88°F) and an average of 28°C (83°F). Precipitation is relatively lower at 79 mm (3.1 in) and occurs over 17 days, accompanied by a high humidity level of 86%. In contrast, September experiences similar minimum temperatures, but the overall max temperature is slightly lower at 30°C (86°F). Notably, September sees a marked increase in rainfall, with precipitation swelling to 151 mm (5.9 in) over 21 days, coupled with a slightly higher humidity at 87%. For more details on what to expect, check out Ko Samui weather in September.
In July, the weather is characterized by warm temperatures, with a minimum of 26°C (80°F) and an average of 28°C (83°F), peaking at 31°C (88°F). The month experiences moderate rainfall, with 79 mm (3.1 in) spread over 17 days, and consistent humidity levels around 86%. In contrast, October sees slightly cooler temperatures, with a minimum of 25°C (77°F) and an average of 27°C (81°F), reaching a maximum of 30°C (85°F). However, October is significantly wetter, receiving 241 mm (9.5 in) of precipitation over 28 days, while maintaining the same humidity levels of 86%. For more details about the weather during this month, visit Ko Samui weather in October.
In July, the weather features warm temperatures with a minimum of 26°C (80°F), averaging 28°C (83°F), and reaching a maximum of 31°C (88°F). The month sees relatively less rainfall, with 79 mm (3.1 in) spread over 17 days, and humidity at a high of 86%. In contrast, November brings slightly cooler temperatures, with a minimum of 25°C (77°F) and an average of 27°C (81°F), peaking at 29°C (85°F). However, November is much wetter, accumulating 336 mm (13.2 in) of rain over 24 days, accompanied by a slightly higher humidity of 87%. For a detailed look at the weather specifics, you can explore Ko Samui weather in November.
In July, the weather typically features warm temperatures, with a minimum of 26°C (80°F), an average of 28°C (83°F), and a maximum of 31°C (88°F). The month experiences significant rainfall, totaling 79 mm (3.1 in) over 17 days, alongside high humidity levels of 86%.
In contrast, December brings slightly cooler conditions, where temperatures range from a minimum of 24°C (76°F) to an average of 27°C (80°F) and a maximum of 29°C (84°F). However, December is much wetter, with precipitation totaling 207 mm (8.1 in) over the same number of days, though humidity remains relatively lower at 83%.
For more detailed information, you can visit Ko Samui weather in December.
In July, Ko Samui welcomes a warm tropical climate, but it's notably wetter than other months, with humidity levels soaring to around 86%. While temperatures remain consistently high, averaging around 28°C (83°F), the island experiences an increase in rainfall, with about 17 days seeing precipitation. This makes July a transitional month; despite the warmth, visitors should prepare for occasional showers that can bring refreshing relief from the heat. For a complete understanding of Ko Samui's weather patterns, check out the detailed insights at Ko Samui Climate.