October Weather in Ko Samui, Thailand

Last updated: August 27, 2025

In October, the tropical paradise of Ko Samui, Thailand experiences a warm and humid climate, with temperatures ranging from a minimum of 25°C (77°F) to a maximum of 30°C (85°F), and an average temperature of around 27°C (81°F). This month is marked by significant rainfall, with a total precipitation of 241 mm (9.5 in) spread over 28 days, resulting in the lush, vibrant landscapes that the island is known for. Visitors should be prepared for the high humidity levels, averaging 86%, which can enhance the tropical experience while influencing daily activities. Despite the frequent showers, October still offers opportunities to explore the island’s natural beauty and cultural attractions.

October Temperature in Ko Samui

In October, Ko Samui experiences pleasantly warm temperatures, with minimums around 25°C (77°F) and averages hovering at 27°C (81°F). As the month progresses, the maximums reach up to 30°C (85°F), making it an inviting time for beachgoers and adventurers alike. The climate remains consistent, reflecting a trend of stable warmth that characterizes the island throughout the year. Compared to the preceding months, October sees a slight dip in maximum temperatures, signaling a gentle transition into the cooler season, yet still providing ample sunshine and tropical charm for visitors looking to escape the chill elsewhere.

October Weather in Ko Samui: Daily Temperature Highs, Lows, and Averages

The chart illustrates October temperature patterns in Ko Samui, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Ko Samui, October typically has an average temperature of {2}°C ({3}°F), with highs reaching up to {4}°C ({5}°F) and lows dropping to around {6}°C ({7}°F).
JanFebMarAprMayJunJulAugSepOctNovDec808182838383838282818180
Data source: Temperature data for Ko Samui generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

October Precipitation in Ko Samui

October marks a significant shift in Ko Samui's weather patterns, as the island experiences one of its highest precipitation levels of the year with 241 mm (9.5 in) of rain spread over 28 days. This increase is evident when compared to previous months, particularly September, which saw 151 mm (5.9 in) of rain over just 21 days. The trend highlights October as a particularly wet month, paving the way for the even wetter November that follows, with its 336 mm (13.2 in) of rainfall. As the rainy season takes hold, travelers should prepare for lush landscapes and the vibrant atmosphere that accompanies the island's transformation, emphasizing the balance between rain and the beauty of Ko Samui’s tropical allure.

October Precipitation Trends in Ko Samui

The chart displays monthly precipitation patterns in Ko Samui, with values for each month alongside October’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how October’s conditions compare to those of other months. In Ko Samui, October typically receives around {2} mm ({3} inches) of precipitation spread over approximately {4} days.
JanFebMarAprMayJunJulAugSepOctNovDec1443938144126967980151241336207
Data source: Precipitation data for October generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

October Humidity in Ko Samui

In October, Ko Samui experiences a high humidity level of 86%, continuing the trend set in the previous months of the rainy season. After a drier start to the year, with January's humidity at 72%, the island witnesses a steady increase, peaking in August at 88%. As the monsoon persists into October, humidity remains consistently elevated, comparable to July and June, both also registering 86%. This high humidity paired with warm temperatures creates a tropical climate, making October a time when visitors can expect lush landscapes, vibrant nightlife, and occasional rains, offering a unique experience on this beautiful island.

October Average Humidity in Ko Samui

This chart illustrates the average monthly humidity levels in Ko Samui, with October’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In October, average humidity in Ko Samui is approximately {2}%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec72%68%68%69%77%86%86%88%87%86%87%84%
Data source: Humidity data for October generated using information from the Copernicus Climate Change Service.

October UV Index in Ko Samui

In October, visitors to Ko Samui, Thailand should be prepared for high sun exposure, as the UV Index maintains a significant 14, categorizing it as extreme. This level of UV radiation is consistent with the preceding months, creating a pattern of intense sun that spans from February to October, where the burn time remains notably quick at just 10 minutes. Notably, even in November, the UV Index drops to 11, indicating that the sun’s potency remains a consideration for travelers. With such elevated readings throughout the year, it’s crucial for beachgoers and adventurers alike to prioritize sun protection and stay aware of UV levels. For detailed information on the UV Index in Ko Samui, visit Ko Samui UV Index.

Maximum UV Index Levels in Ko Samui for October

The chart shows the monthly maximum UV Index (UVI) for Ko Samui in October, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In October, the maximum UV index in Ko Samui typically reaches {2}, which falls under the {3} exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec111415151413141414141111
Data source: Ko Samui October UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

October Sunshine in Ko Samui

As October graces Ko Samui, Thailand, it continues to offer a delightful blend of sunshine, boasting 287 hours of sunlight. While slightly lower than previous months like May and March, which basked in their peak with 331 and 346 hours respectively, October still holds its own in the annual sunshine tally. The transition into the final quarter of the year reveals a pattern: the island generally enjoys a gradual decline in sunlight hours from the peak summer months, yet it remains significantly brighter than the dreary days many experience elsewhere. This gentle dip in sunshine hours hints at the approaching monsoon season, making October a splendid time for both relaxation and adventure in this tropical paradise. Thus, while the days may shorten, the allure of Ko Samui’s warmth and vibrant atmosphere remains ever-present.

Monthly Sunshine Duration in Ko Samui: October Highlighted

The October sunshine duration represents the total number of hours Ko Samui experiences direct sunlight during the month of October, excluding cloudy or obstructed periods. This chart compares the sunshine duration of October with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec252h308h346h318h331h308h314h300h286h287h289h302h
Data source: Ko Samui October Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Ko Samui During October

In Ko Samui, Thailand, the likelihood of sunny weather in October dips significantly, with only an 11% chance of clear skies. This trend reflects a broader pattern of declining sunshine as the year progresses, particularly after the peak of sunshine seen in February at 58%. By the time October arrives, residents and visitors alike experience the transition into the rainy season, which sees September and October both hovering around similar low probabilities for sun. As the year winds down, the chances of sunshine won't noticeably improve until the following year, with December jumping back to 39%. So, if you’re dreaming of basking in the sun in October, it might be worth considering other months for your tropical getaway.

Percentage of Sunny Days in October in Ko Samui

The chart illustrates the percentage of sunny days in Ko Samui throughout the year, with October highlighted. It highlights the variation in sunshine across each month and provides an overview of the typical frequency of sunny days, offering insights into how often Ko Samui experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec32%58%52%32%21%22%18%9%11%11%8%39%
Data source: Ko Samui October chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Ko Samui in October

In Ko Samui, Thailand, October marks a subtle transition in daylight duration, offering about 11 hours of sunlight each day. This slight decrease from the previous months, which bask in 12-hour stretches of daylight from March to September, highlights the island's gentle shift towards its cooler seasons. As the year winds down, daylight returns to the consistency of earlier months, creating an inviting atmosphere for travel and exploration. Whether you're indulging in the vibrant nightlife or lounging on the sun-soaked beaches, the balanced daylight hours in October set the perfect backdrop for enjoying the natural beauty of this tropical paradise.

Average Daylight Hours in Ko Samui for October

The chart illustrates the variation in daylight duration in Ko Samui throughout the year, with October highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec11h 37m11h 48m12h 3m12h 19m12h 32m12h 39m12h 36m12h 24m12h 9m11h 53m11h 40m11h 33m
Data source: Ko Samui daylight hours, calculated by summing the hours between sunrise and sunset for each day.

October Winds in Ko Samui

As October breezes in Ko Samui, the island experiences a delightful average wind speed of 4.7 m/s (10 mph), mirroring the gentle yet invigorating air that characterizes the transition into the late monsoon season. This month maintains a consistent breeze, similar to September's calm, enhancing the island’s tranquil atmosphere. Notably, as the year progresses from the lower winds of April to the more spirited gusts of December, October represents a sweet spot where nature offers a perfect blend of relaxation and refreshment. Visitors can savor the soft winds while enjoying beachside activities, making it an ideal time to experience the serene charm of Ko Samui.

Average October Wind Speed in Ko Samui

The chart displays monthly wind speed patterns in Ko Samui, with values for each month shown alongside October's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how October's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec5.25.04.63.54.04.85.44.74.54.7 m/s5.05.4
Data source: Ko Samui October wind data, generated using information from the Copernicus Climate Change Service.

How October Weather in Ko Samui Compares to Other Months

Weather in Ko Samui varies notably across the year, with each month offering distinct climate conditions. This page compares October’s weather to other months in Ko Samui, focusing on differences in temperature, rainfall, humidity, and UV levels.

October weather features warmer temperatures, with a minimum of 25°C (77°F) and an average of 27°C (81°F), peaking at 30°C (85°F). However, it is also marked by significantly higher precipitation, totaling 241 mm (9.5 in) over 28 days, coupled with high humidity levels averaging 86%. In contrast, January offers slightly cooler temperatures, with minimums of 24°C (76°F) and a maximum of 28°C (83°F), along with much lower rainfall of 144 mm (5.7 in) spread across just 13 days. The humidity also drops to a more comfortable 72%. For more detailed insights on January weather, you can explore Ko Samui weather in January.

In comparing the weather of October and February, both months share similar temperature ranges, with a minimum of 25°C (77°F) and an average of 27°C (81°F). However, October is distinctly wetter, experiencing a total precipitation of 241 mm (9.5 in) across 28 days, compared to February's modest 39 mm (1.5 in) over just 8 days. Additionally, the humidity in October is significantly higher at 86%, while February sees a more comfortable 68%. For more insights on February weather, you can check Ko Samui weather in February.

In October, the weather is characterized by higher humidity and significantly more rainfall, with an average temperature of 27°C (81°F) and precipitation reaching 241 mm over 28 days. In contrast, March offers slightly warmer average temperatures at 28°C (82°F) but experiences far less rain, totaling only 38 mm across 7 days, and a more comfortable humidity level of 68%. This makes March a more pleasant month for outdoor activities. For a detailed look at the weather conditions, you can visit Ko Samui weather in March.

When comparing the weather in October and April, one notable difference is the precipitation level. October experiences significantly higher rainfall, averaging 241 mm (9.5 in) over 28 days, while April sees much less precipitation at 144 mm (5.7 in) across only 15 days. Additionally, October has a higher humidity level of 86%, making it feel more oppressive compared to April's wetter but less humid atmosphere, which sits at 69%. On the temperature front, both months are quite similar, with April slightly warmer, averaging around 28°C (83°F) compared to October's average of 27°C (81°F). For more details about April weather conditions, you can check Ko Samui weather in April.

When comparing the weather in October and May, October tends to be slightly cooler, with average temperatures ranging from a minimum of 25°C (77°F) to a maximum of 30°C (85°F). In contrast, May offers warmer temperatures, with an average range from 26°C (79°F) to a peak of 32°C (89°F). Additionally, October experiences significantly higher precipitation, totaling 241 mm (9.5 in) over 28 days, while May has only 126 mm (5.0 in) over 22 days, making it generally drier. The humidity in October is also higher at 86%, compared to May's 77%. For more details on May weather, you can visit Ko Samui weather in May.

In comparing the weather between October and June, both months exhibit warm temperatures with October experiencing slightly cooler averages. October’s minimum temperature is 25°C (77°F) and averages around 27°C (81°F), while June starts at a minimum of 26°C (79°F) and averages at 28°C (84°F). However, October is marked by significantly higher rainfall, with a total of 241 mm (9.5 in) over 28 days, compared to June's 96 mm (3.8 in) over just 18 days. Interestingly, both months maintain the same humidity level of 86%, making them equally humid despite the differences in rainfall and temperature. For a more detailed view of June's weather, visit Ko Samui weather in June.

When comparing the weather in October and July, October generally experiences slightly cooler temperatures, with a minimum of 25°C (77°F) and a maximum of 30°C (85°F) compared to July's minimum of 26°C (80°F) and maximum of 31°C (88°F). However, October is significantly wetter, receiving 241 mm (9.5 in) of rainfall over 28 days, while July sees only 79 mm (3.1 in) over 17 days. Humidity remains consistent at 86% for both months. For more detailed information on July weather, you can visit Ko Samui weather in July.

In comparing the weather between October and August, October tends to have slightly cooler temperatures, with an average of 27°C (81°F) compared to August's 28°C (83°F). While the minimum and maximum temperatures are also marginally lower in October, the month experiences significantly higher precipitation levels, totaling 241 mm (9.5 in) over 28 days, compared to August's 80 mm (3.1 in) over 18 days. Humidity is relatively constant, with October at 86% and August at 88%. This difference in rainfall and slightly lower temperatures make October feel more humid despite the similar humidity levels. For more detailed weather insights, you can check Ko Samui weather in August.

In comparing the weather between September and October, both months experience warm temperatures, with October showing a slight decrease in minimum and average temperatures. October has a minimum temperature of 25°C (77°F) and an average of 27°C (81°F), while September maintains slightly higher figures at a minimum of 26°C (78°F) and an average of 28°C (82°F). However, the precipitation level rises significantly in October, reaching 241 mm (9.5 in) spread over 28 days, compared to September’s 151 mm (5.9 in) over 21 days. Additionally, humidity levels are similar, with October at 86% and September slightly higher at 87%. For more detailed insights into September's weather, you can visit Ko Samui weather in September.

In October, the weather features warm temperatures with a minimum of 25°C (77°F) and an average of 27°C (81°F), peaking at 30°C (85°F). However, the month sees significant rainfall totaling 241 mm (9.5 in) across 28 days, accompanied by high humidity levels of 86%.

Comparatively, November experiences a similar temperature range, with a minimum of 25°C (77°F) and an average of 27°C (81°F), but slightly cooler at a maximum of 29°C (85°F). Rainfall increases to 336 mm (13.2 in), occurring over 24 days, while humidity rises minimally to 87%.

For more detailed insights, visit Ko Samui weather in November.

October and December exhibit quite similar weather patterns, with average temperatures ranging from 27°C (81°F) in both months. However, October tends to be slightly warmer during the day with maximum temperatures reaching 30°C (85°F) compared to December's peak of 29°C (84°F). Notably, October experiences significantly higher precipitation, with 241 mm (9.5 in) over 28 days, while December sees less rain at 207 mm (8.1 in) across just 17 days. Additionally, humidity levels are marginally higher in October at 86%, as opposed to 83% in December. For more details on December weather, you can visit Ko Samui weather in December.

Compare Ko Samui's Climate with Cities Worldwide

Conclusion: What to Expect From October Weather in Ko Samui

October in Ko Samui marks a transition into the wet season, characterized by higher humidity levels and frequent rainfall. While temperatures remain warm, averaging around 27°C, the month sees a significant uptick in precipitation, with rain making an appearance on nearly every day. This creates a lush, vibrant landscape but can also affect outdoor activities. Compared to the drier months, October is a time when visitors should be prepared for sudden showers and embrace the island's lush scenery. For those looking to understand the climate nuances, further details can be found at Ko Samui Climate.