March Weather in Ko Samui, Thailand

Last updated: August 27, 2025

March in Ko Samui, Thailand offers a delightful tropical experience, with average temperatures hovering around 28°C (82°F) and maximums reaching 30°C (86°F), creating a warm and inviting atmosphere. Daily lows dip to a comfortable 25°C (78°F), perfect for enjoying the island’s stunning beaches. Expect occasional showers, as the month brings about 38 mm (1.5 in) of precipitation over approximately 7 days, while the humidity settles at a balmy 68%. Whether lounging in the sun or exploring lush landscapes, March showcases the vibrant allure of this beautiful destination.

March Temperature in Ko Samui

March in Ko Samui, Thailand, heralds the transition into warmer days, as the island's temperatures start to rise pleasantly. With minimums around 25°C (78°F) and averaging 28°C (82°F), visitors can expect a comfortable climate ideal for beach lounging and outdoor activities. As the month progresses, the maximum temperatures flirt with 30°C (86°F), hinting at the approaching summer. This gentle warmth is a delightful continuation from the cooler months of January and February, making March a particularly inviting time to explore the vibrant beauty of Ko Samui, where the sun shines brighter and the sea beckons invitingly.

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

The chart illustrates March 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, March 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.

March Precipitation in Ko Samui

In March, Ko Samui experiences a slight dip in rainfall, with precipitation amounting to just 38 mm (1.5 in) over about 7 days. This marks a continuation of the relatively dry season that starts in February, characterized by significantly lower rainfall compared to the preceding months. January witnesses a high of 144 mm (5.7 in), while February sees a dramatic decrease to 39 mm (1.5 in), indicating a transition toward drier weather. As spring unfolds, March typically offers a reprieve before the more humid months of April and May, when precipitation levels rise again. This month balances sunny days with the occasional refreshing shower, making it an appealing time for visitors to enjoy the island's natural beauty while avoiding the heavier rains that come later in the year.

March Precipitation Trends in Ko Samui

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

March in Ko Samui, Thailand, greets visitors with a comfortable humidity of 68%, maintaining the trend of mild moisture levels that began in February. This month marks a transition as the island's humidity begins to rise subtly, leading up to the more humid months of April and May. While March offers a pleasant environment for exploration and relaxation, the gradual increase hints at the approaching tropical climate, providing a taste of what is to come. As summer approaches, the humidity will climb, peaking in the mid-year months, but March remains an ideal time for those seeking warmth without the heavier moisture.

March Average Humidity in Ko Samui

This chart illustrates the average monthly humidity levels in Ko Samui, with March’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In March, 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 March generated using information from the Copernicus Climate Change Service.

March UV Index in Ko Samui

In March, Ko Samui, Thailand continues to experience intense sun exposure, with a UV Index peaking at 15, classified as extreme. This marks the second consecutive month at this heightened level, following February's UV Index of 14. With a consistent burn time of just 10 minutes, it’s crucial for visitors and locals alike to take protective measures against the sun's harmful rays. As the season progresses into April, the UV Index remains steady at 15, indicating a robust trend of high solar intensity during this period. For those looking to enjoy the island's beautiful beaches and outdoor adventures, staying informed about the UV conditions is essential. For more detailed information, check out the Ko Samui UV Index.

Maximum UV Index Levels in Ko Samui for March

The chart shows the monthly maximum UV Index (UVI) for Ko Samui in March, 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 March, the maximum UV index in Ko Samui typically reaches {2}, which falls under the {3} exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec111415151413141414141111
Data source: Ko Samui March 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.

March Sunshine in Ko Samui

March in Ko Samui, Thailand, shines particularly bright with an impressive 346 hours of sunshine, marking it as one of the sunniest months of the year. This delightful increase from 308 hours in February to March’s generous offering suggests that springtime is truly here, inviting travelers to bask in the warm rays. Following March, the sunshine hours gradually taper off to 318 hours in April but remain plentiful, demonstrating the island's consistency in providing lusciously sunny days throughout the early months of the year. The overall trend displays a robust pattern of abundant sunshine that keeps the allure of this tropical paradise glowing.

Monthly Sunshine Duration in Ko Samui: March Highlighted

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

Chance of Sun in Ko Samui During March

The likelihood of sunny weather in Ko Samui, Thailand, showcases intriguing seasonal trends. While January experiences a modest 32% chance of sunshine, this figure nearly doubles in February, reaching 58%—the highest for the year. As March rolls in, the chance of sun dips slightly to 51%, offering a balanced mix of bright days and occasional clouds. However, this more favorable weather quickly gives way to April's drop back to 32% and a gradual decline through the summer months, where the chances plummet to just 18% in July. This trend underscores the importance of planning your trip thoughtfully, as early months provide a more promising prospect for sun-soaked adventures.

Percentage of Sunny Days in March in Ko Samui

The chart illustrates the percentage of sunny days in Ko Samui throughout the year, with March 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 March chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Ko Samui in March

March marks a delightful transition in Ko Samui, Thailand, as daylight stretches to 12 hours, embracing the island in more sunshine than the earlier months of the year. Following the steady 11 hours of daylight in both January and February, the increase not only reflects the approach of summer but also invites both relaxation and adventure for visitors. As April and May continue this trend, maintaining the 12-hour daylight duration, the longer days provide ample opportunity to explore the stunning beaches, vibrant local culture, and spectacular sunsets. By June through September, this consistency in daylight further enhances the appeal of Ko Samui, ensuring that guests can make the most of each sun-soaked moment before a gradual decrease in daylight returns with October.

Average Daylight Hours in Ko Samui for March

The chart illustrates the variation in daylight duration in Ko Samui throughout the year, with March 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.

March Winds in Ko Samui

As March unfolds in Ko Samui, Thailand, the island experiences a gentle shift in wind patterns, registering an average speed of 4.6 m/s (10 mph). This marks a slight decrease from the preceding months of January and February, where winds greeted visitors with averages of 5.2 m/s and 5.0 m/s, respectively. The tranquil breezes of March make it an ideal time for beachgoers and outdoor enthusiasts to enjoy the stunning coastline without the overpowering gusts typical of earlier in the year. As the month transitions into April, winds relax further to around 3.5 m/s (8 mph), suggesting a mellow atmosphere that perfectly complements the island's serene charm. Notably, as summer approaches, we can anticipate a gradual uptick in wind speeds in the following months, creating a dynamic yet refreshing coastal experience.

Average March Wind Speed in Ko Samui

The chart displays monthly wind speed patterns in Ko Samui, with values for each month shown alongside March's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how March's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec5.25.04.6 m/s3.54.04.85.44.74.54.75.05.4
Data source: Ko Samui March wind data, generated using information from the Copernicus Climate Change Service.

How March 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 March’s weather to other months in Ko Samui, focusing on differences in temperature, rainfall, humidity, and UV levels.

March and January present notable differences in weather patterns. March tends to be slightly warmer, with average temperatures reaching 28°C (82°F) compared to January’s 27°C (80°F). However, January experiences significantly more precipitation, with 144 mm (5.7 in) falling over 13 days, while March sees just 38 mm (1.5 in) over 7 days, indicating a drier climate as the year progresses. Additionally, humidity levels remain relatively high in both months, with January at 72% and March at 68%. For a more detailed look at January weather, you can refer to the following link: Ko Samui weather in January.

In comparing the weather conditions of March and February, both months exhibit warm temperatures with only slight variations. March experiences a minimum temperature of 25°C (78°F), an average of 28°C (82°F), and a maximum of 30°C (86°F), while February has similar temperatures with a minimum of 25°C (77°F), an average of 27°C (81°F), and a maximum of 28°C (83°F). Precipitation levels are quite close, with March receiving 38 mm (1.5 in) over 7 days and February experiencing 39 mm (1.5 in) across 8 days. Notably, humidity remains consistent at 68% for both months, providing a sticky atmosphere typical of the region. For a more detailed look at February's weather, you can check Ko Samui weather in February.

In March, the weather is generally warm with temperatures ranging from a minimum of 25°C (78°F) to a maximum of 30°C (86°F). The month experiences an average temperature of 28°C (82°F) and sees about 38 mm (1.5 in) of precipitation over 7 days, accompanied by a humidity level of 68%. In contrast, April brings slightly warmer conditions, with maximum temperatures reaching 31°C (88°F) and an average of 28°C (83°F). However, it also experiences significantly higher rainfall, totaling 144 mm (5.7 in) over 15 days, while humidity remains relatively stable at 69%. For more detailed insights, you can check Ko Samui weather in April.

In March, the weather is warm and relatively dry, with temperatures ranging from a minimum of 25°C (78°F) to a maximum of 30°C (86°F) and an average of 28°C (82°F). The month sees about 38 mm (1.5 in) of precipitation over 7 days and has a humidity level of 68%. In contrast, May experiences slightly warmer temperatures, with a minimum of 26°C (79°F), an average of 28°C (84°F), and a maximum of 32°C (89°F). However, May is significantly wetter, receiving 126 mm (5.0 in) of rainfall over 22 days, resulting in a higher humidity of 77%. For more details about the weather conditions during this month, you can visit Ko Samui weather in May.

In comparing the weather between March and June, we notice some notable differences. March typically boasts warmer temperatures with a minimum of 25°C (78°F) and a maximum of 30°C (86°F), while June sees slightly higher maximum temperatures at 32°C (89°F), with a minimum of 26°C (79°F). However, June experiences significantly more rainfall, with a total of 96 mm (3.8 in) spread over 18 days, compared to March's 38 mm (1.5 in) over just 7 days. Additionally, humidity levels rise in June to 86%, up from March's 68%, making the latter part of spring feel more oppressive. For a detailed look at the weather specifics, you can refer to Ko Samui weather in June.

In March, temperatures in Ko Samui 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). The month experiences some rainfall, totaling 38 mm (1.5 in) over about 7 days and humidity levels are moderate at 68%. In contrast, July sees slightly warmer temperatures, with a minimum of 26°C (80°F) and a maximum of 31°C (88°F), along with an average of 28°C (83°F). However, July is notably wetter, with precipitation reaching 79 mm (3.1 in) over 17 days, and higher humidity at 86%. For more details, check out Ko Samui weather in July.

In March, the weather is warm with minimum temperatures around 25°C (78°F) and maximums reaching up to 30°C (86°F), averaging 28°C (82°F). This month experiences relatively low precipitation, totaling 38 mm (1.5 in) over 7 days, and humidity levels are at 68%.

Conversely, August offers slightly higher minimum temperatures at 26°C (79°F) and a peak of 31°C (89°F), with an average temperature of 28°C (83°F). However, it is also wetter, with 80 mm (3.1 in) of rainfall spread over 18 days and higher humidity at 88%. For more insights, check out Ko Samui weather in August.

March and September exhibit similar temperature ranges, with both months seeing minimums around 25-26°C (78°F), averages of 28°C (82°F), and maximums reaching 30°C (86°F). However, September is marked by significantly higher precipitation, averaging 151 mm (5.9 in) over 21 days, compared to March's 38 mm (1.5 in) over just 7 days. The humidity also rises from 68% in March to 87% in September, contributing to a noticeably more humid atmosphere during the latter month. For more details on September weather, you can check Ko Samui weather in September.

In March, the weather is predominantly warm, with temperatures ranging from a minimum of 25°C (78°F) to a maximum of 30°C (86°F) and an average of 28°C (82°F). The month sees relatively low precipitation of 38 mm (1.5 in) over about seven days, accompanied by a humidity level of 68%. In contrast, October experiences similar minimum temperatures but a slightly lower average of 27°C (81°F) and maximum of 30°C (85°F). However, it is significantly wetter, with precipitation totaling 241 mm (9.5 in) spread across 28 days and humidity rising to 86%. For more details, check out Ko Samui weather in October.

In March, the weather is generally warm and dry, with temperatures ranging from a minimum of 25°C (78°F) to a maximum of 30°C (86°F) and average humidity at 68%. Precipitation is relatively low, totaling 38 mm (1.5 in) over about 7 days. In contrast, November sees a noticeable increase in humidity at 87% alongside higher rainfall, with a staggering 336 mm (13.2 in) falling over 24 days. Temperatures in November are slightly cooler, averaging 27°C (81°F), with a range similar to March. For more details on the rainforest-like weather typical of November, check out Ko Samui weather in November.

In March, the weather is warm and pleasant, with average temperatures ranging from 25°C (78°F) to a high of 30°C (86°F). The month sees less precipitation, totaling 38 mm (1.5 in) over about 7 days, and the humidity levels are relatively moderate at 68%. In contrast, December brings similarly warm temperatures, with minimums around 24°C (76°F) and maximums reaching 29°C (84°F). However, it is significantly wetter, with total rainfall of 207 mm (8.1 in) spread over 17 days, and humidity levels rising to 83%. For more insights on how December weather unfolds, visit Ko Samui weather in December.

Compare Ko Samui's Climate with Cities Worldwide

Conclusion: What to Expect From March Weather in Ko Samui

As March unfolds in Ko Samui, visitors can expect warm temperatures that are pleasantly consistent, hovering around a comfortable average of 28°C (82°F). Unlike the cooler winter months, March offers a more muggy atmosphere, with humidity levels rising to 68%. While precipitation remains relatively low with only a few days of rain, the island begins to transition into its drier season. This makes March a particularly appealing time to enjoy outdoor activities and bask in the tropical sun. For a detailed look at the island's distinct weather patterns throughout the year, explore Ko Samui Climate.