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Lamai Beach Weather in May

In Lamai Beach, May brings very high daytime temperatures around 31°C (88°F), with nights cooling to 28°C (82°F). Expect quite a bit of rainfall this month.

Rainfall in Lamai Beach in May

You can expect rain on around 17 days based on historical patterns, with 124 mm (4.9 in) average for the month. This is a wet month with frequent and often heavy showers. Both the number of rain days and the total rainfall are high.

Temperature in Lamai Beach in May

If you're visiting Lamai Beach in May, expect highs of 31°C (88°F) and overnight lows around 28°C (82°F). Indoor breaks or shaded spots can make the warmer part of the day much more comfortable. Nights remain warm at around 28°C (82°F). For a more comfortable sleep, a cold shower before bed and a fan or air conditioning can make a big difference.

Sunshine in Lamai Beach in May

Expect a lot of sunshine this month, with about 193 hours of sun. These sunny conditions add to the overall experience.

Average water temperature in May

The water is 29°C (84°F) — very warm by most standards. Comfortable to swim in, but not particularly refreshing if you're looking to cool off.

Our weather planner can help you find worldwide destinations with pleasant weather during this period. January and February typically offer the best weather for Lamai Beach.

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Check the conditions for any month of the year.

For a detailed overview over the year and the best time to visit Thailand, check out our Lamai Beach's climate page.

Lamai Beach Temperature in May

Min TemperatureMin Temperature 28°C (82°F)  
Max TemperatureMax Temperature 31°C (88°F)  
Water TemperatureWater Temperature 29°C (84°F) *  
Chance of RainChance of Rain 56%  
PrecipitationPrecipitation 124 mm (4.9 in)  
Rainy daysRainy days 17 days  
HumidityHumidity 80% *  
SunshineSunshine 193 hours *  
Percentage SunshinePercentage Sunshine *  
* Data from: Koh Samui, Thailand (14 KM, 8 Miles).

Daily Historical Temperatures

49-year average (1976-2025)

Based on our historical records, temperatures in Lamai Beach typically stay consistent throughout May, with daily highs averaging around 31°C (88°F). Nights are warm, with lows around 27°C (81°F).

Average temperatures in May

Daily Historical Precipitation

49-year average (1976-2025)

Average daily rainfall for each day of the month based on long-term records.

Average precipitation in May

Historical weather for Lamai Beach in May

Browse day-by-day weather records for Lamai Beach spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.

Lamai Beach historical weather extremes in May

According to our 44 years of weather records for Lamai Beach, the following extremes were recorded between 1982 and 2026.

  • On May 11, 1983, temperatures climbed to 37°C (99°F), marking the warmest May day on record.
  • Lamai Beach experienced its chilliest May day on May 17, 2009, reaching only 28°C (82°F).
  • Nighttime temperatures dropped to 23°C (73°F) on May 29, 2013, marking the coldest May night on record.

Best Places in Thailand in May

Find out more about the weather in Thailand and which places have the best travel conditions in this month. See all of Thailand in May →

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Legend perfect weather pleasant tolerable unpleasant poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).

What to Wear in Lamai Beach in May

Warm temperatures in May make for comfortable sightseeing weather. Pack breathable fabrics like cotton shirts, knee-length shorts or skirts, and comfortable walking shoes. A thin long sleeve for indoor spaces is handy. Prepare for significant rainfall with proper waterproof clothing and shoes. Expect water temperatures of around 29°C (84°F), which is ideal for taking a refreshing dip. Bring swimwear and consider packing a towel for drying off. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.

What To Do in Lamai Beach in May

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming
7/10
Cycling
7/10
Walking
7/10
Camping
7/10
Outdoor sports
7/10

Select a Month

Check the conditions for any month of the year.

For a detailed overview over the year and the best time to visit Thailand, check out our Lamai Beach's climate page.

More climate data for Lamai Beach