May weather forecast
Phuket, Thailand

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Beautiful long tail boats on the white sandy shores of a beach in Phuket, Thailand
Beautiful long tail boats on the white sandy shores of a beach in Phuket, Thailand

Weather in May

May’s weather in Phuket signals the arrival of monsoon season. Temperatures, still high at 32.8°C (91°F), become less of a focal point as precipitation escalates sharply reaching a whopping 260mm (10.24"). This heightened rainfall contributes to peak humidity levels. Its effect, however, is moderated by fewer hours of sunshine and relatively warmer sea conditions. As May hands over to June, the frequency of rainfall days heightens.

Temperature

The arrival of May in Phuket brings an average high-temperature of a still tropical 32.8°C (91°F), subtly diverging from April's 33.9°C (93°F). Throughout May nights, Phuket registers an average low-temperature of 25.6°C (78.1°F).

Heat index

For May, the heat index is estimated at a burning hot 47°C (116.6°F). Stay vigilant: Heat cramps along with heat exhaustion are expected. Heatstroke may follow prolonged exertion.
Know that the heat index computations account for shaded terrains and slight winds. When under direct sunshine, the heat index may be elevated by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is a numerical representation of warmth when taking temperature and moisture levels into account. Factors such as metabolic variation, pregnancy, and physical activity play a role in one's impression of weather. Do note, being directly under sun rays can amplify the heat you feel, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold great significance to children. Children typically face more danger than adults as their sweat production is usually lower. Additionally, the bigger skin surface compared to their small size and the increased heat due to their activeness exacerbate the risk.
The process of perspiration is vital for the human body to get rid of excess warmth by allowing sweat to evaporate. Increased relative humidity interferes with body cooling by slowing the rate of evaporation, resulting in a slower body cooling rate and a heightened feeling of heat. The body faces dehydration threats when its cooling efforts are outpaced by excessive heat gain.

Humidity

In May, the average relative humidity in Phuket is 79%.

Rainfall

In Phuket, Thailand, in May, it is raining for 21 days, with typically 260mm (10.24") of accumulated precipitation. In Phuket, Thailand, during the entire year, the rain falls for 170 days and collects up to 2220mm (87.4") of precipitation.

Sea temperature

April through June, with an average sea temperature of 30°C (86°F), are months with the warmest seawater.
Note: Seeking a refreshing experience in waters over 30°C (86°F) can be challenging.

Daylight

The average length of the day in May is 12h and 29min.
On the first day of May in Phuket, Thailand, sunrise is at 06:11 and sunset at 18:35. On the last day of the month, sunrise is at 06:07 and sunset at 18:41 +07.

Sunshine

The average sunshine in May is 6.1h.

UV index

The months with the highest UV index are February through October, with an average maximum UV index of 12. A UV Index value of 11, and more, symbolizes an ultimate health vulnerability from exposure to the Sun's UV rays for average individuals.
Note: The maximum daily UV index of 12 in May interprets into the following recommendations:
Undertake all critical precautions. Protection from sun harm is vital. Stay in the shade and avoid direct Sun exposure from 10 a.m. to 4 p.m., a period when UV radiation is particularly strong, noting that parasols or canopies may not offer total sun protection. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat. Apply and frequently reapply a broad-spectrum SPF 30+ sunscreen after every two hours, or immediately after a swim or outdoor exercise. Caution! The Sun's UV intensity grows with reflections off sand and water.

Frequently asked questions

How hot does it get in Phuket in May?

In May, the average high-temperature and low-temperature in Phuket are 32.8°C (91°F) and 25.6°C (78.1°F) respectively. The average heat index (a.k.a. 'real feel', 'felt air temperature'), which takes the relative humidity and factors it into the air temperature reading, in May is estimated at 47°C (116.6°F).

What is the average humidity in May in Phuket?

In Phuket, the average relative humidity in May is 79%.

How many days does it rain in May in Phuket?

In Phuket, Thailand, during May, the rain falls for 21 days and regularly aggregates up to 260mm (10.24") of precipitation.

What are the months with the warmest sea water in Phuket?

The months with the warmest seawater in Phuket, Thailand, are April through June, with an average sea temperature of 30°C (86°F).

What is the sea temperature in May in Phuket?

In Phuket, the average seawater temperature in May is 30°C (86°F). For swimming, other intense water activities, temperature above 30°C (86°F) is arguably unpleasant, as the water cooling effect is missing.

How many hours of daylight does Phuket have in May?

The average day length in May in Phuket, Thailand, is 12h and 29min.

What time are sunrise and sunset in May in Phuket?

In May, on the first day of the month, sunrise is at 06:11 and sunset at 18:35. On the last day of the month, in Phuket, Thailand, sunrise is at 06:07 and sunset at 18:41 +07.

How many hours of sunshine does Phuket have in May?

In Phuket, Thailand, the average sunshine duration in May is 6.1h.

When is the highest UV index in Phuket?

The months with the highest UV index in Phuket, Thailand, are February through October, with an average maximum UV index of 12.

What is the UV index reading in May in Phuket?

The average daily maximum UV index in May in Phuket, Thailand, is 12. A UV Index value of 11, and more, symbolizes an ultimate hazard to health from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average sea temperature
Average daylight
Average sunshine
Average UV index

Average temperature in May
Phuket, Thailand

Average temperature in May - Phuket, Thailand
  • Average high temperature in May: 32.8°C

The warmest month (with the highest average high temperature) is March (34°C).
The months with the lowest average high temperature are September and October (31.5°C).

  • Average low temperature in May: 25.6°C

The month with the highest average low temperature is April (25.8°C).
The coldest month (with the lowest average low temperature) is December (24.4°C).

Average humidity in May
Phuket, Thailand

Average humidity in May - Phuket, Thailand
  • Average humidity in May: 79%

The months with the highest relative humidity are September and October (82%).
The month with the lowest relative humidity is February (69%).

Average rainfall in May
Phuket, Thailand

Average rainfall in May - Phuket, Thailand
  • Average rainfall in May: 259.5mm

The wettest month (with the highest rainfall) is September (361.2mm).
The driest month (with the least rainfall) is February (23.9mm).

Average rainfall days in May
Phuket, Thailand

Average rainfall days in May - Phuket, Thailand
  • Average rainfall days in May: 21 days

The month with the highest number of rainy days is September (23 days).
The month with the least rainy days is February (3 days).

Average sea temperature in May
Phuket, Thailand

Average sea temperature in May - Phuket, Thailand
  • Average sea temperature in May: 30°C

The best months for swimming (with the highest average sea temperature) are April, May and June (30°C).
The coldest months (with the lowest average sea temperature) are January, February and December (28°C).

Average daylight in May /
Average sunshine in May
Phuket, Thailand

Average daylight in May / Average sunshine in May - Phuket, Thailand
  • Average daylight in May: 12h and 3min

The month with the longest days is June (Average daylight: 12h and 36min).
The month with the shortest days is December (Average daylight: 11h and 42min).

  • Average sunshine in May: 6h and 1min

The month with the most sunshine is February (Average sunshine: 9h and 42min).
The month with the least sunshine is June (Average sunshine: 4h and 42min).

Average UV index in May
Phuket, Thailand

Average UV index in May - Phuket, Thailand
  • Average UV index in May: 12

The months with the highest UV index are February, March, April, May, June, July, August, September and October (UV index 12).
The month with the lowest UV index is December (UV index 10).

Phuket, Thailand

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