May weather forecast
Bangkok, Thailand

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A beautiful park outside the Wat Ratchanatdaram Temple in the heart of Bangkok, Thailand
A beautiful park outside the Wat Ratchanatdaram Temple in the heart of Bangkok, Thailand

Weather in May

Bangkok, Thailand goes through considerable meteorological changes during May. This period witnesses a massive surge in rainfall, reaching up to 248mm (9.76"), spread across a significant 16 days, marking the real onset of the monsoon season. The city, despite the decline in temperature, continues to experience high warmth, hinting at the tropical climate of Thailand. On the other hand, increased cloud cover results in reduced sunshine duration. Residents eagerly anticipate drier weather conditions as the significant rainfall continues into June.

Temperature

May brings a marginal elevation to a tropical 34.4°C (93.9°F) from April's 35.4°C (95.7°F) in Bangkok's average high-temperatures. In the month of May, an average of 26.3°C (79.3°F) marks the low-temperature.

Heat index

The average heat index in May is computed to be a blazing hot 51°C (123.8°F). Note: Heat exhaustion and heat cramps are probable. Heatstroke can follow with prolonged activity.
Know that the heat index computations account for shaded terrains and slight winds. When exposed to the direct sun, the heat index may augment by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'feels like', is achieved by amalgamating air temperature with the relative humidity readings. Factors such as metabolic variation, pregnancy, and physical activity play a role in one's impression of weather. Considering the impact of direct sunlight, it's possible for the heat index to surge by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are primarily vital for children. Children frequently do not comprehend the need for rest and hydration. Thirst is an advanced stage of dehydration - staying hydrated, especially during extended physical exercises, is essential.
To prevent overheating and help regulate its internal temperature, the human body sweat and rely on the evaporation to cool down. An elevated level of relative humidity hinders evaporation, leading to decreased heat elimination from the body, inducing a sensation of excess heat. As body temperatures escalate without effective heat release, one might face dehydration threats.

Humidity

In May, the average relative humidity is 75%.

Rainfall

In Bangkok, during May, the rain falls for 16 days and regularly aggregates up to 248mm (9.76") of precipitation. In Bangkok, during the entire year, the rain falls for 128 days and collects up to 1648mm (64.88") of precipitation.

Sea temperature

With an average sea temperature of 29.9°C (85.8°F), May is the month with the warmest seawater.
Note: In any water activity, temperatures between 25°C (77°F) and 29°C (84.2°F) are viewed as magnificent and exceptionally pleasant for prolonged enjoyment.

Daylight

The average length of the day in May is 12h and 46min.
On the first day of May, sunrise is at 05:56 and sunset at 18:33. On the last day of the month, sunrise is at 05:49 and sunset at 18:42 +07.

Sunshine

In Bangkok, the average sunshine in May is 7h.

UV index

The months with the highest UV index are February through September, with an average maximum UV index of 12. A UV Index estimate of 11, and higher, represents an extreme health hazard from unsafe exposure to UV radiation for the ordinary person.
Note: The maximum UV index, 12 during May, leads to the following recommendations:
Utilize all necessary safety measures, unprotected skin could suffer burns instantly. Avoid direct Sun exposure and stay in the shade between 10 a.m. and 4 p.m., a time when UV radiation is most intense, noting that not all shade structures offer full protection. Opt for tightly woven and loose clothing to enhance protection from the Sun. Directly after swimming or an outdoor workout, generously apply and reapply a broad-spectrum SPF 30+ sunscreen. Heads up! The reflection of sand and water notably intensifies UV rays from the Sun.

Frequently asked questions

How hot is it in May?

In Bangkok, in May, the average high-temperature is 34.4°C (93.9°F), and the average low-temperature is 26.3°C (79.3°F). In May, the average heat index (a.k.a. 'real feel', 'apparent temperature'), which combines air temperature and relative humidity, is computed to be 51°C (123.8°F).

What is the average humidity in May?

In Bangkok, the average relative humidity in May is 75%.

How much does it rain in May?

In Bangkok, during May, the rain falls for 16 days and regularly aggregates up to 248mm (9.76") of precipitation.

When is the sea warmest?

With an average sea temperature of 29.9°C (85.8°F), May is the month with the warmest seawater.

What is the water temperature in May?

In May, the average sea temperature is 29.9°C (85.8°F). For swimming, diving, and other water activities, temperatures between 25°C (77°F) and 29°C (84.2°F) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

What is the average length of the day in May?

The average day length in May is 12h and 46min.

What time are sunrise and sunset in May?

In May, on the first day of the month, sunrise is at 05:56 and sunset at 18:33. On the last day of the month, sunrise is at 05:49 and sunset at 18:42 +07.

How long on average sun shines in May in Bangkok?

The average sunshine duration in May is 7h.

What are the months with the highest UV index?

The months with the highest UV index are February through September, with an average maximum UV index of 12.

How high is the UV index in May?

In Bangkok, the average daily maximum UV index in May is 12. A UV Index of 11, and more, symbolizes an ultimate hazard to health from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average UV index

Average temperature in May
Bangkok, Thailand

Average temperature in May - Bangkok, Thailand
  • Average high temperature in May: 34.4°C

The warmest month (with the highest average high temperature) is April (35.4°C).
The month with the lowest average high temperature is December (31.7°C).

  • Average low temperature in May: 26.3°C

The month with the highest average low temperature is April (26.9°C).
The coldest month (with the lowest average low temperature) is December (22°C).

Average humidity in May
Bangkok, Thailand

Average humidity in May - Bangkok, Thailand
  • Average humidity in May: 75%

The month with the highest relative humidity is September (79%).
The month with the lowest relative humidity is December (66%).

Average rainfall in May
Bangkok, Thailand

Average rainfall in May - Bangkok, Thailand
  • Average rainfall in May: 247.7mm

The wettest month (with the highest rainfall) is September (334.3mm).
The driest month (with the least rainfall) is December (6.3mm).

Average rainfall days in May
Bangkok, Thailand

Average rainfall days in May - Bangkok, Thailand
  • Average rainfall days in May: 16 days

The month with the highest number of rainy days is September (21 days).
The months with the least rainy days are January and December (1 days).

Average sea temperature in May
Bangkok, Thailand

Average sea temperature in May - Bangkok, Thailand
  • Average sea temperature in May: 29.9°C

The best month for swimming (with the highest average sea temperature) is May (29.9°C).
The coldest month (with the lowest average sea temperature) is January (26.7°C).

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

Average daylight in May / Average sunshine in May - Bangkok, Thailand
  • Average daylight in May: 12h and 5min

The month with the longest days is June (Average daylight: 12h and 54min).
The month with the shortest days is December (Average daylight: 11h and 18min).

  • Average sunshine in May: 7h and 0min

The month with the most sunshine is February (Average sunshine: 9h and 0min).
The months with the least sunshine are August and September (Average sunshine: 5h and 12min).

Average UV index in May
Bangkok, Thailand

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

The months with the highest UV index are February, March, April, May, June, July, August and September (UV index 12).
The month with the lowest UV index is December (UV index 9).

Bangkok, Thailand

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