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 begins with an average high-temperature of a hot 34.4°C (93.9°F), reflecting close similarity to the preceding month. Bangkok observes an average low-temperature of 26.3°C (79.3°F) during May nights.

Heat index

May's heat index is estimated at a blazing hot 51°C (123.8°F). Take caution: Heat exhaustion and heat cramps are probable. Heatstroke may be imminent with ongoing effort.
Understanding the heat index involves considering values for shaded locales with light wind. In the presence of direct sunshine, the heat index could be augmented by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'real feel', marries air temperature and humidity to produce a value illustrating perceived warmth. The effect is personal, with varied weather perceptions among individuals due to differences in body mass, stature, and physical activity. It is essential to realize that direct sunlight can escalate the perceived temperature, increasing the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values remain especially vital for babies and toddlers. Youngsters generally face more threats than adults given their lesser ability to sweat. Coupled with their larger skin surface relative to their small bodies and higher heat production due to their activities, they are more endangered.
Perspiration is essential for the human body; it facilitates cooling through the process of sweat evaporation. In circumstances of high air temperature and humidity (high heat index), the body's perspiration is restricted, heightening the feeling of warmth. Potential thermal conditions emerge as the body's heat gain outpaces its cooling mechanisms.

Humidity

The average relative humidity in May is 75%.

Rainfall

In Bangkok, Thailand, in May, it is raining for 16 days, with typically 248mm (9.76") of accumulated precipitation. In Bangkok, during the entire year, the rain falls for 128 days and collects up to 1648mm (64.88") of precipitation.

Sea temperature

May is the month with the warmest seawater, with an average sea temperature of 29.9°C (85.8°F).
Note: For any water activity, the surface water temperatures in the range of 25°C (77°F) to 29°C (84.2°F) are deemed excellent and incredibly pleasant for longer durations.

Daylight

In May, the average length of the day 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 reading of 11, and higher, represents an excessive health risk from unsafe exposure to UV radiation for the ordinary person.
Note: A maximum high UV index of 12 in May translates into the following recommendations:
Ensure every crucial precaution is taken. Individuals with light skin could experience burns in under 5 minutes. The Sun's UV radiation is most intense from 10 a.m. to 4 p.m. Try to avoid direct sun exposure during these hours. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key. Frequent reapplication of a broad-spectrum SPF 30+ sunscreen is vital every two hours or directly after a swim or an outdoor workout. Watch out! Sand and water enhance the UV exposure you receive.

Frequently asked questions

How hot does it get in May?

Bangkok in May has an average high-temperature of 34.4°C (93.9°F) and an average low-temperature of 26.3°C (79.3°F). The average heat index (a.k.a. 'apparent temperature', 'real feel'), which takes the relative humidity and factors it into the air temperature reading, in May is estimated at 51°C (123.8°F).

What is the average humidity in May?

The average relative humidity in May is 75%.

How many days does it rain in May?

In Bangkok, in May, it is raining for 16 days, with typically 248mm (9.76") of accumulated precipitation.

When is the sea warmest in Bangkok?

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

What is the water temperature in May?

In Bangkok, in May, the average water 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?

In May, the average day length is 12h and 46min.

What time are sunrise and sunset in May in Bangkok?

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.

How many hours of sunshine does Bangkok have in May?

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

When is the highest UV index?

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

What is the UV index intensity 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 the Sun's UV radiation.
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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