May weather forecast
Hua Hin, Thailand

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Scenic blue sky, clear water, and rocks on the white sandy beach of Sainoi in Hua Hin, Thailand
Scenic blue sky, clear water, and rocks on the white sandy beach of Sainoi in Hua Hin, Thailand

Weather in May

In May, weather conditions in Hua Hin begin to shift significantly. The most glaring change is the near doubling of rainfall from April to a high of 109mm (4.29"). The high temperature remains constant while the relative humidity sees a minimal increase. May provides ample daylight, allowing residents and tourists to maximize their day despite the frequent showers. The end of the month starts to hint at the peak of the rainy season, signaled by increased rainfall.

Temperature

April and May, when the average high-temperature reaches 33.6°C (92.5°F), are the warmest months.

Heat index

For May, the heat index is computed to be a life-threatening hot 47°C (116.6°F). Keep on guard: Heat exhaustion and heat cramps are probable. Heatstroke is a possible danger with ongoing physical activity.
Note that heat index values are valued for light wind and location in the shade. The heat index has the potential to rise by 15 Fahrenheit (8 Celsius) degrees with direct sunshine exposure.
Note: The heat index, also known as 'feels like' or 'felt air temperature', reflects the blend of air temperature and relative humidity to give a temperature impression. An individual's perception of weather can be affected by a variety of elements including metabolic differences, being pregnant, and their level of physical exertion. It is essential to be conscious of the fact that direct sunlight can intensify the felt heat, leading to an elevation in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially vital to children. Young ones often disregard the necessity to rest and hydrate. Thirst usually indicates advanced dehydration - hence, it is key to stay hydrated, particularly during ongoing physical activities.
The natural cooling mechanism in humans involves perspiration, where the evaporation of sweat balances out excessive warmth. When the level of relative humidity is elevated, evaporation diminishes, causing more warmth to be retained in the body than in dry air. Overheating can ensue when the body accumulates more heat than it can release, and dehydration severity may vary.

Humidity

In Hua Hin, the average relative humidity in May is 74%.

Rainfall

In Hua Hin, in May, it is raining for 13 days, with typically 109mm (4.29") of accumulated precipitation. Throughout the year, in Hua Hin, there are 118 rainfall days, and 955mm (37.6") of precipitation is accumulated.

Sea temperature

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

Daylight

The average length of the day in May in Hua Hin is 12h and 43min.
On the first day of the month, sunrise is at 05:59 and sunset at 18:34. On the last day of May, in Hua Hin, sunrise is at 05:53 and sunset at 18:42 +07.

Sunshine

In May, the average sunshine in Hua Hin, Thailand, is 7h.

UV index

The months with the highest UV index in Hua Hin are February through October, with an average maximum UV index of 12. A UV Index reading of 11, and higher, represents an extreme threat to health from unsafe exposure to UV radiation for average individuals.
Note: The maximum UV index of 12 during May leads to these instructions:
Utilize all necessary safety measures, unprotected skin could suffer burns instantly. From 10 a.m. to 4 p.m., when UV radiation is at its strongest, limit direct exposure to the Sun and note that shade structures may not provide full sun protection. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days. Apply and frequently reapply a minimum SPF 30 sunscreen even on cloudy days, especially after swimming or an outdoor workout. Stay vigilant! UV rays get a boost in intensity due to sand and water reflections.

Frequently asked questions

What time of the year is the hottest in Hua Hin?

April and May are the warmest months in Hua Hin, Thailand, with an average high-temperature of 33.6°C (92.5°F).

How hot is it in Hua Hin in May?

During May, Hua Hin experiences an average high-temperature of 33.6°C (92.5°F) and a low-temperature of 26°C (78.8°F). In May, the average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which represents the influence of relative humidity on air temperature, is computed to be 47°C (116.6°F).

What is the average humidity in May in Hua Hin?

The average relative humidity in May is 74%.

How much does it rain in Hua Hin in May?

In Hua Hin, in May, it is raining for 13 days, with typically 109mm (4.29") of accumulated precipitation.

What months are the sea warmest in Hua Hin?

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

What is the sea water temperature in May in Hua Hin?

In May, the average sea temperature in Hua Hin is 30°C (86°F). The water temperature above 30°C (86°F) is arguably regarded as unpleasant. The primary purpose of entering the water - cooling down from sunshine and high temperatures - is lost.

What is the average length of the day in May in Hua Hin?

In Hua Hin, the average day length in May is 12h and 43min.

What time are sunrise and sunset in May in Hua Hin?

On the first day of May, sunrise is at 05:59 and sunset at 18:34. On the last day of the month, sunrise is at 05:53 and sunset at 18:42 +07.

How many hours of sunshine does Hua Hin have in May?

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

What are the months with the highest UV index in Hua Hin?

February through October, with an average maximum UV index of 12, are months with the highest UV index in Hua Hin.

What is the UV index intensity in May in Hua Hin?

In May, the average daily maximum UV index in Hua Hin is 12. A UV Index estimate of 11, and higher, represents an ultimate hazard to health from 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
Hua Hin, Thailand

Average temperature in May - Hua Hin, Thailand
  • Average high temperature in May: 33.6°C

The warmest months (with the highest average high temperature) are April and May (33.6°C).
The month with the lowest average high temperature is December (29.5°C).

  • Average low temperature in May: 26°C

The month with the highest average low temperature is May (26°C).
The coldest month (with the lowest average low temperature) is January (22.2°C).

Average humidity in May
Hua Hin, Thailand

Average humidity in May - Hua Hin, Thailand
  • Average humidity in May: 74%

The month with the highest relative humidity is October (80%).
The month with the lowest relative humidity is December (67%).

Average rainfall in May
Hua Hin, Thailand

Average rainfall in May - Hua Hin, Thailand
  • Average rainfall in May: 108.9mm

The wettest month (with the highest rainfall) is October (246.2mm).
The driest month (with the least rainfall) is December (7.9mm).

Average rainfall days in May
Hua Hin, Thailand

Average rainfall days in May - Hua Hin, Thailand
  • Average rainfall days in May: 13 days

The month with the highest number of rainy days is August (18 days).
The months with the least rainy days are January, February, March and December (2 days).

Average sea temperature in May
Hua Hin, Thailand

Average sea temperature in May - Hua Hin, 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
Hua Hin, Thailand

Average daylight in May / Average sunshine in May - Hua Hin, Thailand
  • Average daylight in May: 12h and 4min

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 24min).

  • Average sunshine in May: 7h

The months with the most sunshine are January, February, March and December (Average sunshine: 9h).
The months with the least sunshine are June, July, August and September (Average sunshine: 5h).

Average UV index in May
Hua Hin, Thailand

Average UV index in May - Hua Hin, 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 9).

Hua Hin, Thailand

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