May weather forecast and climate
Chiang Rai, Thailand

The White Temple of Wat Rong Khun with a waterfront fishpond in Chiang Rai, Thailand
The White Temple of Wat Rong Khun with a waterfront fishpond in Chiang Rai, Thailand

Weather in May

May, the last month of the spring, in Chiang Rai, is another hot month, with average temperature fluctuating between 22.5°C (72.5°F) and 33.1°C (91.6°F).

Temperature

In Chiang Rai, the average high-temperature is almost the same as in April - a still hot 33.1°C (91.6°F). In May, in Chiang Rai, the average low-temperature is 22.5°C (72.5°F).

Heat index

The average heat index is estimated at a burning hot 46.6°C (115.9°F). Beware - heat cramps and heat exhaustion are very likely. Heatstroke is imminent with prolonged activity.
Take into consideration that the heat index values are calculated for shade and light wind conditions. With the exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like', 'felt air temperature', 'apparent temperature', or 'real feel', is a measure of how hot it feels when the actual air humidity is factored in. Additional factors like activity, differences in body mass, height, and shape, wind, and metabolic differences affect individual temperature impact. Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.
Perspiration is the human body's physiological response to high temperatures and is an attempt to lower body temperature through evaporation of sweat. A higher relative humidity affects normal body cooling by reducing the evaporation rate, subsequently lowering the rate at which the body cools and increasing the perception of heat. When heat gain surpasses the level the body can shed, body temperature begins to increase, and consequently, overheating and dehydration can occur, with varying severity.

Humidity

In Chiang Rai, Thailand, the average relative humidity in May is 76%.

Rainfall

In Chiang Rai, Thailand, during May, the rain falls for 17 days and regularly aggregates up to 213.4mm (8.4") of precipitation. Throughout the year, there are 137 rainfall days, and 1690.5mm (66.56") of precipitation is accumulated.

Daylight

In May, the average length of the day in Chiang Rai is 13.1h.

Sunshine

The average sunshine in Chiang Rai is 7h.

UV index

Months with the highest UV index are March through September, with an average maximum UV index of 12. A UV Index estimate of 11, and higher, represents an extreme threat to health from unsafe exposure to the UV radiation for average individuals.
Note: The average daily UV index of 12 in May transform into the following instructions:
Take all required precautions, as unprotected skin and eyes can burn in minutes. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. A broad-spectrum sunscreen of SPF 30+ should be liberally applied and re-applied every two hours, and immediately after an outdoor workout or a swim.
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FAQ

What is the temperature in May in Chiang Rai?

In Chiang Rai, in May, the average high-temperature is 33.1°C (91.6°F), and the average low-temperature is 22.5°C (72.5°F). In May, the average heat index (a.k.a. 'real feel', 'apparent temperature'), that represents influence of the relative humidity to air temperaure, is calculated to 46.6°C (115.9°F).

What is the average humidity in May in Chiang Rai?

The average relative humidity in May in Chiang Rai is 76%.

How many days does it rain in May in Chiang Rai?

In May, in Chiang Rai, Thailand, the rain falls for 17 days. Throughout May, 213.4mm (8.4") of precipitation is accumulated.

How many hours of daylight does Chiang Rai have in May?

In May, the average length of the day in Chiang Rai is 13.1h.

How many hours of sunshine does Chiang Rai have in May?

In Chiang Rai, the average sunshine in May is 7h.

What is the month with the highest UV index in Chiang Rai?

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

What is the UV index intensity in May in Chiang Rai?

In May, the average daily maximum UV index in Chiang Rai is 12. A UV Index reading of 11, and higher, represents an excessive health risk from the exposure to the Sun's UV radiation.

Average temperature in May
Chiang Rai, Thailand

Average temperature in May - Chiang Rai, Thailand
  • Average high temperature in May: 33.1°C

The warmest month (with the highest average high temperature) is April (34.8°C).
The month with the lowest average high temperature is December (27.2°C).

  • Average low temperature in May: 22.5°C

The month with the highest average low temperature is June (23.6°C).
The coldest month (with the lowest average low temperature) is January (12.8°C).

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Average humidity in May
Chiang Rai, Thailand

Average humidity in May - Chiang Rai, Thailand
  • Average humidity in May: 76%

The month with the highest relative humidity is August (84%).
The month with the lowest relative humidity is March (62%).

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Average rainfall in May
Chiang Rai, Thailand

Average rainfall in May - Chiang Rai, Thailand
  • Average rainfall in May: 213.4mm

The wettest month (with the highest rainfall) is August (358.4mm).
The driest month (with the least rainfall) is January (7.5mm).

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Average rainfall days in May
Chiang Rai, Thailand

Average rainfall days in May - Chiang Rai, Thailand
  • Average rainfall days in May: 17 days

The month with the highest number of rainy days is August (24 days).
The month with the least rainy days is February (1 days).

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Average daylight in May /
Average sunshine in May
Chiang Rai, Thailand

Average daylight in May / Average sunshine in May - Chiang Rai, Thailand
  • Average daylight in May: 13.1h

The month with the longest days is June (Average daylight: 13.3h).
The month with the shortest days is December (Average daylight: 10.9h).

  • Average sunshine in May: 7h

The month with the most sunshine is February (Average sunshine: 9h).
Months with the least sunshine are June, July and August (Average sunshine: 5).

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Average UV index in May
Chiang Rai, Thailand

Average UV index in May - Chiang Rai, Thailand
  • Average UV index in May: 12

Months with the highest UV index are March, April, May, June, July, August and September (UV index 12).
The month with the lowest UV index is December (UV index 7).

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