May weather forecast
Chiang Rai, Thailand

The charm of Chiang Rai in May lies in its mixed-interlude of sunshine and rainfall. The city experiences its hottest month, welcoming frequent downpours, marking a transition into the rainy season. These intermittent showers are a refreshing contrast to the high humidity levels. Though sunlight is slightly less in comparison to previous months, it perfectly blends with showers, painting a vibrant picture of the city. May is a time when nature flourishes and the city’s greenery is at its peak.

Temperature

Chiang Rai records an average high-temperature of a still tropical 33.1°C (91.6°F) in May, closely mirroring the climate of the previous month. Throughout May, the average low-temperature dips to an agreeable 22.5°C (72.5°F).

Heat index

May's mean heat index is computed to be a burning hot 47°C (116.6°F). Note: Heat exhaustion and heat cramps are probable. Heatstroke can follow with prolonged activity.
In terms of the heat index, values are set with light wind and shade conditions in mind. Direct sunlight exposure may cause a 15 Fahrenheit (8 Celsius) degrees rise in the heat index.
Note: The heat index, also known as 'feels like' or 'apparent temperature', quantifies the warmth felt when relative humidity is considered. Metabolic differences, pregnancy status, and the level of physical activity are additional factors influencing an individual's weather perception. One should be aware that direct sunshine can amplify the perceived temperature, raising the heat index by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to babies and toddlers. Children regularly disregard the necessity to rest and replenish fluids. Thirst is a late symptom of dehydration - thus, maintaining hydration, particularly during long-lasting physical activities, is essential.
Perspiration and the resultant sweat evaporation are the body's natural thermostat, helping regulate temperature. 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. Should the body fail to balance its heat gain, the escalating temperature poses health challenges.

Humidity

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

Rainfall

In Chiang Rai, during May, the rain falls for 17 days and regularly aggregates up to 213mm (8.39") of precipitation. Throughout the year, there are 137 rainfall days, and 1691mm (66.57") of precipitation is accumulated.

Daylight

The average length of the day in May is 13h and 5min.
On the first day of May, sunrise is at 05:51 and sunset at 18:44. On the last day of the month, sunrise is at 05:40 and sunset at 18:55 +07.

Sunshine

In May, the average sunshine is 7h.

UV index

The months with the highest UV index are March through September, with an average maximum UV index of 12. A UV Index value of 11, and more, symbolizes an extreme threat to health from exposure to the Sun's UV radiation for average individuals.
Note: A daily maximum UV index of 12 in May translates into the following instructions:
Put into action all crucial precautions. Defense against sun damage is a must. UV radiation from the sun is at its strongest between 10 a.m. and 4 p.m. Try to limit direct exposure during these hours. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance. A broad-spectrum sunscreen of SPF 30+ should be used liberally and reapplied every two hours or post an outdoor workout or swim.