April weather forecast
Chiang Mai, Thailand

April holds the reputation of being the hottest month of the year in Chiang Mai. The temperature peaks, reaching an average high of 36.5°C (97.7°F). Consistent length of daylight hours and an increase in relative humidity from March to 57% create a markedly balmy climate. Despite these heat-intensive conditions, rainfall is scant but significantly more than in the preceding months. Visitors can anticipate an intensely tropical weather during their April sojourn in Chiang Mai.

Temperature

April stands out as Chiang Mai's warmest month, with an average high-temperature of 36.5°C (97.7°F) and a low-temperature of 22.9°C (73.2°F).

Heat index

April's average heat index is evaluated at a burning hot 48°C (118.4°F). Warning: Heat cramps and heat exhaustion are anticipated. Heatstroke is a risk with ongoing activity.
When referencing the heat index, its values are suitable for shady environments and light breezes. A rise in the heat index by 15 Fahrenheit (8 Celsius) degrees may result from direct sunlight exposure.
Note: The heat index, also known as 'real feel' or 'feels like', quantifies the warmth felt when relative humidity is considered. Factors such as metabolic variation, pregnancy, and physical activity play a role in one's impression of weather. Recognize that direct exposure to the sun can escalate the heat effect, potentially adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are extremely significant for children. Young ones regularly neglect the requirement for rest and fluid replenishment. Thirst is a late stage of dehydration - so, it is necessary to keep hydrated, particularly during extended periods of physical exertion.
The process of perspiration is vital for the human body to get rid of excess warmth by allowing sweat to evaporate. In the presence of high relative humidity, the evaporation rate diminishes, resulting in the body retaining more warmth compared to dry conditions. Accumulating more heat than the body can dissipate leads to an uptick in body temperature, with potential heat stress consequences.

Humidity

In Chiang Mai, the average relative humidity in April is 57%.

Rainfall

In Chiang Mai, in April, it is raining for 6 days, with typically 57mm (2.24") of accumulated precipitation. Throughout the year, in Chiang Mai, there are 113 rainfall days, and 1131mm (44.53") of precipitation is accumulated.

Daylight

The average length of the day in April is 12h and 34min.
On the first day of the month, sunrise is at 06:17 and sunset at 18:37. On the last day of April, sunrise is at 05:56 and sunset at 18:45 +07.

Sunshine

In Chiang Mai, the average sunshine in April is 8.6h.

UV index

March through September, with an average maximum UV index of 12, are months with the highest UV index. A UV Index reading of 11, and higher, represents an extreme health hazard from unsafe exposure to UV radiation for ordinary individuals.
Note: The maximum UV index of 12 during April translates into these guidelines:
Take every vital safeguard, as unprotected skin and eyes may suffer burns rapidly. During the period from 10 a.m. to 4 p.m., UV radiation is highest. Try to avoid direct sunlight during these hours. Experience reduced UV exposure by about half when donning a wide-brim hat. Regularly apply and reapply a broad-spectrum sunscreen with a minimum SPF 30 every two hours, or straight after swimming or an outdoor activity.