April weather forecast
Chiang Rai, Thailand

April brings an even hotter environment to Chiang Rai, with a considerable increase in rainfall compared to the previous months. The precipitation rate noted is significant at 98mm (3.86"). With an increased UV index, sun protection becomes a priority for anyone spending ample time outdoors. Even with these weather shifts, the exotic locale of Chiang Rai manages to enthral its visitors. A blend of sunny and rainy spells makes Chiang Rai unpredictable and appealing during April.

Temperature

April is the warmest month, with an average high-temperature of 34.8°C (94.6°F) and an average low-temperature of 20.6°C (69.1°F).

Heat index

April's average heat index is computed to be a blazing hot 47°C (116.6°F). Eyes open: Heat cramps and heat exhaustion are expected. Prolonged exertion could lead to heatstroke.
Given the heat index, its values are aligned with shaded sites and gentle winds. Uninterrupted exposure to the sun may boost the heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'felt air temperature', is a value derived by merging air temperature with the humidity to convey how the climate feels. This effect is personal, influenced by the individual's physical activity and heat sensitivity, shaped by factors including wind, attire, and metabolic variations. The sun, when shining directly, can have a significant impact on the perceived temperature, increasing the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly meaningful for babies and toddlers. Children often fail to understand the importance of rest and rehydration. Thirst is a late manifestation of dehydration - hence, it is crucial to stay hydrated, especially during ongoing physical activities.
Evaporating sweat, an outcome of perspiration, is key in assisting the human body to moderate its temperature. Under conditions of high temperature and humidity (enhanced heat index), sweat production is compromised, exacerbating the sensation of warmth. When the body is unable to balance heat gain, its temperature elevates, which may induce thermal illnesses.

Humidity

In April, the average relative humidity is 66%.

Rainfall

In Chiang Rai, during April, the rain falls for 10 days and regularly aggregates up to 98mm (3.86") of precipitation. Throughout the year, there are 137 rainfall days, and 1691mm (66.57") of precipitation is accumulated.

Daylight

In April, the average length of the day is 12h and 36min.
On the first day of April, sunrise is at 06:13 and sunset at 18:34. On the last day of the month, sunrise is at 05:51 and sunset at 18:43 +07.

Sunshine

The average sunshine in April is 8h.

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 the average person.
Note: An average UV index of 12 in April transforms into this advice:
Practice all-important precautions. Light skin people may get burned in less than 5 minutes. Limit direct sun exposure especially between 10 a.m. and 4 p.m., when UV radiation is at its peak. However, keep in mind that shade structures may not provide full sun protection. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades. Even on cloudy days, a sunscreen with a minimum 30 sun protection factor should be generously applied and frequently re-applied, including after every swim or outdoor exercise.