April weather forecast
Haikou, China

April showcases a substantial leap forward into summer from March, providing the first taste of peaking temperatures around 29.7°C (85.5°F). The city's tropical climate blossoms, and rainfall becomes more frequent and heavier, surpassing the previous months' readings by a notable margin. These changes invite vibrant greenery across Haikou, making it the perfect time for flora enthusiasts to observe the city's tropical plant life in all its glory.

Temperature

The coming of April brings a minor shift in Haikou's weather, with average high-temperatures adjusting from March's moderately hot 26°C (78.8°F) to a still warm 29.7°C (85.5°F). Haikou, in the month of April, anticipates a consistent average low-temperature of 22.4°C (72.3°F).

Heat index

April's average heat index is calculated to be a very hot 38°C (100.4°F). Incorporate special precautions, risk of heat exhaustion and heat cramps is substantial. Sustained activity could cause heatstroke.
In the scope of the heat index, its values resonate with shade and light wind conditions. The heat index might be elevated by 15 Fahrenheit (8 Celsius) degrees due to direct sun exposure.
Note: The heat index, also known as 'felt air temperature' or 'feels like', joins air temperature with relative humidity to produce a temperature perception for humans. Elements such as metabolic variations, pregnancy, and physical exertion can influence one's weather perception. When exposed to direct sunlight, it's possible for the heat index to increase by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely vital to babies and toddlers. Young individuals usually face more risks than adults due to their lower sweat production. Their large skin surface area relative to their tiny bodies and high heat production from their activities adds to their risk.
To prevent overheating and help regulate its internal temperature, the human body sweat and rely on the evaporation to cool down. Elevated relative humidity diminishes evaporation, thereby reducing the body's ability to shed heat and creating a feeling of being too warm. If the body retains more heat than it can expel, the increasing temperature can lead to heat-related conditions.

Humidity

In April, the average relative humidity is 85%.

Rainfall

In Haikou, in April, it is raining for 11.5 days, with typically 100mm (3.94") of accumulated precipitation. In Haikou, during the entire year, the rain falls for 145 days and collects up to 1652mm (65.04") of precipitation.

Sea temperature

In Haikou, the average seawater temperature in April is 23.2°C (73.8°F).
Note: A person's cold intolerance, with sunshine, wind, and air temperature, are essential factors for enjoying swimming in 23.2°C (73.8°F) water. (FYI: The Olympic swimming competition requires a water temperature between 25°C (77°F) and 28°C (82.4°F).)

Daylight

In April, the average length of the day in Haikou, China, is 12h and 37min.
On the first day of the month, sunrise is at 06:32 and sunset at 18:53. On the last day of April, in Haikou, sunrise is at 06:10 and sunset at 19:02 CST.

Sunshine

In Haikou, the average sunshine in April is 5.6h.

UV index

March through September, with an average maximum UV index of 12, are months with the highest UV index in Haikou. A UV Index estimate of 11, and higher, represents an ultimate health vulnerability from exposure to the Sun's UV radiation for average individuals.
Note: An average UV index of 12 in April transforms into this advice:
Enforce every key safety measure. Those with light skin might get burns in a matter of minutes. Try to minimize direct Sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation. Also note that objects like parasols or canopies might not provide complete sun protection. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Despite the cloud cover, sunscreen with an SPF of at least 30 should be generously applied and reapplied, particularly after a swim or an outdoor workout. Caution! Sand and water surfaces escalate the UV intensity from the Sun.