April weather forecastSiantan, Indonesia

April

Weather in April

April, the same as March, in Siantan, Indonesia, is a hot spring month, with an average temperature ranging between max 31.8°C (89.2°F) and min 23.9°C (75°F).

Temperature

The transition from March to April brings an average high-temperature of a still hot 31.8°C (89.2°F), barely different from March's 31.4°C (88.5°F). In the month of April, an average of 23.9°C (75°F) marks the low-temperature.

Heat index

Throughout April, the heat index is calculated to be a blazing hot 45°C (113°F). Take caution: Heat exhaustion and heat cramps are probable. Heatstroke may be imminent with ongoing effort.
The metrics for the heat index are tailored for both shady environments and light winds. Heat index values may be hiked up by 15 Fahrenheit (8 Celsius) degrees under direct sunshine.
Note: The heat index, also known as 'feels like' or 'real feel', reflects the blend of air temperature and relative humidity to give a temperature impression. One's perception of weather can be shaped by other factors, involving metabolic differences, pregnancy, and physical exertion. With direct sunlight, be aware that it might enhance the heat sensation, raising the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to children. Youngsters are usually more at risk than adults, considering they sweat less. Additionally, their high skin surface area compared to their little bodies and their high heat production due to activity increases their risk.
Normally, the human body cools itself through perspiration, which removes excessive heat by evaporating sweat. Under high air temperature coupled with high humidity (high heat index), the body's perspiration is reduced, intensifying the sensation of heat. When body temperature rises due to an imbalance in heat gain, there's a potential for dehydration and overheating.

Humidity

In April, the average relative humidity is 84%.

Rainfall

In April, the rain falls for 26.6 days. Throughout April, 146mm (5.75") of precipitation is accumulated. In Siantan, Indonesia, during the entire year, the rain falls for 282.2 days and collects up to 1495mm (58.86") of precipitation.

Daylight

In Siantan, the average length of the day in April is 12h and 7min.
On the first day of the month, sunrise is at 05:43 and sunset at 17:50. On the last day of April, sunrise is at 05:36 and sunset at 17:43 WIB.

Sunshine

In Siantan, the average sunshine in April is 7.8h.

UV index

The months with the highest UV index in Siantan are January through December, with an average maximum UV index of 7. The months with the lowest UV index are January through December, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high threat to health from unprotected exposure to Sun's UV rays for the ordinary person.
Note: In April, the maximum UV index of 7 suggests this advice:
Take precautions against overexposure. Protection against sun damage is needed. During the period from 10 a.m. to 4 p.m., UV radiation is highest. Try to avoid direct sunlight during these hours. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation.

Updated: Aug 25, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

In April, in Siantan, the average high-temperature is 31.8°C (89.2°F), and the average low-temperature is 23.9°C (75°F). In April, the average heat index (a.k.a. 'feels like', 'real feel'), which combines relative humidity and air temperature, is calculated to be 45°C (113°F).

In April, the average relative humidity is 84%.

In Siantan, in April, it is raining for 26.6 days, with typically 146mm (5.75") of accumulated precipitation.

In Siantan, the average day length in April is 12h and 7min.

On the first day of April, sunrise is at 05:43 and sunset at 17:50. On the last day of the month, sunrise is at 05:36 and sunset at 17:43 WIB.

The average sunshine duration in April is 7.8h.

January through December, with an average maximum UV index of 7, are months with the highest UV index in Siantan.

January through December, with an average maximum UV index of 7, are months with the lowest UV index.

In Siantan, the average daily maximum UV index in April is 7. A UV Index of 6 to 7 symbolizes a high health threat from exposure to the Sun's UV radiation.

Today

Tomorrow

Long-term

Year J F M April M J J A S O N D

Mar

April

May

Average high temperature

31.4°C

31.8°C

32.3°C

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

5.6km/h

5km/h

5.1km/h

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average daylight

Average sunshine

Average sunshine days

3.7

2.3

3.5

Average UV index

Average cloud cover

Average visibility

Average temperature in April
Siantan, Indonesia

Average high temperature in April: 31.8°C

The warmest month (with the highest average high temperature) is August (32.5°C).
The month with the lowest average high temperature is January (30.6°C).

Average low temperature in April: 23.9°C

The months with the highest average low temperature are May and October (24.3°C).
The coldest month (with the lowest average low temperature) is February (23.3°C).

Average pressure in April
Siantan, Indonesia

Average pressure in April: 1009.4mbar

The months with the highest atmospheric pressure are February and March (1009.9mbar).
The month with the lowest atmospheric pressure is November (1008.9mbar).

Average wind speed in April
Siantan, Indonesia

Average wind speed in April: 4.4km/h

The windiest month (with the highest average wind speed) is January (6.3km/h).
The calmest month (with the lowest average wind speed) is April (4.4km/h).

Average humidity in April
Siantan, Indonesia

Average humidity in April: 84%

The month with the highest relative humidity is February (85%).
The month with the lowest relative humidity is September (79%).

Average rainfall in April
Siantan, Indonesia

Average rainfall in April: 146mm

The wettest month (with the highest rainfall) is February (161mm).
The driest month (with the least rainfall) is August (74mm).

Average rainfall days in April
Siantan, Indonesia

Average rainfall days in April: 26.6 days

The month with the highest number of rainy days is April (26.6 days).
The month with the least rainy days is July (18.7 days).

Average daylight in April /
Average sunshine in April
Siantan, Indonesia

Average daylight in April: 12h and 6min

The month with the longest days is June (Average daylight: 12h and 6min).
The month with the shortest days is October (Average daylight: 12h and 6min).

Average sunshine in April: 7h and 48min

The month with the most sunshine is September (Average sunshine: 8h and 36min).
The month with the least sunshine is December (Average sunshine: 7h and 0min).

Average sunshine days in April
Siantan, Indonesia

Average sunshine days in April: 2.3 days

The months with the most sunshine days are July and August (10.2 days).
The month with the least sunshine days is April (2.3 days).

Average UV index in April
Siantan, Indonesia

Average UV index in April: 7

The months with the highest UV index are January, February, March, April, May, June, July, August, September, October, November and December (UV index 7).
The months with the lowest UV index are January, February, March, April, May, June, July, August, September, October, November and December (UV index 7).

Average cloud cover in April
Siantan, Indonesia

Average cloud cover in April: 46

The month with the most cloud cover is December (Cloud cover 52).
The months with the least cloud cover are August and September (Cloud cover 37).

Average visibility in April
Siantan, Indonesia

Average visibility in April: 8km

The months with the highest visibility are May, June, July, August, September, October and November (9km).
The months with the lowest visibility are January, February, March, April and December (8km).