Waimalu
Hawaii, USA
Long-term weather forecast
Long-term weather forecast

April weather forecast and climate
Waimalu, HI

April, the same as March, is another warm spring month in Waimalu, Hawaii, with average temperature fluctuating between 76.8°F (24.9°C) and 70.7°F (21.5°C).

Temperature

In April, the average high-temperature is almost the same as in March - a still moderately hot 76.8°F (24.9°C). The average low-temperature, in Waimalu, is 70.7°F (21.5°C).

Humidity

Months with the lowest humidity are April through June and September, with an average relative humidity of 74%.

Rainfall

In April, in Waimalu, the rain falls for 18.6 days. Throughout April, 1.22" (31mm) of precipitation is accumulated. In Waimalu, during the entire year, the rain falls for 208.4 days and collects up to 16.5" (419mm) of precipitation.

Ocean temperature

January through April, with an average ocean temperature of 75.2°F (24°C), are months with the coldest seawater in Waimalu.
Note: For individuals prone to feeling cold, swimming in 73.4°F (23°C) is still regarded as intolerable. A wetsuit is not a necessity, but sunshine, wind, and air temperature are essential factors for relishing swimming at 75.2°F (24°C).

Daylight

In Waimalu, the average length of the day is 12.7h.

Sunshine

The average sunshine in April is 7.8h.

UV index

Months with the lowest UV index are January through August, October through December, with an average maximum UV index of 6. A UV Index of 6 to 7 symbolizes a high health hazard from the exposure to the Sun's UV rays for the average person.
Note: In April, the average maximum UV index of 6 translate into the following recommendations:
Take precautions against overexposure. Protection against sun damage is needed. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.

What is the temperature in April in Waimalu?

In April, the average high-temperature is 76.8°F (24.9°C), and the average low-temperature is 70.7°F (21.5°C).

What is the least humid month in Waimalu?

April through June and September, with an average relative humidity of 74%, are the least humid months in Waimalu, Hawaii.

What is the average humidity in April in Waimalu?

In April, the average relative humidity is 74%.

How many days does it rain in April in Waimalu?

In Waimalu, Hawaii, in April, during 18.6 rainfall days, 1.22" (31mm) of precipitation is typically accumulated.

What are the months with the coldest ocean in Waimalu?

Through and April, with an average ocean temperature of 75.2°F (24°C).

How warm is the water in April in Waimalu?

In Waimalu, the average seawater temperature in April is 75.2°F (24°C). A person's cold intolerance, with sunshine, wind, and air temperature, are essential factors for enjoying swimming in 75.2°F (24°C) water.

What is the average length of the day in April in Waimalu?

The average length of the day in April in Waimalu is 12.7h.

How many hours of sunshine does Waimalu have in April?

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

When is the lowest UV index in Waimalu?

Months with the lowest UV index in Waimalu, Hawaii, are January through August, October through December, with an average maximum UV index of 6.

What is the UV index reading in April in Waimalu?

In April, the average daily maximum UV index in Waimalu is 6. A UV Index reading of 6 to 7 represents a high health risk from unsafe exposure to the Sun's UV rays.
Average temperature in April - Waimalu, HI
  • Average high temperature in April: 76.8°F

The warmest months (with the highest average high temperature) are August and September (82°F).
Months with the lowest average high temperature are February and March (75.4°F).

  • Average low temperature in April: 70.7°F

The month with the highest average low temperature is September (75°F).
The coldest month (with the lowest average low temperature) is February (68°F).

Average humidity in April - Waimalu, HI
  • Average humidity in April: 74%

Months with the highest relative humidity are February and December (76%).
Months with the lowest relative humidity are April, May, June and September (74%).

Average rainfall in April - Waimalu, HI
  • Average rainfall in April: 1.22"

The wettest month (with the highest rainfall) is October (2.09").
The driest month (with the least rainfall) is July (0.71").

Average rainfall days in April - Waimalu, HI
  • Average rainfall days in April: 18.6 days

The month with the highest number of rainy days is March (20 days).
The month with the least rainy days is January (13.5 days).

Average sea temperature in April - Waimalu, HI
  • Average sea temperature in April: 75°F

The best months for swimming (with the highest average sea temperature) are August, September and October (81°F).
The coldest months (with the lowest average sea temperature) are January, February, March and April (75°F).

Average daylight in April / Average sunshine in April - Waimalu, HI
  • Average daylight in April: 12.7h

The month with the longest days is June (Average daylight: 13.4h).
The month with the shortest days is December (Average daylight: 10.8h).

  • Average sunshine in April: 7.8h

The month with the most sunshine is June (Average sunshine: 9.9h).
Months with the least sunshine are November and December (Average sunshine: 6.3).

Average UV index in April - Waimalu, HI
  • Average UV index in April: 6

The month with the highest UV index is September (UV index 7).
Months with the lowest UV index are January, February, March, April, May, June, July, August, October, November and December (UV index 6).