April weather forecast
Honolulu, HI

Waikiki beach with clear calm waters on the foot of Honolulu city, Hawaii, with the vast cityscape and mountains in the distance
Waikiki beach with clear calm waters on the foot of Honolulu city, Hawaii, with the vast cityscape and mountains in the distance

Weather in April

April, the same as March, is a moderately hot spring month in Honolulu, Hawaii, with average temperature ranging between min 71.4°F (21.9°C) and max 76.6°F (24.8°C).

Temperature

In April, the average high-temperature is relatively the same as in March - a still warm 76.6°F (24.8°C). The average low-temperature, in April, is 71.4°F (21.9°C).

Humidity

Months with the lowest humidity in Honolulu are April, May, September and November, with an average relative humidity of 74%.

Rainfall

In April, the rain falls for 17.3 days. Throughout April, 1.02" (26mm) of precipitation is accumulated. Throughout the year, in Honolulu, Hawaii, there are 197.2 rainfall days, and 14.61" (371mm) of precipitation is accumulated.

Ocean temperature

In Honolulu, Hawaii, the average seawater temperature is 76.8°F (24.9°C).
Note: Depending on a person's sensitivity to cold, with regards to sunshine, wind, and air temperature, a quick swim in 76.8°F (24.9°C) water may be enjoyable. (FYI: The official water temperature required for the Olympic swimming competition is 77°F (25°C) to 82.4°F (28°C).)

Daylight

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

Sunshine

The average sunshine in April is 8.3h.

UV index

Months with the lowest UV index are January through June, October through December, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high health hazard from the exposure to the Sun's UV rays for ordinary individuals.
Note: The average daily UV index of 6 transform into the following instructions:
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.
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FAQ

What are the least humid months in Honolulu?

April, May, September and November, with an average relative humidity of 74%, are the least humid months.

What is the average humidity in April in Honolulu?

In April, the average relative humidity in Honolulu is 74%.

How many days does it rain in April in Honolulu?

In Honolulu, Hawaii, in April, during 17.3 rainfall days, 1.02" (26mm) of precipitation is typically accumulated.

What is the water temperature in April in Honolulu?

In Honolulu, in April, the average water temperature is 76.8°F (24.9°C). A person's cold intolerance, with sunshine, wind, and air temperature, are essential factors for enjoying swimming in 76.8°F (24.9°C) water.

How many hours of daylight does Honolulu have in April?

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

How many hours of sunshine does Honolulu have in April?

In Honolulu, the average sunshine in April is 8.3h.

When is the lowest UV index in Honolulu?

January through June, October through December, with an average maximum UV index of 6, are months with the lowest UV index.

What is the UV index reading in April in Honolulu?

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

Average temperature in April
Honolulu, HI

Average temperature in April - Honolulu, HI
  • Average high temperature in April: 76.6°F

The warmest month (with the highest average high temperature) is September (81.5°F).
Months with the lowest average high temperature are February and March (75°F).

  • Average low temperature in April: 71.4°F

The month with the highest average low temperature is August (75.7°F).
The coldest month (with the lowest average low temperature) is February (69.1°F).

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Average pressure in April
Honolulu, HI

Average pressure in April - Honolulu, HI
  • Average pressure in April: 30.06"

The month with the highest atmospheric pressure is April (30.06").
Months with the lowest atmospheric pressure are September and October (29.97").

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Average wind speed in April
Honolulu, HI

Average wind speed in April - Honolulu, HI
  • Average wind speed in April: 11mph

The windiest month (with the highest average wind speed) is July (12.1mph).
The calmest month (with the lowest average wind speed) is January (9mph).

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Average humidity in April
Honolulu, HI

Average humidity in April - Honolulu, 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, September and November (74%).

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Average rainfall in April
Honolulu, HI

Average rainfall in April - Honolulu, HI
  • Average rainfall in April: 1.02"

The wettest months (with the highest rainfall) are March and October (1.81").
The driest month (with the least rainfall) is July (0.67").

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Average rainfall days in April
Honolulu, HI

Average rainfall days in April - Honolulu, HI
  • Average rainfall days in April: 17.3 days

Months with the highest number of rainy days are March and October (18 days).
The month with the least rainy days is January (12.6 days).

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Average sea temperature in April
Honolulu, HI

Average sea temperature in April - Honolulu, HI
  • Average sea temperature in April: 76.8°F

The best month for swimming (with the highest average sea temperature) is September (80.4°F).
The coldest month (with the lowest average sea temperature) is March (75.7°F).

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Average daylight in April /
Average sunshine in April
Honolulu, HI

Average daylight in April / Average sunshine in April - Honolulu, 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: 10.9h).

  • Average sunshine in April: 8.3h

The month with the most sunshine is June (Average sunshine: 10.8h).
Months with the least sunshine are November and December (Average sunshine: 6.5).

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Average sunshine days in April
Honolulu, HI

Average sunshine days in April - Honolulu, HI
  • Average sunshine days in April: 8.3 days

The month with the most sunshine days is January (12.8 days).
The month with the least sunshine days is October (6.3 days).

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Average UV index in April
Honolulu, HI

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

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

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Average cloud cover in April
Honolulu, HI

Average cloud cover in April - Honolulu, HI
  • Average cloud cover in April: 38

The month with the most cloud cover is March (Cloud cover 40).
Months with the least cloud cover are January and September (Cloud cover 33).

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Average visibility in April
Honolulu, HI

Average visibility in April - Honolulu, HI
  • Average visibility in April: 6mi

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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