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

April weather forecast and climate
Honolulu, HI

Waikiki beach viewed from above, with clear calm waters on the foot of Honolulu city, Hawaii, with the vast cityscape and mountains in the distance
Waikiki beach viewed from above, with clear calm waters on the foot of Honolulu city, Hawaii, with the vast cityscape and mountains in the distance
April, the same as March, is a moderately hot spring month in Honolulu, Hawaii, with average temperature fluctuating between 71.4°F (21.9°C) and 76.6°F (24.8°C).

Temperature

In Honolulu, the average high-temperature in April is essentially the same as in March - a still moderately hot 76.6°F (24.8°C). In April, the average low-temperature 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, in Honolulu, the rain falls for 17.3 days. Throughout April, 1.02" (26mm) of precipitation is accumulated. In Honolulu, during the entire year, the rain falls for 197.2 days and collects up to 14.61" (371mm) of precipitation.

Ocean temperature

In Honolulu, the average seawater temperature in April is 76.8°F (24.9°C).
Note: 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. (FYI: The Olympic swimming competition requires a water temperature between 77°F (25°C) and 82.4°F (28°C).)

Daylight

The average length of the day is 12.7h.

Sunshine

In April, the average sunshine is 8.3h.

UV index

January through June, October through December, with an average maximum UV index of 6, are months with the lowest UV index in Honolulu. A UV Index value of 6 to 7 symbolizes a high health risk from unsafe exposure to the UV radiation for average individuals.
Note: The daily maximum UV index of 6 interpret into the following advice:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. 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 strength of the UV rays is significantly increased by the reflection of the water and sand.

What is the temperature in April in Honolulu?

The average high-temperature, in April, in Honolulu, Hawaii, is 76.6°F (24.8°C), while the average low-temperature is 71.4°F (21.9°C).

What are the least humid months in Honolulu?

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

What is the average humidity in April in Honolulu?

The average relative humidity in April in Honolulu, Hawaii, is 74%.

How much does it rain in Honolulu in April?

In Honolulu, Hawaii, during April, the rain falls for 17.3 days and regularly aggregates up to 1.02" (26mm) of precipitation.

What is the water temperature in April in Honolulu?

In Honolulu, Hawaii, 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?

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

How many hours of sunshine does Honolulu have in April?

The average sunshine in April in Honolulu, Hawaii, is 8.3h.

What is the month with the lowest UV index in Honolulu?

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

How high is the UV index in April in Honolulu?

In Honolulu, the average daily maximum UV index in April is 6. A UV Index estimate of 6 to 7 represents a high health threat from unprotected exposure to the UV radiation.
Average temperature in April - Honolulu, HI
  • Average high temperature in April: 24.8°C

The warmest month (with the highest average high temperature) is September (27.5°C).
Months with the lowest average high temperature are February and March (23.9°C).

  • Average low temperature in April: 21.9°C

The month with the highest average low temperature is August (24.3°C).
The coldest month (with the lowest average low temperature) is February (20.6°C).

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%).

Average rainfall in April - Honolulu, HI
  • Average rainfall in April: 26mm

Wettest months (with the highest rainfall) are March and October (46mm).
The driest month (with the lowest rainfall) is July (17mm).

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 lowest number of rainy days is January (12.6 days).

Average sea temperature in April - Honolulu, HI
  • Average sea temperature in April: 24.9°C

The best month for swimming (with the highest average sea temperature) is September (26.9°C).
The coldest month (with the lowest average sea temperature) is March (24.3°C).

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 shortest days is December (Average daylight: 10.9h).

  • Average sunshine in April: 8.3h

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

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).