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 in Honolulu is less humid then March at an average of 66% monthly. The temperatures rise to read an average between 69.8°F (21°C) and 82.4°F (28°C) getting warmer with the sunshine hours sitting steady at an average of nine per day. The ocean temperature rises to read an average of 77°F (25°C) throughout the month. The rise in temperature signals the approaching hot season and results in a drop during the monthly rainfall. The rain falls in April for an average of thirteen days and collects at 0.7" (17.8mm).
Average temperature in April - Honolulu, HI
  • Average high temperature in April: 28.2°C

The warmest month (with the highest average high temperature) is August (31.5°C).
The month with the lowest average high temperature is January (26.7°C).

  • Average low temperature in April: 20.8°C

The month with the highest average low temperature is August (23.9°C).
The coldest month (with the lowest average low temperature) is February (18.9°C).

Average humidity in April - Honolulu, HI
  • Average humidity in April: 67.3%

The month with the highest relative humidity is January (73.3%).
The month with the lowest relative humidity is August (64.1%).

Average rainfall in April - Honolulu, HI
  • Average rainfall in April: 250mm

The wettest month (with the highest rainfall) is March (291mm).
The driest month (with the lowest rainfall) is June (158mm).

Average rainfall days in April - Honolulu, HI
  • Average rainfall days in April: 7.5 days

The month with the highest number of rainy days is December (9.7 days).
The month with the lowest number of rainy days is August (5.6 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: 8.4h

The month with most sunshine is July (Average sunshine: 9.9h).
The month with least sunshine is December (Average sunshine: 6.4h).

Average UV index in April - Honolulu, HI
  • Average UV index in April: 11

Months with the highest UV index are June, July and August (UV index 12).
The month with the lowest UV index is December (UV index 6).

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