Weather in Honolulu in April

Prime time. April is about as good as Honolulu gets. Highs average 25.7 °C, lows 22.7 °C, and rain falls on 12 days — nothing in the month is working against you.

Honolulu barely has seasons. April scores 79 out of 100 against a best of 81 in May — a gap small enough that the month you choose matters far less here than the week you choose.

Rain on 12 days, 1 of them heavy. Enough to need a plan B, not enough to need a plan around it. Nothing specialised needed — this is the month you pack for the trip rather than for the weather.

What the averages hide

Averages flatten a month, and this one hides a few things: it never really gets hot: not one day in an average April reaches 30 °C; the day barely swings — 3 °C between the overnight low and the afternoon high. Across the twenty years measured, the hottest April day reached 27.7 °C and the coldest night fell to 19.6 °C.

April is moderately variable: 2 mm in the driest year against 153 mm in the wettest, around an average of 54 mm. Roughly two Aprils in three land near that average, and the third does something else entirely.

Wind sits around 20 km/h — a steady breeze rather than a nuisance, and welcome on the warmer days, and humidity runs at 75%, high enough to notice on the warm days without dominating them.

How April sits in the year

Temperatures hold steady either side: 24.9 °C in March, 25.7 here, 26.8 in May. Nothing about the timing within the month matters much.

Daylight in April

12.6 hours of daylight, gaining 0.6 hours across the month. That is between Honolulu's extremes of 13.4 and 10.8 hours, so days are long enough not to constrain the plan.

Sea temperature

The sea sits at about 24 °C in April — warm enough to stay in as long as you like. The sea peaks at 26.6 °C in September and bottoms out at 23.7 °C — water lags the air by a month or two, which is why the best swimming often comes after the best weather.

How busy it gets

Busy. Popular without being frantic; book the things you care about, improvise the rest.

Crowd levels are estimated from climate desirability and school-holiday calendars, not from visitor numbers.

April in Honolulu versus nearby

Honolulu has no close neighbour worth comparing against, so the useful question is how April there compares with April elsewhere. San Francisco in April is a different proposition entirely — 8.3 °C cooler, and no easier once the rain is counted — 17.4 °C and rain on 6 days, against 25.7 °C and 12 here. San Jose in April is a different proposition entirely — 5.7 °C cooler, and the easier month overall — 20 °C and rain on 6 days, against 25.7 °C and 12 here.

So: April is effectively as good as it gets here — 2 points behind May, which is inside the margin where the weather stops being the deciding factor and price starts being it.

Every month in Honolulu

See all twelve months in Honolulu, or where else to go in April.