Weather in Honolulu in March

A good month. March is a solid month to be in Honolulu. Highs average 24.9 °C, lows 22 °C, and rain falls on 14 days — nothing in the month is working against you.

Honolulu barely has seasons. March scores 73 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 14 days, 3 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 March reaches 30 °C; the day barely swings — 2.9 °C between the overnight low and the afternoon high. Across the twenty years measured, the hottest March day reached 27.3 °C and the coldest night fell to 18.3 °C, and the wettest single day dropped 47 mm — roughly 50% of the month's rain in one day.

This is the volatile part. March rainfall has ranged from 6 mm to 387 mm across the twenty years measured — a 381 mm spread around an average of 94 mm. The average is real but almost no individual March looks like it, so treat the figure as the middle of a wide range rather than a forecast.

Wind sits around 18.6 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 March sits in the year

Temperatures hold steady either side: 24.6 °C in February, 24.9 here, 25.7 in April. Nothing about the timing within the month matters much.

Daylight in March

12 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 23.7 °C in March — comfortable for a proper swim. 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

Quiet. Few other visitors, cheaper rooms, and a real chance some seasonal operators are shut.

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

March in Honolulu versus nearby

Honolulu has no close neighbour worth comparing against, so the useful question is how March there compares with March elsewhere. San Francisco in March is a different proposition entirely — 8.6 °C cooler, and the harder one overall — 16.3 °C and rain on 10 days, against 24.9 °C and 14 here. San Jose in March is a different proposition entirely — 6.8 °C cooler, and no easier once the rain is counted — 18.1 °C and rain on 9 days, against 24.9 °C and 14 here.

So: March works, with May the better month by 8 points if the dates can move. If they cannot, nothing here should stop you booking.

Every month in Honolulu

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