Weather in Honolulu in July

Prime time. July is about as good as Honolulu gets. Highs average 28.1 °C, lows 25.1 °C, and rain falls on 10 days — nothing in the month is working against you.

Honolulu barely has seasons. July 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 10 days, 0 of them heavy. Enough to need a plan B, not enough to need a plan around it. Pack for 28.1 °C days and 25.1 °C nights; the spread matters more here than any single number.

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 July reaches 30 °C; the day barely swings — 3 °C between the overnight low and the afternoon high. Across the twenty years measured, the hottest July day reached 30.7 °C and the coldest night fell to 23.3 °C, and the wettest single day dropped 55 mm — roughly 138% of the month's rain in one day.

July is moderately variable: 4 mm in the driest year against 127 mm in the wettest, around an average of 40 mm. Roughly two Julys in three land near that average, and the third does something else entirely.

Wind sits around 22.4 km/h — a steady breeze rather than a nuisance, and welcome on the warmer days, and humidity is unremarkable at 74%.

How July sits in the year

Temperatures hold steady either side: 27.5 °C in June, 28.1 here, 28.5 in August. Nothing about the timing within the month matters much.

Daylight in July

July is at or near the longest days of Honolulu's year: 13.3 hours of daylight, holding steady all month. Evenings are the real gain — dinner outdoors still happens in full light.

Sea temperature

The sea sits at about 25.8 °C in July — 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

Peak season. Expect the highest prices of the year and to be booking well ahead. If the dates are flexible, February is the trade worth considering — 5 points weaker on weather, and materially quieter.

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

July in Honolulu versus nearby

Honolulu has no close neighbour worth comparing against, so the useful question is how July there compares with July elsewhere. San Francisco in July is a different proposition entirely — 5.3 °C cooler, and the easier month overall — 22.8 °C and rain on 0 days, against 28.1 °C and 10 here. San Jose in July is much the same — 31.2 °C and rain on 0 days, against 28.1 °C and 10 here.

So: July 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 July.