Pool season · State index
Hawaii Pool Season 2026: Opening & Closing Dates by City
Last updated: July 25, 2026 · 2 cities covered
All 2 covered Hawaii cities model as year-round — no opening dates, no closing deadlines. Rows link to each city's season overview with its live water model and twelve-month temperature curve.
Hawaii: a year round-season pool state| City | Open by | Close by | 80°F+ days |
|---|---|---|---|
| Honolulu | year-round | — | 72 |
| Kailua | year-round | — | 231 |
What the columns mean
"Open by" is the recommended spring date — two weeks before the city's 7-day mean temperature crosses 61°F, the model's proxy for water approaching the 65°F algae-growth zone. "Close by" is the fall deadline — ten days after the water leaves that zone, capped a week ahead of the local 50% first-freeze date. "80°F+ days" counts days whose normal high reaches 80°F: the length of the true warm-swim season, and the fairest single number for comparing Hawaii cities against each other.
Every figure comes from each city's own NOAA 1991–2020 normals station (named in its guide's footer), so neighboring cities can legitimately differ by a few days. The season overview linked from each row adds the live water-temperature model and the full-year season bar; the state hubs above carry the step-by-step checklists.
Swim-season length across Hawaii
The fairest way to compare Hawaii cities is the number of days with 80°F+ normal highs — the practical warm-swim season. Every bar links to that city's one-page season overview with the live water model.
Hawaii pool climate at a glance
Tropical warmth and steady trade winds keep Hawaii pools open every month of the year, with passing windward showers rather than cold the only real interruption. In model terms that makes Hawaii a year-round-season state. The spread shows up clearly on the local pages: compare Kailua's pool season with Honolulu's and the difference is measured in weeks, not days. Neighbors in the index run on their own normals too — see Georgia and Idaho for the adjacent calendars.
Hawaii pool season FAQ
Which Hawaii city has the longest swim season?
Kailua leads with 231 days of 80°F+ highs per year, while Honolulu brings up the rear at 72 days. The chart above ranks every covered city by the same metric.