Honolulu is a warm-all-year destination where rainfall, not temperature, decides your best window. The numbers below are real — monthly weather computed from the ERA5 climate archive for Honolulu's exact coordinates — so this page answers the question most guides dodge: which months are actually worth your leave days?
The short answer: aim for June, July, September, skip May if you can, and read the packing notes before you book. The dry season's first and last weeks offer peak weather at below-peak prices.
| Month | Day / Night | Rain | Travel score |
|---|---|---|---|
| January | 25.4° / 18.6°C | 141mm | 82 |
| February | 24.8° / 19.1°C | 21mm | 97 |
| March | 25.6° / 19.8°C | 22mm | 97 |
| April | 26.3° / 20.2°C | 72mm | 91 |
| May | 26.8° / 21°C | 165mm | 79 · toughest |
| June | 27.9° / 22°C | 13mm | 98 · best |
| July | 28.5° / 22.6°C | 16mm | 98 |
| August | 29.2° / 23.2°C | 48mm | 94 |
| September | 29.6° / 23.1°C | 13mm | 98 |
| October | 29.1° / 22.9°C | 28mm | 97 |
| November | 27.4° / 21.6°C | 21mm | 97 |
| December | 27.4° / 20.4°C | 18mm | 98 |
Pack light cottons, reef-safe sunscreen, mosquito repellent, and one light rain layer. Comfortable walking shoes beat everything else in your bag.
Give Honolulu 3–5 focused days. Mornings for the headline sights (crowds arrive after 10), afternoons for neighbourhoods, evenings for food. The free RoamWise planner turns this into a full day-by-day itinerary with budgets in your currency — and shows the crowd calendar for Honolulu next to 195+ other destinations.
🥷 Plan Honolulu free — crowd calendar, budget & AI itinerary →June, July, September score highest on our weather-comfort index — daytime around 27.9°C with manageable rainfall. The dry season's first and last weeks offer peak weather at below-peak prices.
May is the toughest window (26.8°C days, ~165mm rain). Humidity peaks with the rains — book air-conditioned stays in the wet months.
Pack light cottons, reef-safe sunscreen, mosquito repellent, and one light rain layer.
Most travelers are happy with 3–5 focused days; add 2 more if you want day trips around Hawaii. The free RoamWise planner builds the day-by-day plan.