Honolulu in September
In September, Honolulu averages 31°C (88°F) during the day and 23°C (73°F) at night, with around 8 days of rain (15 mm total).
Off-peakConditions are warm and beach-friendly. Occasional showers are likely but won't dominate.
It's peak hurricane season in Honolulu during September. Travel is possible but expect storm risk, possible flight disruption, and generally lower travel insurance coverage.
How September compares to the rest of the year in Honolulu
September is one of the warmest months in Honolulu (3rd of 12) and one of the driest months (10th of 12). Daytime temperature runs 2°C above the annual average (29°C). September runs roughly the same as August (31°C) and cools 1°C in October (30°C).
September sunrise & sunset in Honolulu
Times shown for Honolulu local time (Pacific/Honolulu), calculated for the 15th of September. They shift by a few minutes day to day across the month.
Photography light in Honolulu — September
Golden-hour and blue-hour windows for the 15th of September, in Honolulu's local time. Use these for soft warm light (golden) or cool architectural twilight (blue).
📅 When to book — Honolulu in September
Travel writers usually only tell you when to go. Here's when to book flights and lodging for the best mix of price and availability, based on September's tier (Off-peak) and Honolulu's popularity.
Crowds & pricing — September in Honolulu
This is off-peak for Honolulu — the lowest prices of the year and the fewest crowds, but with real trade-offs: some restaurants, hotels, and beach businesses may close for the season; weather conditions can make outdoor activities unpredictable; and a handful of seasonal sights run reduced hours or close entirely. Great if you prefer a quiet local rhythm and don't mind the climate giving you reasons to choose indoor activities.
Why this tier: beach-season conditions peak hazard season (2 active)
Sun & mosquito risk — September in Honolulu
UV is a clear-sky sea-level estimate — clouds, altitude, and reflective surfaces (snow, water) shift it ±30%. Mosquito risk is climate-derived only; for current disease advisories (dengue, malaria, zika) check the CDC or WHO travel pages before your trip.
Sea temperature in Honolulu — September
Across the year Honolulu's sea swings from 24.4°C (March) to 27°C (September) — September sits at 27°C.
Honolulu in other months
| Month | Avg high | Avg low | Rainfall | Rain days | Snow days |
|---|---|---|---|---|---|
| January | 27°C / 81°F | 18°C / 64°F | 75 mm | 9 | — |
| February | 27°C / 81°F | 19°C / 66°F | 55 mm | 8 | — |
| March | 27°C / 81°F | 19°C / 66°F | 45 mm | 8 | — |
| April | 28°C / 82°F | 20°C / 68°F | 20 mm | 8 | — |
| May | 29°C / 84°F | 21°C / 70°F | 20 mm | 6 | — |
| June | 30°C / 86°F | 22°C / 72°F | 10 mm | 7 | — |
| July | 31°C / 88°F | 23°C / 73°F | 10 mm | 8 | — |
| August | 31°C / 88°F | 23°C / 73°F | 15 mm | 8 | — |
| September | 31°C / 88°F | 23°C / 73°F | 15 mm | 8 | — |
| October | 30°C / 86°F | 22°C / 72°F | 55 mm | 9 | — |
| November | 29°C / 84°F | 21°C / 70°F | 75 mm | 10 | — |
| December | 28°C / 82°F | 20°C / 68°F | 85 mm | 10 | — |
Other cities with similar September weather
🌍 See the full ranked list of climate twins for Honolulu in September →
Frequently asked questions
How hot is Honolulu in September?
In September, Honolulu averages a high of 31°C (88°F) and a low of 23°C (73°F) — generally hot.
Does it rain a lot in Honolulu in September?
September sees occasional rain in Honolulu, with about 8 rainy days on average.
Is September a good time to visit Honolulu?
September is hot. It suits travelers who are comfortable with hot weather; check the month-by-month ranking to compare it against the rest of the year.
What should I pack for Honolulu in September?
Pack lightweight, breathable clothing, sunglasses and sunscreen. See the full September packing list for Honolulu for a complete, climate-based checklist.
Check the live 10-day forecast and sunrise/sunset.