Kona (Big Island) in September
In September, Kona (Big Island) averages 27°C (81°F) during the day and 23°C (73°F) at night, with frequent rain — about 27 days of the month see precipitation (206 mm total).
Off-peakConditions are warm and beach-friendly. Expect daily rain or showers, often in heavy bursts.
It's peak hurricane season in Kona (Big Island) 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 Kona (Big Island)
September is one of the warmest months in Kona (Big Island) (1st of 12) and moderately rainy compared to the rest of the year (6th of 12). Daytime temperature runs 1°C above the annual average (26°C). September runs roughly the same as August (27°C) and stays flat into October.
September sunrise & sunset in Kona (Big Island)
Times shown for Kona (Big Island) 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 Kona (Big Island) — September
Golden-hour and blue-hour windows for the 15th of September, in Kona (Big Island)'s local time. Use these for soft warm light (golden) or cool architectural twilight (blue).
📅 When to book — Kona (Big Island) 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 Kona (Big Island)'s popularity.
Crowds & pricing — September in Kona (Big Island)
This is off-peak for Kona (Big Island) — 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: peak hazard season (2 active)
Sun & mosquito risk — September in Kona (Big Island)
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 Kona (Big Island) — September
Across the year Kona (Big Island)'s sea swings from 25°C (March) to 27.3°C (September) — September sits at 27.3°C.
Kona (Big Island) in other months
| Month | Avg high | Avg low | Rainfall | Rain days | Snow days |
|---|---|---|---|---|---|
| January | 25°C / 76°F | 19°C / 67°F | 97 mm | 23 | — |
| February | 25°C / 76°F | 19°C / 67°F | 118 mm | 22 | — |
| March | 25°C / 77°F | 20°C / 68°F | 111 mm | 23 | — |
| April | 25°C / 77°F | 21°C / 69°F | 207 mm | 27 | — |
| May | 26°C / 78°F | 21°C / 70°F | 224 mm | 28 | — |
| June | 26°C / 79°F | 22°C / 71°F | 301 mm | 29 | — |
| July | 27°C / 81°F | 23°C / 73°F | 296 mm | 30 | — |
| August | 27°C / 81°F | 23°C / 73°F | 278 mm | 29 | — |
| September | 27°C / 81°F | 23°C / 73°F | 206 mm | 27 | — |
| October | 27°C / 81°F | 22°C / 72°F | 138 mm | 25 | — |
| November | 26°C / 80°F | 21°C / 70°F | 103 mm | 22 | — |
| December | 25°C / 77°F | 20°C / 68°F | 134 mm | 23 | — |
Other cities with similar September weather
🌍 See the full ranked list of climate twins for Kona (Big Island) in September →
Frequently asked questions
How hot is Kona (Big Island) in September?
In September, Kona (Big Island) averages a high of 27°C (81°F) and a low of 23°C (73°F) — generally warm.
Does it rain a lot in Kona (Big Island) in September?
September is quite rainy in Kona (Big Island), with about 27 rainy days on average.
Is September a good time to visit Kona (Big Island)?
September is warm but on the rainy side. It suits travelers who are comfortable with warm weather; check the month-by-month ranking to compare it against the rest of the year.
What should I pack for Kona (Big Island) in September?
Pack lightweight, breathable clothing, sunglasses and sunscreen, plus a compact umbrella or rain jacket. See the full September packing list for Kona (Big Island) for a complete, climate-based checklist.
Check the live 10-day forecast and sunrise/sunset.