Honolulu, Hawaii weather in September
Temperature, sea and sunshine in September: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in September
Excellent
Best time to visit: January – December
What is the weather like in Honolulu, Hawaii in September?
In September, Honolulu, Hawaii is hot: daytime highs average 28 °C, and even at night it stays warm at around 25 °C. The sea averages 26.9 °C – lovely and warm for swimming. With around 10 hours of sunshine a day, there is plenty of sun. Rain falls on about 6 days, adding up to 18 mm. The air is often humid and muggy. All in all, September is an excellent month for a holiday in Honolulu, Hawaii.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 96 | 97 | 95 |
| Day | 28° | 28° | 27° |
| Night | 25° | 25° | 24° |
| Sea | 27° | 27° | 27° |
| Sun | 10 h | 10 h | 9 h |
| Rain days | 7 | 6 | 8 |
More details for September
- Daylight
- 12 h 18 min06:18 – 18:36
- UV index
- 11 · extremeclear sky, noon (estimate)
- Muggy days
- 30 daysdew point 18 °C or more
- Wind
- 21 km/haverage daily peak
- Cloud cover
- 41 %on average
- Hot days
- 0 days30 °C or more
- Time zone
- UTC−10Pacific/Honolulu
How the score comes together
- Temperatureweight 35 %100 %
- Seaweight 25 %100 %
- Sunshineweight 20 %100 %
- Few rainy daysweight 20 %84 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Sun, sea & sand”.
What to pack in September
- Swimwear
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- Insect repellent
Honolulu, Hawaii in September: quick answers
Is Honolulu, Hawaii hot in September?
Yes. In September, Honolulu, Hawaii is hot: daytime highs average 28 °C and nights stay around 25 °C.
Can you swim in Honolulu, Hawaii in September?
Yes. In September the sea averages 26.9 °C – lovely and warm for swimming.
Does it rain much in Honolulu, Hawaii in September?
Rain falls on about 6 days, adding up to 18 mm.
Honolulu, Hawaii month by month
The whole year in Honolulu, HawaiiAll destinations: USA
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, GeoNames (CC BY 4.0)