September · United States
Best time to visit Honolulu in September Weather, crowds & prices
Weather in Honolulu in September
Average temperature 27°C, 24 mm of rain, about 30 days with 6+ hours of sunshine and 72% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
September score
9.8/10
Ranked #4 of 12 months
- Avg temp
- 27°C
- Rainfall
- 24 mm
- Humidity
- 72%
- Days with 6h+ sun
- 30
- Crowd Density
- Moderate Crowds
- Average Expenses
- $$ · Moderate Cost ($$)
September in Honolulu scores 9.8/10 for beach and coastal travel - an above-average month (#4 of 12). Expect around 27°C, 24 mm of rain, and roughly 30 days with 6+ hours of sunshine this month.
Honolulu pairs Waikiki's sheltered surf with Diamond Head, Pearl Harbor, and a compact, walkable downtown.
September is one of the strongest months in Honolulu (4th)
September averages 27°C (80°F) and humidity near 72%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
Expect 24 mm of rain — occasional showers rather than washed-out days — alongside about 30 days with 6+ hours of sunshine and 12.1 daylight hours.
A 9.8/10 puts this among the year's best months in Honolulu (4th of 12); only July scores higher, at 9.9/10.
Pack the lightest breathable clothing you own, a hat, and more water than feels necessary.
Figure on mid-season pricing, with crowds are moderate.
Frequently asked
- What is the weather like in Honolulu in September?
- In September, Honolulu averages 27°C, 24 mm of rain, and about 30 days with 6+ hours of sunshine. Its climate-comfort score is 9.8/10.
- Is September a good time to visit Honolulu?
- September earns a 9.8/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Honolulu in September?
- Expect about 24 mm of rain in September. Average humidity is 72% and there are about 30 days with 6+ hours of sunshine.
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