Honolulu, Hawaii weather in September

Averages from 2021–2025 (150 days of record).

Average high: 85°F
Average low: 74°F
Rainy days: ~7 per month
Total precipitation: 0.7 in
Warmest recorded: 88°F
Coldest recorded: 69°F

Expect September days in Honolulu, Hawaii to top out around 85°F and cool to about 74°F overnight, with roughly 7 days of measurable rain across the month. In recent years September has ranged from 69°F to 88°F.

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Current Honolulu, Hawaii forecast → · Historical data by Open-Meteo (ERA5).