Weather in September
September signals a gradual transition towards autumn accompanied by falling daylight hours and increased sea temperatures. In this month, the highest sea temperature of 80.5°F (26.9°C) is noted, at the tail end of the summer. A decrease in daylight marks this transition, with an average of 12.3 hours noted. The weather progression towards cooler climes and shorter days will continue into the next month. However, September's weather stays steady, not displaying strikingly unique or erratic weather conditions.
Ocean temperature
With an average ocean temperature of 80.4°F (26.9°C), September is the month with the warmest seawater in
Waimea Canyon State Park,
Hawaii.
Note: Water temperatures between 77°F (25°C) and 84.2°F (29°C) are regarded as very warm, ensuring all water activities are pleasurable for extended periods without feeling uneasy.
Daylight
In Waimea Canyon State Park, Hawaii, the average length of the day in September is 12h and 16min.
On the first day of September in Waimea Canyon State Park, sunrise is at 6:21 am and sunset at 6:54 pm. On the last day of the month, sunrise is at 6:30 am and sunset at 6:26 pm HST.
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