Waikoloa Weather in September

What's the weather like in Waikoloa (Hawaii) in September 2025?

The climate in Waikoloa during September can be summarized as warm, humid and reasonably dry.

September is in the fall / autumn in Waikoloa and is typically the 2nd warmest month of the year. Daytime maximum temperatures average around a muggy 26°C (79°F), whilst at night 17°C (63°F) is normal.

Waikoloa weather averages (imperial / metric)
Daytime temperature 26.1°C 78.9°F
Nightly temperature 17.4°C 63.4°F
Average temperature 21.8°C 71.2°F
Daily sunshine 7 hrs
Avg rainfall 71 mm 2.8 ins
Rainy days 17 days
Sea temperature 26.7°C 80.1°F
Humidity 76%
Windspeed 15.8kph 10 mph

On average September is the 2nd driest month of the year in Waikoloa with around 71mm 2.8 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 17 days, although this may vary considerably.

On the flip side this corresponds to an average of 7 hours of sunshine per day.

September temperatures in Waikoloa

Waikoloa average temperature in September

September rainfall

Waikoloa average rain in September

September hourly sunshine

Waikoloa average rain in September

The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Waikoloa in September 2025.

Other monthly averages

Best places to visit in September

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

Waikoloa weather stats

Waikoloa weather statistics
Hottest month: August 25.8°C 78.4°F
Driest month: June 68mm 2.7ins
Sunniest month: February 6.8hrs
Coldest month: March 23.2°C 73.8°F
Wettest month: March 233mm 9.2ins
Map showing location of Waikoloa (19.94306, -155.79028) Waikoloa map pin © Google

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