Kaunakakai Weather in September

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

The climate in Kaunakakai during September can be summarized as hot and dry.

September is in the fall / autumn in Kaunakakai and is typically the 2nd warmest month of the year. Daytime maximum temperatures average around a warm 30°C (86°F), whilst at night 21°C (69°F) is normal.

Kaunakakai weather averages (imperial / metric)
Daytime temperature 29.8°C 85.6°F
Nightly temperature 20.7°C 69.2°F
Average temperature 25.2°C 77.4°F
Daily sunshine 9.4 hrs
Avg rainfall 13 mm 0.5 ins
Rainy days 7 days
Sea temperature 26.8°C 80.3°F
Humidity 69%
Windspeed 19.4kph 12 mph

On average September is the 4th driest month of the year in Kaunakakai with around 13mm 0.5 inches of rain making it a dry time to visit. This rainfall is typically spread over 7 days, although this may vary considerably.

On the flip side this corresponds to an average of 9.4 hours of sunshine per day.

September temperatures in Kaunakakai

Kaunakakai average temperature in September

September rainfall

Kaunakakai average rain in September

September hourly sunshine

Kaunakakai 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 Kaunakakai 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

Kaunakakai weather stats

Kaunakakai weather statistics
Hottest month: August 29.4°C 84.9°F
Driest month: June 11mm 0.4ins
Sunniest month: September 9.4hrs
Coldest month: January 25.4°C 77.7°F
Wettest month: January 114mm 4.5ins
Map showing location of Kaunakakai (21.09333, -157.02389) Kaunakakai map pin © Google

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