Warm
Average highs sit around 29°C, giving warm days by monthly-average standards.
September verdict
Koloa, Hawaii, United States in September
Weather score70Good
Good for holiday weather
Average highs sit around 29°C, giving warm days by monthly-average standards. Sunshine averages 8h per day, so bright days are a strong part of the month. Rainfall averages 123mm, so some wet days are possible.
September weather
Monthly averages
Temp
29°C
Rain
123mm
Sun
8h
Sea
27°C
Weather score
70
Good
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Showers
Rainfall averages 123mm, so some wet days are possible.
Bright
Sunshine averages 8h per day, so bright days are a strong part of the month.
Swimmable
Sea temperatures average 27°C, which can work for swimming but may feel fresh.
Map
Weather map
Compare Koloa, Hawaii, United States with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
September29°C average high
September is one of Koloa's warmest months, with daytime heat above the yearly average.
Warmest monthsJune to October
This stretch sets the upper range for average daytime heat.
Rain
September123mm average rain
September sits on the drier side of Koloa's year, which helps with sightseeing and transfers.
Driest monthsJune to July and September
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
September8 hours average sun
September is brighter than Koloa's yearly average, though the strongest sunshine usually sits closer to the peak months.
Brightest monthsMay to September
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
September27°C average sea
September is one of Koloa's warmest sea months, when swimming comfort is usually strongest.
Warmest seaJune to November
Sea temperatures are usually near 26°C in this stretch, so swimming comfort is at its strongest.
Weather score
September70 weather score
September scores above Koloa's yearly average, so the overall weather mix is stronger than most months.
Best weather monthsMay to October
These months have the strongest weather score in the monthly averages.
