Warm
Average highs sit around 27°C, giving warm days by monthly-average standards.
September verdict
Rarotonga, Cook Islands in September
Weather score77Very good
Very good for holiday weather
Average highs sit around 27°C, giving warm days by monthly-average standards. Sunshine averages 0h per day, so this is not one of the brighter months. Rainfall averages 83mm, so some wet days are possible.
September weather
Monthly averages
Temp
27°C
Rain
83mm
Sun
0h
Sea
25°C
Weather score
77
Very good
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Showers
Rainfall averages 83mm, so some wet days are possible.
Limited sun
Sunshine averages 0h per day, so this is not one of the brighter months.
Swimmable
Sea temperatures average 25°C, which can work for swimming but may feel fresh.
Map
Weather map
Compare Rarotonga, Cook Islands with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
September27°C average high
September is on the cooler side of Rarotonga's year, useful if you prefer less intense daytime heat.
Warmest monthsJanuary to April and November to December
This stretch sets the upper range for average daytime heat.
Rain
September83mm average rain
September sits on the drier side of Rarotonga's year, which helps with sightseeing and transfers.
Driest monthsJune to October
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
September0 hours average sun
September is close to Rarotonga's usual sunshine level, with limited seasonal swing across the year.
Brightest monthsAll year
Sunshine stays consistently strong through the year.
Sea temperature
September25°C average sea
September is one of the coolest sea months, so the water may feel fresher than in peak months.
Warmest seaJanuary to April
Sea temperatures are usually near 27°C in this stretch, so swimming comfort is at its strongest.
Weather score
September77 weather score
September scores above Rarotonga's yearly average, so the overall weather mix is stronger than most months.
Best weather monthsJune and August to November
These months have the strongest weather score in the monthly averages.