Warm
Average highs sit around 31°C, giving warm days by monthly-average standards.
September verdict
Mentawai Islands, Indonesia in September
Weather score56Good
Good for holiday weather
Average highs sit around 31°C, giving warm days by monthly-average standards. Sunshine averages 5.9h per day, enough for a balanced month. Rainfall averages 262mm, so showers are a real planning factor.
September weather
Monthly averages
Temp
31°C
Rain
262mm
Sun
5.9h
Sea
29°C
Weather score
56
Good
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Wet
Rainfall averages 262mm, so showers are a real planning factor.
Some sun
Sunshine averages 5.9h per day, enough for a balanced month.
Warm sea
Sea temperatures average 29°C, so swimming is usually comfortable by monthly-average standards.
Map
Weather map
Compare Mentawai Islands, Indonesia with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
September31°C average high
September is close to Mentawai Islands' usual daytime heat, with little temperature swing across the year.
Warmest monthsAll year
Daytime heat stays consistently warm through the year.
Rain
September262mm average rain
September sits near Mentawai Islands' yearly rainfall average, so rain is a normal planning factor rather than an outlier.
Driest monthsFebruary, May to June, and August
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
September5.9 hours average sun
September is below Mentawai Islands' yearly sunshine average, so bright-day planning is less reliable than in peak months.
Brightest monthsFebruary and April to August
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
September29°C average sea
September is part of a consistently warm sea-temperature pattern, so swimming comfort changes little through the year.
Warmest seaAll year
Sea temperatures stay warm enough for easy swimming through the year.
Weather score
September56 weather score
September sits close to Mentawai Islands' yearly weather-score average, giving a typical overall read on the month.
Best weather monthsFebruary and May to August
These months have the strongest weather score in the monthly averages.