Warm
Average highs sit around 31°C, giving warm days by monthly-average standards.
September verdict
Indonesia in September
Weather score71Very good
Very good for holiday weather
Average highs sit around 31°C, giving warm days by monthly-average standards. Sunshine averages 7.4h per day, enough for a balanced month. Rainfall averages 128mm, so some wet days are possible.
September weather
Monthly averages
Temp
31°C
Rain
128mm
Sun
7.4h
Sea
25°C
Weather score
71
Very good
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Showers
Rainfall averages 128mm, so some wet days are possible.
Some sun
Sunshine averages 7.4h per day, enough for a balanced month.
Swimmable
Sea temperatures average 25°C, which can work for swimming but may feel fresh.
Map
Weather map
Compare Indonesia with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
September31°C average high
September is close to Indonesia's usual daytime heat, with little temperature swing across the year.
Warmest monthsJanuary to September
Daytime heat stays consistently warm through the year.
Rain
September128mm average rain
September sits on the drier side of Indonesia's year, which helps with sightseeing and transfers.
Driest monthsJune to September
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
September7.4 hours average sun
September is one of Indonesia's sunniest months, with some of the strongest bright-day conditions in the yearly averages.
Brightest monthsApril to September
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
September25°C average sea
September is close to Indonesia's usual sea temperature, with limited seasonal change in the water.
Warmest seaJanuary to July and September
Sea temperatures are usually near 25°C in this stretch, so swimming comfort is at its strongest.
Weather score
September71 weather score
September scores above Indonesia's yearly average, so the overall weather mix is stronger than most months.
Best weather monthsJune to September
These months have the strongest weather score in the monthly averages.