Hot
Average highs reach 32°C, so days can feel very hot.
September verdict
Dumai, Indonesia in September
Weather score56Good
Good for holiday weather
Average highs reach 32°C, so days can feel very hot. Sunshine averages 5.7h per day, enough for a balanced month. Rainfall averages 218mm, so showers are a real planning factor.
September weather
Monthly averages
Temp
32°C
Rain
218mm
Sun
5.7h
Sea
30°C
Weather score
56
Good
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Wet
Rainfall averages 218mm, so showers are a real planning factor.
Some sun
Sunshine averages 5.7h per day, enough for a balanced month.
Warm sea
Sea temperatures average 30°C, so swimming is usually comfortable by monthly-average standards.
Map
Weather map
Compare Dumai, Indonesia with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
September32°C average high
September is close to Dumai's usual daytime heat, with little temperature swing across the year.
Warmest monthsAll year
Daytime heat stays consistently warm through the year.
Rain
September218mm average rain
September is wetter than Dumai's yearly average, so flexible plans matter more.
Driest monthsJanuary to February and May to July
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
September5.7 hours average sun
September is below Dumai's yearly sunshine average, so bright-day planning is less reliable than in peak months.
Brightest monthsFebruary to August
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
September30°C average sea
September is close to Dumai's yearly sea-temperature average, so swimming comfort is fairly typical.
Warmest seaMarch to November
Sea temperatures are usually near 29°C in this stretch, so swimming comfort is at its strongest.
Weather score
September56 weather score
September scores below Dumai's yearly average, so the weather trade-offs are more noticeable.
Best weather monthsJanuary to August
These months have the strongest weather score in the monthly averages.