Hot
Average highs reach 33°C, so days can feel very hot.
September verdict
Surabaya, East Java, Indonesia in September
Weather score85Excellent
Excellent for holiday weather
Average highs reach 33°C, so days can feel very hot. Sunshine averages 11h per day, so bright days are a strong part of the month. Rainfall averages 20mm, which is relatively low for holiday planning.
September weather
Monthly averages
Temp
33°C
Rain
20mm
Sun
11h
Sea
29°C
Weather score
85
Excellent
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Drier
Rainfall averages 20mm, which is relatively low for holiday planning.
Bright
Sunshine averages 11h per day, so bright days are a strong part of the month.
Warm sea
Sea temperatures average 29°C, so swimming is usually comfortable by monthly-average standards.
Map
Weather map
Compare Surabaya, East Java, Indonesia with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
September33°C average high
September is close to Surabaya's usual daytime heat, with little temperature swing across the year.
Warmest monthsAll year
Daytime heat stays consistently warm through the year.
Rain
September20mm average rain
September is one of Surabaya's driest months, making outdoor days easier to plan than in wetter parts of the year.
Driest monthsJune to October
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
September11 hours average sun
September is one of Surabaya's sunniest months, with some of the strongest bright-day conditions in the yearly averages.
Brightest monthsJuly to October
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
September29°C average sea
September is below Surabaya's yearly sea-temperature average, so swimming can feel fresher.
Warmest seaJanuary to June and October to December
Sea temperatures are usually near 29°C in this stretch, so swimming comfort is at its strongest.
Weather score
September85 weather score
September is one of Surabaya's best weather-score months, combining the strongest overall balance in the yearly averages.
Best weather monthsJune to October
These months have the strongest weather score in the monthly averages.
Hotels in Surabaya, East Java, Indonesia
Marriott
JW Marriott Hotel SurabayaSurabaya, Indonesia
The Westin SurabayaSurabaya, East Java, Indonesia
Sheraton Surabaya Hotel & TowersSurabaya, East Java, Indonesia
New:Surabaya, East Java, Indonesia
Fairfield by Marriott SurabayaSurabaya, Indonesia
Four Points by Sheraton Surabaya, Pakuwon IndahSurabaya, East Java, Indonesia