Surabaja weather in September 2025

Expect 90°F daytime maximum temperatures in the shade with on average 11 hours of sunshine per day in Surabaja in September. Check more long-term weather averages for Surabaja in September before you book your next holiday to Indonesia in 2025/2026.

  • 90°F maximum daytime temperature in September in Surabaja90
    90°F max day temperature
  • 11 hours of sunshine per day
  • 1 day with some rainfall in September in Surabaja1
    1 day with some rainfall
  • 75°F minimum night-time temperature in September in Surabaja75
    75°F min night temperature
  • 12 hours of daylight per day in September in Surabaja12
    12 hours of daylight per day
  • Very high heat & humidity in September in SurabajaVH
    Very High heat & humidity
  • 0.8 inches monthly rainfall in September in Surabaja0.8
    0.8 inches of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in September in Surabaja11
    11+ (Extreme) UV index
  • 82°F sea temperature in September in Surabaja82
    82°F sea temperature

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The September weather guide for Indonesia (Surabaja) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C)  |  Imperial (°F)

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More about Indonesia

How hot is it in Surabaja in September?

Daytime temperatures usually reach 90°F in Surabaja in September with very high heat and humidity, falling to 75°F at night.

How sunny is it in Surabaja in September?

There are normally 11 hours of bright sunshine each day in Surabaja in September - that's 90% of daylight hours.

How warm is the sea around Surabaja in September?

The average sea temperature around Surabaja in September is 82°F.

Does it ever rain in Surabaja in September?

There is usually 1 day with some rain in Surabaja in September and the average monthly rainfall is 0.8 inches.

Surabaja September sunrise & sunset times

Browse the sunrise and sunset times for Surabaja in September 2025. Select a month to view Surabaja sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:30 17:28
Monday, 15th September 2025 05:23 17:26
Tuesday, 30th September 2025 05:14 17:24

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