Surabaya weather in September
September in Surabaya: hot, dry — a great time to visit.
#3 of 12 months in Surabaya · #616 of 897 destinations to visit in September · comfort 74/100 (tier B)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Surabaya in September
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Surabaya climate normals — September
| Daytime high | 33°C / 91°F | 🥵 hot |
|---|---|---|
| Nighttime low | 25°C / 77°F | |
| Rainfall | 21 mm / 0.8 in | ☀️ dry |
| Rainy days | 5 days | |
| Humidity | 67% | 💧 humid |
| Dew point | 21°C / 70°F | |
| Sunshine | 11 h/day | |
| Daylight | 12.1 h | |
| Wind | 14 km/h / 9 mph | |
| Air quality (US AQI) | 76 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Surabaya in September — FAQ
- Is September a good time to visit Surabaya?
- September in Surabaya: hot, dry — a great time to visit. It ranks #3 of 12 months for Surabaya on SeasonMap's comfort score (74/100).
- What is the weather like in Surabaya in September?
- In September, Surabaya averages a daily high of 32.8°C and a low of 24.9°C, with about 21.2 mm of rain over roughly 4.6 rainy days.
- What is the air quality in Surabaya in September?
- Surabaya has a mean US Air Quality Index of about 76 in September.