September · Indonesia
Best time to visit Surabaya in September Weather, crowds & prices
Weather in Surabaya in September
Average temperature 29°C, 44 mm of rain, about 27 days with 6+ hours of sunshine and 60% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
September score
7.1/10
Ranked #3 of 12 months
- Avg temp
- 29°C
- Rainfall
- 44 mm
- Humidity
- 60%
- Days with 6h+ sun
- 27
- Crowd Density
- Moderate Crowds
- Average Expenses
- $$ · Moderate Cost ($$)
September in Surabaya scores 7.1/10 for sightseeing and cultural travel - one of the top 12-month picks (#3). Expect around 29°C, 44 mm of rain, and roughly 27 days with 6+ hours of sunshine this month.
Surabaya pairs Indonesia's busiest port with colonial lanes, markets and a shark-and-crocodile landmark.
September in Surabaya — reliably good (3rd best month)
September averages 29°C (84°F), so the practical pattern is early mornings, a long midday break, and evenings back outside.
Expect 44 mm of rain — occasional showers rather than washed-out days — alongside about 27 days with 6+ hours of sunshine and 12 daylight hours.
It scores 7.1/10 here, 3rd of 12 months, against 8.1/10 in the destination's best month.
Pack the lightest breathable clothing you own, a hat, and more water than feels necessary.
Figure on mid-season pricing, with crowds are moderate.
Frequently asked
- What is the weather like in Surabaya in September?
- In September, Surabaya averages 29°C, 44 mm of rain, and about 27 days with 6+ hours of sunshine. Its climate-comfort score is 7.1/10.
- Is September a good time to visit Surabaya?
- September earns a 7.1/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Surabaya in September?
- Expect about 44 mm of rain in September. Average humidity is 60% and there are about 27 days with 6+ hours of sunshine.
Curated in Surabaya
Tickets & experiences
Things to do in Surabaya
Surabaya, Indonesia. Live activities and tours from GetYourGuide, matched to this destination.