Surabaya Weather in September
Surabaya in September averages 34°C (93°F) during the day and 25°C (77°F) at night. Some rainfall is typical for this time of year.
Rainfall in Surabaya in September
Typically around a single day of rainfall are expected, averaging 22 mm (0.9 in) for the month. Any rain that does arrive tends to come in a single sharp spell rather than prolonged drizzle.
Temperature in Surabaya in September
September in Surabaya sees highs of 34°C (93°F) and lows of 25°C (77°F) overnight. Mornings and evenings are often more comfortable than the peak afternoon hours. With overnight lows of 25°C (77°F), evenings and nights remain warm. Light clothing and an open window or fan can help you sleep comfortably.
Sunshine in Surabaya in September
Expect sunny days throughout the month, with an estimated 229 hours of sunshine. This makes it a pleasant time to visit Surabaya.If you prefer dry days with pleasant temperatures, September may not be the ideal month to visit Surabaya. Our weather planner can help you explore destinations with more pleasant weather conditions.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Indonesia, check out our Surabaya's climate page.
Surabaya Temperature in September
Min Temperature
25°C (77°F)
Max Temperature
34°C (93°F)
Chance of Rain
4%
Precipitation
22 mm (0.9 in)
Rainy days
a single day
Humidity
54%
Sunshine
229 hours
Percentage Sunshine
Daily Historical Temperatures
47-year average (1976-2025)
Based on our historical records, temperatures in Surabaya typically stay consistent throughout September, with daily highs averaging around 34°C (93°F). Nights are warm, with lows around 24°C (75°F).
Average temperatures in September
Daily Historical Precipitation
47-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather for Surabaya in September
Browse day-by-day weather records for Surabaya spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Surabaya historical weather extremes in September
According to our 34 years of weather records for Surabaya, the following extremes were recorded between 1991 and 2025.
- The warmest day in September was on September 24, 2020, with a maximum of 36°C (97°F).
- The coldest September day was on September 23, 2003, with a maximum of 24°C (75°F).
- The lowest overnight temperature recorded in September was 15°C (59°F) (September 10, 2002).
Best Places in Indonesia in September
Find out more about the weather in Indonesia and which places have the best travel conditions in this month. See all of Indonesia in September →
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What to Wear in Surabaya in September
Hot weather in September means keeping cool is the priority. Loose-fitting clothes in natural fabrics work best. Pack plenty of shorts, tank tops, and breathable shirts. Don't forget a hat, swimwear, and comfortable sandals. Pack a light rain jacket or compact umbrella for occasional showers. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.What To Do in Surabaya in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Indonesia, check out our Surabaya's climate page.
Temperature Rainfall Sunshine Humidity
See the full Surabaya climate overview or explore weather in Indonesia.
