Surabaya weather in September
September is one of the best months to visit Surabaya: highs of 33°C (92°F) and about 18 mm (0.7 in) of rain on average. Nights average 25°C (78°F) and cloud cover 40% (NASA POWER, 2001–2025 averages). The sea averages 31°C (87°F). It is the 2nd driest month of the year and the warmest. Compared with August, it is warmer and wetter; October brings highs of 33°C (92°F) and 63 mm (2.5 in) of rain.
Is September a good time to visit Surabaya?
best month Weather score 79/100.
Yes. September is one of the best months for weather in Surabaya.
Does it rain a lot in Surabaya in September?
No, it is usually dry: about 18 mm (0.7 in) falls in an average September. It is the 2nd driest month of the year.
How warm is Surabaya in September?
Days average 33°C (92°F) and nights 25°C (78°F).
Surabaya weather by month
| Month | High | Low | Rain | Cloud | Sea | Weather |
|---|---|---|---|---|---|---|
| January | 29°C (84°F) | 26°C (78°F) | 337 mm | 90% | 31°C (88°F) | least pleasant |
| February | 29°C (83°F) | 25°C (78°F) | 316 mm | 88% | 32°C (89°F) | least pleasant |
| March | 29°C (84°F) | 26°C (78°F) | 272 mm | 84% | 32°C (89°F) | least pleasant |
| April | 30°C (85°F) | 26°C (79°F) | 193 mm | 76% | 32°C (90°F) | fair |
| May | 30°C (86°F) | 26°C (79°F) | 123 mm | 61% | 31°C (88°F) | fair |
| June | 30°C (87°F) | 25°C (77°F) | 74 mm | 52% | 31°C (87°F) | best |
| July | 31°C (88°F) | 24°C (76°F) | 35 mm | 45% | 30°C (85°F) | best |
| August | 32°C (90°F) | 24°C (76°F) | 11 mm | 39% | 30°C (86°F) | best |
| September | 33°C (92°F) | 25°C (78°F) | 18 mm | 40% | 31°C (87°F) | best |
| October | 33°C (92°F) | 26°C (80°F) | 63 mm | 58% | 32°C (89°F) | fair |
| November | 32°C (89°F) | 27°C (80°F) | 140 mm | 78% | 32°C (90°F) | fair |
| December | 30°C (85°F) | 26°C (78°F) | 300 mm | 91% | 32°C (89°F) | least pleasant |
Sources: 2001–2025 monthly averages from NASA POWER (MERRA-2 reanalysis), sea temperature from Open-Meteo Marine. Page updated . How we rate months