Surabaya weather in January
January in Surabaya: hot, soaked, with poor air quality — a gamble, with 29 rainy days.
#9 of 12 months in Surabaya · #684 of 897 destinations to visit in January · comfort 55/100 (tier D)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Surabaya in January
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Surabaya climate normals — January
| Daytime high | 30°C / 85°F | 🥵 hot |
|---|---|---|
| Nighttime low | 25°C / 77°F | |
| Rainfall | 261 mm / 10.3 in | ⛈ soaked |
| Rainy days | 29 days | |
| Humidity | 84% | 💦 very humid |
| Dew point | 24°C / 75°F | |
| Sunshine | 8.7 h/day | |
| Daylight | 12.5 h | |
| Wind | 14 km/h / 9 mph | |
| Air quality (US AQI) | 107 | 😷 poor |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Surabaya in January — FAQ
- Is January a good time to visit Surabaya?
- January in Surabaya: hot, soaked, with poor air quality — a gamble, with 29 rainy days. It ranks #9 of 12 months for Surabaya on SeasonMap's comfort score (55/100).
- What is the weather like in Surabaya in January?
- In January, Surabaya averages a daily high of 29.5°C and a low of 25°C, with about 261.3 mm of rain over roughly 29.4 rainy days.
- What is the air quality in Surabaya in January?
- Surabaya has a mean US Air Quality Index of about 107 in January.