Climate averages 1991–2020
Surabaya weather
in January.
A hot, very wet month: one of the coolest and the wettest of the year.
Long-term climate patterns, not a forecast for a particular trip.
January is a hot month in Surabaya: daytime highs average 29.3°C and nights cool to about 24.8°C. By daytime temperature it is one of the coolest months of the year.
Expect about 280 mm of rain on roughly 29 days, which makes January a very wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 12 h 29 min on an average January day.
The nearest other city in this atlas is Kebomas (16 km away). In January its highs average 29.1°C, about as warm as Surabaya, with 280 mm of rain.
Among the 200 cities listed in Indonesia, Surabaya ranks joint 22nd of 200 for the warmest January highs and joint 65th of 200 for the driest January (rainfall, lowest first). The mean January high of those 200 cities is 28.2°C; Surabaya is 1.1°C warmer than that mean.
From January to February, average highs stay level at 29.3°C, and monthly rainfall falls from 280 mm to 262 mm.
The annual picture
January in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Surabaya climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January, selected | 29.3°C24.8°C | 24.8°C | 280 | 29.4 | 12.512 h |
| February | 29.3°C24.8°C | 24.8°C | 262 | 27.3 | 12.312 h |
| March | 29.8°C25.0°C | 25.0°C | 268 | 28.9 | 12.112 h |
| April | 30.1°C25.1°C | 25.1°C | 186 | 23.9 | 11.912 h |
| May | 30.5°C25.1°C | 25.1°C | 86 | 14.5 | 11.812 h |
| June | 30.4°C24.5°C | 24.5°C | 49 | 9.0 | 11.712 h |
| July | 30.6°C23.9°C | 23.9°C | 22 | 4.5 | 11.712 h |
| August | 31.5°C23.9°C | 23.9°C | 6.4 | 1.5 | 11.912 h |
| September | 32.9°C24.5°C | 24.5°C | 20 | 3.3 | 12.112 h |
| October | 32.9°C25.3°C | 25.3°C | 73 | 12.5 | 12.312 h |
| November | 31.3°C25.5°C | 25.5°C | 179 | 24.1 | 12.412 h |
| December | 29.9°C25.1°C | 25.1°C | 274 | 28.7 | 12.513 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
January in nearby cities
- Kebomas in JanuaryIndonesia · 16 kmHigh 29.1°C · Low 24.2°C · 280 mm rain
- Sidoarjo in JanuaryIndonesia · 22 kmHigh 29.6°C · Low 23.7°C · 298 mm rain
- Bangkalan in JanuaryIndonesia · 23 kmHigh 28.8°C · Low 25.2°C · 304 mm rain
- Bangil in JanuaryIndonesia · 40 kmHigh 29.1°C · Low 22.8°C · 298 mm rain
- Mojokerto in JanuaryIndonesia · 42 kmHigh 29.8°C · Low 23.0°C · 517 mm rain
- Pasuruan in JanuaryIndonesia · 47 kmHigh 28.6°C · Low 23.0°C · 376 mm rain
- Lawang in JanuaryIndonesia · 65 kmHigh 27.6°C · Low 21.4°C · 510 mm rain
- Jombang in JanuaryIndonesia · 66 kmHigh 29.4°C · Low 23.0°C · 286 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Surabaya) is explained once on the Surabaya year overview and on the Sources, method and limits page.
Kebomas lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.