Surabaya weather in January
In January, Surabaya has an average high of 29 °C84 °F and an average low of 26 °C78 °F, with about 337 mm13 in of precipitation. It is the 11th warmest month of the year and the wettest.
How January compares with other months
Compared with December, January is 0.5 °C1 °F cooler on average and wetter by 36 mm1.4 in. Compared with February, January is about the same temperature and wetter by 21 mm0.8 in. Daylight lasts about 12.5 hours around the middle of the month. Average relative humidity is 85% and the average cloud amount 90%.
Is January a good time to visit Surabaya?
January is not among the most comfortable months by our comfort score: it is hot (average high 29 °C84 °F), it is fairly wet (337 mm13 in) and it is humid (85%). The most comfortable months in Surabaya are June–August.
What to wear in January
For Surabaya in January, pack light summer clothes such as T-shirts, shorts or light dresses and a good rain jacket or umbrella and quick-drying shoes.
January in nearby places
| Place | High °C°F | Low °C°F | Precip. mmin |
|---|---|---|---|
| Surabaya | 2984 | 2678 | 33713 |
| Mojokerto | 3085 | 2476 | 32613 |
| Pasuruan | 2985 | 2679 | 31512 |
| Probolinggo | 3086 | 2577 | 30812 |
| Malang | 2781 | 2271 | 32113 |
| Kediri | 2985 | 2475 | 33213 |
| Lumajang | 3086 | 2576 | 30812 |
| Blitar | 2983 | 2374 | 33213 |
| Madiun | 3085 | 2374 | 33813 |
Nearby places that are more than 1 °C1.8 °F cooler: Malang and Blitar.
Other months in Surabaya
- January29 °C84 °F / 26 °C78 °F
- February29 °C83 °F / 25 °C78 °F
- March29 °C84 °F / 26 °C78 °F
- April30 °C85 °F / 26 °C79 °F
- May30 °C86 °F / 26 °C79 °F
- June30 °C87 °F / 25 °C77 °F
- July31 °C88 °F / 24 °C76 °F
- August32 °C90 °F / 24 °C76 °F
- September33 °C92 °F / 25 °C78 °F
- October33 °C92 °F / 26 °C80 °F
- November32 °C89 °F / 27 °C80 °F
- December30 °C85 °F / 26 °C79 °F
Frequently asked questions
How warm is Surabaya in January?
In January the average high in Surabaya is 29 °C (84 °F) and the average low is 26 °C (78 °F).
Does it rain a lot in Surabaya in January?
On average about 337 mm (13.3 in) of precipitation falls in January; it ranks 1st of the 12 months.
Is January the warmest month in Surabaya?
No. The warmest month in Surabaya is September, with an average high of 33 °C (92 °F). The coldest month is July, with an average low of 24 °C (76 °F).
How long is the day in Surabaya in January?
In the middle of January the day in Surabaya lasts about 12.5 hours from sunrise to sunset. The value is calculated from the position of the city and the sun.
How humid is Surabaya in January?
The average relative humidity in January is about 85%. Combined with warm days, it can feel muggy.
How cloudy is Surabaya in January?
On average about 90% of the sky is covered by cloud in January. This is the mean cloud amount from satellite data, not the number of sunny days.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.