Surabaya weather in December
In December, Surabaya has an average high of 30 °C85 °F and an average low of 26 °C79 °F, with about 300 mm12 in of precipitation. It is the 8th warmest month of the year and ranks 3rd for precipitation.
How December compares with other months
Compared with November, December is 1.4 °C2.4 °F cooler on average and wetter by 161 mm6.3 in. Compared with January, December is 0.5 °C1 °F warmer on average and drier by 36 mm1.4 in. Daylight lasts about 12.5 hours around the middle of the month. Average relative humidity is 82% and the average cloud amount 91%.
Is December a good time to visit Surabaya?
December is not among the most comfortable months by our comfort score: it is hot (average high 30 °C85 °F), it is fairly wet (300 mm12 in) and it is humid (82%). The most comfortable months in Surabaya are June–August.
What to wear in December
For Surabaya in December, pack light summer clothes such as T-shirts, shorts or light dresses and a good rain jacket or umbrella and quick-drying shoes.
December in nearby places
| Place | High °C°F | Low °C°F | Precip. mmin |
|---|---|---|---|
| Surabaya | 3085 | 2679 | 30012 |
| Mojokerto | 3187 | 2576 | 28311 |
| Pasuruan | 3086 | 2680 | 27011 |
| Probolinggo | 3187 | 2577 | 25610 |
| Malang | 2882 | 2272 | 27311 |
| Kediri | 3086 | 2476 | 27711 |
| Lumajang | 3087 | 2577 | 25610 |
| Blitar | 2984 | 2474 | 27711 |
| Madiun | 3086 | 2374 | 28011 |
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 December?
In December the average high in Surabaya is 30 °C (85 °F) and the average low is 26 °C (79 °F).
Does it rain a lot in Surabaya in December?
On average about 300 mm (11.8 in) of precipitation falls in December; it ranks 3rd of the 12 months.
Is December 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 December?
In the middle of December 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 December?
The average relative humidity in December is about 82%. Combined with warm days, it can feel muggy.
How cloudy is Surabaya in December?
On average about 91% of the sky is covered by cloud in December. 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.