Surabaya weather in December
Temperature, sea and sunshine in December: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in December
Poor
Best time to visit: June – September
What is the weather like in Surabaya in December?
In December, Surabaya is hot: daytime highs average 30 °C, and even at night it stays warm at around 25 °C. The sea averages 29.8 °C – almost as warm as a bath. Expect around 5 hours of sunshine a day. It is the rainy season: rain falls on about 29 days, totalling 276 mm. On about 16 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, December is not an ideal month for a holiday in Surabaya.
December compared
How the weather changes from November to January. Tap a month to open it.
| NovemberNov | DecemberDec | JanuaryJan | |
|---|---|---|---|
| Score | 34 | 38 | 41 |
| Day | 31° | 30° | 29° |
| Night | 26° | 25° | 25° |
| Sea | 30° | 30° | 29° |
| Sun | 6 h | 5 h | 5 h |
| Rain days | 25 | 29 | 29 |
More details for December
- Daylight
- 12 h 32 min05:08 – 17:40
- UV index
- 12 · extremeclear sky, noon (estimate)All months
- Muggy days
- 31 daysdew point 18 °C or moreAll months
- Wind
- 11 km/haverage daily peakAll months
- Cloud cover
- 89 %on averageAll months
- Hot days
- 16 days30 °C or moreAll months
- Time zone
- UTC+7Asia/Jakarta
How the score comes together
- Temperatureweight 50 %63 %
- Sunshineweight 20 %32 %
- Few rainy daysweight 30 %0 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in December
- Swimwear
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- Water bottle – drink plenty
- Insect repellent
- Rain jacket or umbrella
Surabaya in December: quick answers
Is Surabaya hot in December?
Yes. In December, Surabaya is hot: daytime highs average 30 °C and nights stay around 25 °C. On about 16 days the thermometer climbs to 30 °C or more.
Can you swim in Surabaya in December?
Yes. In December the sea averages 29.8 °C – almost as warm as a bath.
Does it rain much in Surabaya in December?
It rains often – on about 29 days, adding up to 276 mm.
Surabaya month by month
The whole year in SurabayaAll destinations: IndonesiaWhere to go in DecemberSea temperature in December
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences