Surabaya weather in August
Temperature, sea and sunshine in August: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in August
Good
Best time to visit: June – September
What is the weather like in Surabaya in August?
In August, Surabaya is hot: daytime highs average 32 °C, and even at night it stays warm at around 24 °C. The sea averages 28.2 °C – lovely and warm for swimming. The sun shines for around 9 hours a day. Rain is rare: about 2 days bring 10 mm in total. On about 30 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, August is a good month for a holiday in Surabaya.
August compared
How the weather changes from July to September. Tap a month to open it.
| JulyJul | AugustAug | SeptemberSep | |
|---|---|---|---|
| Score | 73 | 70 | 62 |
| Day | 31° | 32° | 33° |
| Night | 24° | 24° | 25° |
| Sea | 29° | 28° | 29° |
| Sun | 8 h | 9 h | 9 h |
| Rain days | 5 | 2 | 4 |
More details for August
- Daylight
- 11 h 52 min05:38 – 17:30
- UV index
- 12 · extremeclear sky, noon (estimate)All months
- Muggy days
- 30 daysdew point 18 °C or moreAll months
- Wind
- 13 km/haverage daily peakAll months
- Cloud cover
- 44 %on averageAll months
- Hot days
- 30 days30 °C or moreAll months
- Time zone
- UTC+7Asia/Jakarta
How the score comes together
- Temperatureweight 50 %42 %
- Sunshineweight 20 %95 %
- Few rainy daysweight 30 %100 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in August
- Swimwear
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- Water bottle – drink plenty
- Insect repellent
Surabaya in August: quick answers
Is Surabaya hot in August?
Yes. In August, Surabaya is hot: daytime highs average 32 °C and nights stay around 24 °C. On about 30 days the thermometer climbs to 30 °C or more.
Can you swim in Surabaya in August?
Yes. In August the sea averages 28.2 °C – lovely and warm for swimming.
Does it rain much in Surabaya in August?
Rain is rare: about 2 days bring 10 mm in total.
Surabaya month by month
The whole year in SurabayaAll destinations: IndonesiaWhere to go in AugustSea temperature in August
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