Best Time to Visit Surabaya
The best time to visit Surabaya is May to September and November, when the average temperature is 26–28°C and rainfall is low for Surabaya, at 11–133 mm a month.
Surabaya weather by month
The wettest month in Surabaya is January with 326 mm of rain, and the warmest is October at an average 29°C. The coolest is February at 25°C.
| Month | Average temperature | Rainfall | Verdict |
|---|---|---|---|
| January | 26°C / 78°F | 326 mm | Wet |
| February | 25°C / 78°F | 321 mm | Wet |
| March | 26°C / 78°F | 280 mm | Wet |
| April | 26°C / 79°F | 194 mm | Wet |
| May | 26°C / 79°F | 121 mm | Best |
| June | 26°C / 78°F | 69 mm | Best |
| July | 26°C / 78°F | 34 mm | Best |
| August | 27°C / 80°F | 11 mm | Best |
| September | 28°C / 83°F | 17 mm | Best |
| October | 29°C / 85°F | 60 mm | Hot |
| November | 28°C / 83°F | 133 mm | Best |
| December | 26°C / 79°F | 283 mm | Wet |
How we pick the best months
- Best: an average temperature of 15–28°C and low rainfall for Surabaya: under 150 mm, and no more than 159 mm, a quarter above Surabaya's median month (never set below 60 mm).
- If no month qualifies, we show the three driest months that average 10–30°C instead.
- Wet: 150 mm of rain or more. Rainy: more than 159 mm. Hot: 29°C or more on average. Cool: under 15°C. Cold: under 5°C.
Averages cover day and night, so afternoons are warmer than the figure shown. Weather is only one reason to pick a month: school holidays, festivals and prices matter too.
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Where these numbers come from
Monthly averages for January 2001 – December 2020 from the NASA POWER project, for the area around Juanda International (SUB) at -7.38, 112.79. The model covers a grid about 50 km across, so a coastal or hilly spot can run a degree or two different. Retrieved 12 September 2026.
The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center (LaRC) Prediction of Worldwide Energy Resource (POWER) Project funded through the NASA Earth Science/Applied Science Program.