Surabaya weather by month
Surabaya runs from about 27°C in February to 30°C in October, with December the wettest month at 426 mm.
warmest month
October
30°C
coolest month
February
27°C
wettest month
December
426 mm
worst air month
November
78 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 27°C | 340 mm | 280 h | 37 |
| February | 27°C | 391 mm | 269 h | 37 |
| March | 27°C | 239 mm | 271 h | 44 |
| April | 28°C | 225 mm | 279 h | 33 |
| May | 29°C | 6 mm | 341 h | 41 |
| June | 29°C | 34 mm | 327 h | 28 |
| July | 28°C | 7 mm | 334 h | 33 |
| August | 28°C | 4 mm | 341 h | 34 |
| September | 29°C | 11 mm | 337 h | 35 |
| October | 30°C | 20 mm | 363 h | 52 |
| November | 28°C | 284 mm | 328 h | 78 |
| December | 27°C | 426 mm | 233 h | 58 |
About 3,703 hours of sun a year. Roughly 173 rainy days a year.
These are long-run climate normals, not a forecast. A given year can sit well outside them. PM2.5 is a global model: near the coast it counts sea salt as fine particulate and reads high against ground stations, sometimes by a factor of two. Use the shape of the year, not the absolute number.
where these numbers come from
- · Temperature, rainfall and sunshine: ECMWF ERA5 reanalysis climate normals via Open-Meteo (CC BY 4.0), fetched once and stored.
- · PM2.5: Copernicus CAMS reanalysis, monthly means. Modelled, not station readings; near coasts CAMS counts sea salt as PM2.5 and reads high.
Last reviewed 2026-05-23. Full method, licences and the list of sources we rejected are on the methodology page.