Batam weather by month
Batam runs from about 26°C in January to 28°C in April, with January the wettest month at 453 mm.
warmest month
April
28°C
coolest month
January
26°C
wettest month
January
453 mm
worst air month
October
21 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 26°C | 453 mm | 239 h | 15 |
| February | 27°C | 113 mm | 311 h | 19 |
| March | 28°C | 100 mm | 333 h | 19 |
| April | 28°C | 226 mm | 298 h | 18 |
| May | 28°C | 334 mm | 293 h | 17 |
| June | 28°C | 238 mm | 279 h | 14 |
| July | 28°C | 116 mm | 315 h | 18 |
| August | 27°C | 194 mm | 304 h | 15 |
| September | 27°C | 261 mm | 288 h | 16 |
| October | 27°C | 195 mm | 300 h | 21 |
| November | 27°C | 422 mm | 261 h | 18 |
| December | 27°C | 175 mm | 285 h | 15 |
About 3,506 hours of sun a year. Roughly 253 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 2026-05-24. Full method, licences and the list of sources we rejected are on the methodology page.