Kolkata weather by month
Kolkata runs from about 18°C in January to 31°C in April, with August the wettest month at 613 mm.
warmest month
April
31°C
coolest month
January
18°C
wettest month
August
613 mm
worst air month
January
131 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 18°C | 44 mm | 281 h | 131 |
| February | 22°C | 19 mm | 293 h | 96 |
| March | 26°C | 62 mm | 304 h | 45 |
| April | 31°C | 24 mm | 325 h | 31 |
| May | 30°C | 234 mm | 311 h | 34 |
| June | 31°C | 136 mm | 284 h | 46 |
| July | 29°C | 346 mm | 277 h | 22 |
| August | 28°C | 613 mm | 190 h | 19 |
| September | 28°C | 328 mm | 246 h | 23 |
| October | 27°C | 261 mm | 262 h | 55 |
| November | 24°C | 3 mm | 294 h | 100 |
| December | 21°C | 13 mm | 281 h | 128 |
About 3,348 hours of sun a year. Roughly 168 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.