Gangtok weather by month
Gangtok runs from about 7°C in January to 21°C in July, with July the wettest month at 681 mm.
warmest month
July
21°C
coolest month
January
7°C
wettest month
July
681 mm
worst air month
February
44 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 7°C | 74 mm | 298 h | 41 |
| February | 9°C | 110 mm | 286 h | 44 |
| March | 12°C | 165 mm | 314 h | 38 |
| April | 16°C | 85 mm | 352 h | 28 |
| May | 18°C | 253 mm | 337 h | 19 |
| June | 20°C | 568 mm | 277 h | 16 |
| July | 21°C | 681 mm | 184 h | 9 |
| August | 20°C | 334 mm | 228 h | 7 |
| September | 20°C | 360 mm | 261 h | 9 |
| October | 17°C | 240 mm | 323 h | 15 |
| November | 13°C | 71 mm | 299 h | 21 |
| December | 10°C | 48 mm | 303 h | 29 |
About 3,462 hours of sun a year. Roughly 225 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 2026-05-25. Full method, licences and the list of sources we rejected are on the methodology page.