Climate averages 1991–2020
Gangtok weather
in September.
A mild, very wet month: the 4th warmest and the 9th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a mild month in Gangtok: daytime highs average 20.5°C and nights cool to about 15.2°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 508 mm of rain on roughly 28 days, which makes September a very wet month (the 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 20 min on an average September day.
The nearest other city in this atlas is Dārjiling (47 km away). In September its highs average 19.7°C, 0.7°C cooler than Gangtok, with 416 mm of rain.
Among the 692 cities listed in India, Gangtok ranks joint 689th of 692 for the warmest September highs and 692nd of 692 for the driest September (rainfall, lowest first). The mean September high of those 692 cities is 30.7°C; Gangtok is 10.2°C cooler than that mean.
From September to October, average highs fall by 1.8°C to 18.6°C, and monthly rainfall falls from 508 mm to 216 mm.
The annual picture
September in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Gangtok climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 10.9°C3.5°C | 3.5°C | 253 | 25.6 | 10.611 h |
| February | 12.3°C4.2°C | 4.2°C | 269 | 24.7 | 11.211 h |
| March | 16.1°C6.8°C | 6.8°C | 252 | 26.4 | 12.012 h |
| April | 18.9°C9.6°C | 9.6°C | 211 | 24.6 | 12.813 h |
| May | 20.2°C13.0°C | 13.0°C | 283 | 29.4 | 13.513 h |
| June | 21.2°C15.9°C | 15.9°C | 605 | 29.5 | 13.814 h |
| July | 21.0°C16.3°C | 16.3°C | 1,126 | 31.0 | 13.714 h |
| August | 21.2°C16.1°C | 16.1°C | 908 | 30.8 | 13.113 h |
| September, selected | 20.5°C15.2°C | 15.2°C | 508 | 28.4 | 12.312 h |
| October | 18.6°C12.3°C | 12.3°C | 216 | 23.0 | 11.512 h |
| November | 15.2°C8.6°C | 8.6°C | 181 | 21.0 | 10.811 h |
| December | 12.4°C5.9°C | 5.9°C | 173 | 22.8 | 10.510 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Dārjiling in SeptemberIndia · 47 kmHigh 19.7°C · Low 14.5°C · 416 mm rain
- Siliguri in SeptemberIndia · 71 kmHigh 29.0°C · Low 23.5°C · 411 mm rain
- Jalpāiguri in SeptemberIndia · 91 kmHigh 29.7°C · Low 24.2°C · 468 mm rain
- Jaigaon in SeptemberIndia · 92 kmHigh 27.8°C · Low 23.6°C · 418 mm rain
- Thimphu in SeptemberBhutan · 103 kmHigh 18.6°C · Low 12.1°C · 255 mm rain
- Koch Bihār in SeptemberIndia · 139 kmHigh 30.2°C · Low 24.6°C · 460 mm rain
- Dharān in SeptemberNepal · 144 kmHigh 28.0°C · Low 23.0°C · 276 mm rain
- Thākurgaon in SeptemberBangladesh · 145 kmHigh 30.3°C · Low 24.6°C · 310 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Gangtok) is explained once on the Gangtok year overview and on the Sources, method and limits page.