Climate averages 1991–2020
Shillong weather
in September.
A warm, very wet month: the 4th warmest and the 8th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a warm month in Shillong: daytime highs average 23.0°C and nights cool to about 18.0°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 393 mm of rain on roughly 29 days, which makes September a very wet month (the 8th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 19 min on an average September day.
The nearest other city in this atlas is Guwahati (70 km away). In September its highs average 30.3°C, 7.3°C warmer than Shillong, with 392 mm of rain.
Among the 692 cities listed in India, Shillong ranks 686th of 692 for the warmest September highs and 686th of 692 for the driest September (rainfall, lowest first). The mean September high of those 692 cities is 30.7°C; Shillong is 7.7°C cooler than that mean.
From September to October, average highs fall by 1.3°C to 21.7°C, and monthly rainfall falls from 393 mm to 224 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
Shillong climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 15.7°C6.8°C | 6.8°C | 22 | 4.4 | 10.711 h |
| February | 17.6°C8.3°C | 8.3°C | 43 | 7.7 | 11.311 h |
| March | 20.6°C11.3°C | 11.3°C | 119 | 15.9 | 12.012 h |
| April | 22.0°C14.2°C | 14.2°C | 275 | 25.9 | 12.713 h |
| May | 22.8°C16.5°C | 16.5°C | 453 | 30.1 | 13.413 h |
| June | 23.5°C18.6°C | 18.6°C | 697 | 29.8 | 13.714 h |
| July | 23.5°C19.1°C | 19.1°C | 715 | 31.0 | 13.614 h |
| August | 23.5°C18.9°C | 18.9°C | 558 | 30.9 | 13.013 h |
| September, selected | 23.0°C18.0°C | 18.0°C | 393 | 28.8 | 12.312 h |
| October | 21.7°C15.3°C | 15.3°C | 224 | 20.2 | 11.612 h |
| November | 19.3°C11.5°C | 11.5°C | 47 | 6.6 | 10.911 h |
| December | 16.9°C8.5°C | 8.5°C | 16 | 2.6 | 10.611 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
- Guwahati in SeptemberIndia · 70 kmHigh 30.3°C · Low 24.6°C · 392 mm rain
- Sunāmganj in SeptemberBangladesh · 74 kmHigh 29.2°C · Low 23.9°C · 521 mm rain
- Sylhet in SeptemberBangladesh · 74 kmHigh 30.1°C · Low 24.5°C · 523 mm rain
- Nagaon in SeptemberIndia · 117 kmHigh 30.6°C · Low 24.9°C · 344 mm rain
- Silchar in SeptemberIndia · 124 kmHigh 30.1°C · Low 24.4°C · 293 mm rain
- Netrakona in SeptemberBangladesh · 139 kmHigh 30.6°C · Low 24.7°C · 333 mm rain
- Habiganj in SeptemberBangladesh · 140 kmHigh 30.8°C · Low 24.8°C · 313 mm rain
- Tezpur in SeptemberIndia · 150 kmHigh 29.9°C · Low 24.7°C · 332 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 Shillong) is explained once on the Shillong year overview and on the Sources, method and limits page.