Climate averages 1991–2020
Lahān weather
in September.
A hot, very wet month: the 7th warmest and the 9th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a hot month in Lahān: daytime highs average 29.5°C and nights cool to about 24.0°C. By daytime temperature it is the 7th warmest of the 12 months.
Expect about 239 mm of rain on roughly 23 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 Triyuga (23 km away). In September its highs average 29.4°C, about as warm as Lahān, with 243 mm of rain.
Among the 16 cities listed in Nepal, Lahān ranks 9th of 16 for the warmest September highs and 6th of 16 for the driest September (rainfall, lowest first). The mean September high of those 16 cities is 28.9°C; Lahān is 0.6°C warmer than that mean.
From September to October, average highs fall by 0.7°C to 28.8°C, and monthly rainfall falls from 239 mm to 57 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
Lahān climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 21.4°C10.1°C | 10.1°C | 11 | 1.7 | 10.711 h |
| February | 24.9°C12.5°C | 12.5°C | 12 | 2.1 | 11.211 h |
| March | 30.7°C16.8°C | 16.8°C | 12 | 2.4 | 12.012 h |
| April | 34.1°C21.3°C | 21.3°C | 31 | 5.7 | 12.813 h |
| May | 33.6°C24.0°C | 24.0°C | 97 | 13.6 | 13.413 h |
| June | 31.6°C25.1°C | 25.1°C | 253 | 23.0 | 13.814 h |
| July | 29.9°C25.1°C | 25.1°C | 412 | 27.5 | 13.614 h |
| August | 30.0°C25.1°C | 25.1°C | 279 | 27.2 | 13.113 h |
| September, selected | 29.5°C24.0°C | 24.0°C | 239 | 22.9 | 12.312 h |
| October | 28.8°C20.3°C | 20.3°C | 57 | 6.8 | 11.512 h |
| November | 26.5°C15.3°C | 15.3°C | 3.8 | 0.5 | 10.911 h |
| December | 23.1°C11.6°C | 11.6°C | 4.0 | 0.8 | 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
- Triyuga in SeptemberNepal · 23 kmHigh 29.4°C · Low 24.1°C · 243 mm rain
- Janakpur in SeptemberNepal · 55 kmHigh 30.4°C · Low 24.5°C · 224 mm rain
- Madhubani in SeptemberIndia · 58 kmHigh 30.7°C · Low 24.7°C · 249 mm rain
- Inaruwa in SeptemberNepal · 67 kmHigh 29.4°C · Low 24.1°C · 277 mm rain
- Dharān in SeptemberNepal · 80 kmHigh 28.0°C · Low 23.0°C · 276 mm rain
- Benipur in SeptemberIndia · 81 kmHigh 30.9°C · Low 24.9°C · 256 mm rain
- Biratnagar in SeptemberNepal · 84 kmHigh 30.0°C · Low 24.4°C · 277 mm rain
- Darbhanga in SeptemberIndia · 86 kmHigh 30.8°C · Low 24.8°C · 249 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 Lahān) is explained once on the Lahān year overview and on the Sources, method and limits page.