Climate averages 1991–2020
Birgañj 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 Birgañj: daytime highs average 30.5°C and nights cool to about 24.5°C. By daytime temperature it is the 7th warmest of the 12 months.
Expect about 225 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 Mothīhāri (41 km away). In September its highs average 30.8°C, about as warm as Birgañj, with 292 mm of rain.
Among the 16 cities listed in Nepal, Birgañj ranks joint 1st of 16 for the warmest September highs and 5th of 16 for the driest September (rainfall, lowest first). The mean September high of those 16 cities is 28.9°C; Birgañj is 1.6°C warmer than that mean.
From September to October, average highs fall by 0.7°C to 29.8°C, and monthly rainfall falls from 225 mm to 45 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
Birgañj climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 21.7°C10.2°C | 10.2°C | 13 | 1.8 | 10.611 h |
| February | 25.3°C12.6°C | 12.6°C | 17 | 2.1 | 11.211 h |
| March | 31.3°C17.0°C | 17.0°C | 12 | 2.1 | 12.012 h |
| April | 35.7°C21.9°C | 21.9°C | 26 | 5.2 | 12.813 h |
| May | 35.6°C24.9°C | 24.9°C | 76 | 11.4 | 13.513 h |
| June | 33.8°C26.1°C | 26.1°C | 226 | 20.5 | 13.814 h |
| July | 31.1°C25.7°C | 25.7°C | 441 | 28.6 | 13.714 h |
| August | 31.0°C25.6°C | 25.6°C | 347 | 28.1 | 13.113 h |
| September, selected | 30.5°C24.5°C | 24.5°C | 225 | 22.7 | 12.312 h |
| October | 29.8°C20.7°C | 20.7°C | 45 | 5.1 | 11.512 h |
| November | 27.4°C15.7°C | 15.7°C | 4.7 | 0.5 | 10.811 h |
| December | 23.5°C11.7°C | 11.7°C | 7.1 | 0.7 | 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
- Mothīhāri in SeptemberIndia · 41 kmHigh 30.8°C · Low 24.9°C · 292 mm rain
- Bettiah in SeptemberIndia · 44 kmHigh 30.8°C · Low 24.8°C · 237 mm rain
- Hetauda in SeptemberNepal · 48 kmHigh 28.1°C · Low 22.8°C · 252 mm rain
- Bagaha (Bihar, 27.10°N 84.09°E), India in SeptemberIndia · 79 kmHigh 30.6°C · Low 24.7°C · 239 mm rain
- Bharatpur, Nepal in SeptemberNepal · 86 kmHigh 29.7°C · Low 24.0°C · 305 mm rain
- Madhyapur Thimi in SeptemberNepal · 89 kmHigh 24.6°C · Low 18.8°C · 304 mm rain
- Siwān in SeptemberIndia · 103 kmHigh 30.9°C · Low 25.0°C · 205 mm rain
- Kushinagar in SeptemberIndia · 103 kmHigh 30.8°C · Low 24.8°C · 213 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 Birgañj) is explained once on the Birgañj year overview and on the Sources, method and limits page.