Climate averages 1991–2020
Purnia 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 Purnia: daytime highs average 30.6°C and nights cool to about 24.8°C. By daytime temperature it is the 7th warmest of the 12 months.
Expect about 295 mm of rain on roughly 25 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 Katihar (28 km away). In September its highs average 30.8°C, about as warm as Purnia, with 254 mm of rain.
Among the 692 cities listed in India, Purnia ranks joint 391st of 692 for the warmest September highs and joint 669th of 692 for the driest September (rainfall, lowest first). The mean September high of those 692 cities is 30.7°C; Purnia is level with that mean.
From September to October, average highs fall by 0.8°C to 29.8°C, and monthly rainfall falls from 295 mm to 101 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
Purnia climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 22.7°C11.3°C | 11.3°C | 12 | 1.9 | 10.711 h |
| February | 26.1°C13.8°C | 13.8°C | 17 | 2.2 | 11.311 h |
| March | 31.8°C18.8°C | 18.8°C | 20 | 3.0 | 12.012 h |
| April | 34.6°C22.6°C | 22.6°C | 50 | 7.4 | 12.813 h |
| May | 33.3°C24.2°C | 24.2°C | 160 | 16.3 | 13.413 h |
| June | 31.9°C25.3°C | 25.3°C | 315 | 23.8 | 13.714 h |
| July | 31.2°C25.7°C | 25.7°C | 375 | 29.1 | 13.614 h |
| August | 31.3°C25.7°C | 25.7°C | 338 | 28.6 | 13.013 h |
| September, selected | 30.6°C24.8°C | 24.8°C | 295 | 24.8 | 12.312 h |
| October | 29.8°C21.8°C | 21.8°C | 101 | 9.6 | 11.612 h |
| November | 27.8°C16.9°C | 16.9°C | 5.7 | 0.6 | 10.911 h |
| December | 24.5°C12.9°C | 12.9°C | 5.9 | 0.7 | 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
- Katihar in SeptemberIndia · 28 kmHigh 30.8°C · Low 25.1°C · 254 mm rain
- Arāria in SeptemberIndia · 41 kmHigh 30.5°C · Low 24.6°C · 358 mm rain
- Kishanganj in SeptemberIndia · 60 kmHigh 30.4°C · Low 24.7°C · 309 mm rain
- Sāhibganj in SeptemberIndia · 62 kmHigh 30.7°C · Low 25.3°C · 265 mm rain
- Rāiganj in SeptemberIndia · 68 kmHigh 30.7°C · Low 24.9°C · 286 mm rain
- Biratnagar in SeptemberNepal · 78 kmHigh 30.0°C · Low 24.4°C · 277 mm rain
- Bhāgalpur in SeptemberIndia · 78 kmHigh 30.8°C · Low 25.0°C · 234 mm rain
- Saharsa in SeptemberIndia · 89 kmHigh 30.7°C · Low 24.9°C · 244 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 Purnia) is explained once on the Purnia year overview and on the Sources, method and limits page.