Bihar weather in September
September is a fair month to visit Bihar: highs of 31°C (88°F) and about 181 mm (7.1 in) of rain on average. Nights average 25°C (76°F) and cloud cover 65% (NASA POWER, 2001–2025 averages). It is the 3rd wettest month of the year and the 6th coolest. Compared with August, it is cooler and drier; October brings highs of 31°C (87°F) and 51 mm (2.0 in) of rain.
Figures are long-term averages for Patna, the largest city in Bihar. See below for other places.
Is September a good time to visit Bihar?
fair month Weather score 56/100.
September is a fair month in Bihar. The weather is usually best in Oct–Mar.
Does it rain a lot in Bihar in September?
Yes, it is one of the rainy months: about 181 mm (7.1 in) falls in an average September. It is the 3rd wettest month of the year.
How warm is Bihar in September?
Days average 31°C (88°F) and nights 25°C (76°F).
Bihar weather by month
| Month | High | Low | Rain | Cloud | Weather |
|---|---|---|---|---|---|
| January | 23°C (74°F) | 8°C (46°F) | 11 mm | 32% | best |
| February | 28°C (83°F) | 12°C (53°F) | 14 mm | 25% | best |
| March | 35°C (95°F) | 18°C (64°F) | 9 mm | 24% | best |
| April | 41°C (105°F) | 24°C (75°F) | 14 mm | 29% | fair |
| May | 42°C (108°F) | 28°C (82°F) | 50 mm | 41% | least pleasant |
| June | 40°C (103°F) | 30°C (85°F) | 152 mm | 66% | least pleasant |
| July | 34°C (93°F) | 27°C (80°F) | 276 mm | 82% | least pleasant |
| August | 32°C (90°F) | 26°C (79°F) | 233 mm | 77% | least pleasant |
| September | 31°C (88°F) | 25°C (76°F) | 181 mm | 65% | fair |
| October | 31°C (87°F) | 20°C (69°F) | 51 mm | 28% | best |
| November | 27°C (81°F) | 14°C (58°F) | 2 mm | 14% | best |
| December | 24°C (74°F) | 10°C (49°F) | 3 mm | 25% | best |
Sources: 2001–2025 monthly averages from NASA POWER (MERRA-2 reanalysis). Page updated . How we rate months
Weather across Bihar in September
Weather can differ a lot within Bihar: coasts, hills and mountains each have their own climate.
| Place | High | Low | Rain | Weather |
|---|---|---|---|---|
| Patna | 31°C (88°F) | 25°C (76°F) | 181 mm | fair |
| Gaya | 31°C (88°F) | 25°C (76°F) | 181 mm | fair |
| Bhāgalpur | 31°C (87°F) | 25°C (76°F) | 203 mm | fair |
| Muzaffarpur | 32°C (89°F) | 25°C (76°F) | 196 mm | fair |
| Bihār Sharīf | 31°C (88°F) | 24°C (76°F) | 184 mm | fair |
| Darbhanga | 32°C (89°F) | 25°C (76°F) | 196 mm | fair |
| Purnia | 31°C (87°F) | 25°C (76°F) | 236 mm | least pleasant |
| Arrah | 31°C (89°F) | 25°C (76°F) | 173 mm | fair |
| Begusarai | 31°C (88°F) | 25°C (77°F) | 194 mm | fair |
| Katihar | 31°C (87°F) | 25°C (77°F) | 220 mm | fair |
| Munger | 31°C (88°F) | 25°C (77°F) | 194 mm | fair |
| Chāpra | 32°C (89°F) | 25°C (76°F) | 187 mm | fair |