In terms of precipitation, rainfall in Patna ranges from 0.3 - 12.6 inches per month. July is typically the wettest month, when rainfall can reach 12.6 in. November is typically the driest time to visit Patna when rainfall is around 0.3 in.
If weather is an important factor for your trip to Patna, use this chart to help with planning. For those seeking warmer temperatures, May is the ideal time of year to visit, when temperatures reach an average of 89.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 60.8 F).