The downpour is likely to aggravate the flood situation in the state which has claimed 56 lives and affected 69.81 lakh people in 13 districts.
While the state weather office forecast generally clear sky with possibility of rain or thundershower in some places, it said, heavy rain was likely to occur at one or two places during the next 24 hours.
Meanwhile, the Met office bulletin said, Patna recorded 19 mm rain from 8.30 am to 5.30 pm today.
While Patna recorded maximum temperature of 30.2 degree celsius today, it was 32.4 degree celsius in Gaya and 35.2 degree celsius in Bhagalpur.