Temperatures remained appreciably above normal in Gorakhpur, Varanasi, Faizabad, Lucknow, Bareilly, Moradabad and Kanpur divisions, the MET office said.
Varanasi with a maximum of 44.9 degrees celsius was the hottest place in the state followed by Allahabad with 44.8 degrees celsius, Banda with 44.4 degrees celsius and Sultanpur 44 degrees celsius.
The state capital Lucknow also witnessed a hot day with 42.9 degrees celsius.
The MET office said that the heat wave was likely to continue and weather would remain dry all over the state.