The incidents occurred in Krishna, Guntur, East Godavari, Prakasam and Nellore districts.
Chief Minister N Chandrababu Naidu has announced ex-gratia of Rs 4 lakh to each of the victim killed in lightning while interacting with district collectors through a tele-conference in Vijaywada.
Six persons were killed in Prakasam district, five in Nellore district, four in Krishna district, two each in Guntur and East Godavari districts.
In Prakasam district, six persons, including three women, were killed while four others were injured when they were struck by lightning in separate incidents.
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Another victim, a borewell operator, died in Vemulkota village, added Markapur sub-inspector of police A. Venkateswarlu.
In Nellore district, five people died after they were struck by lightning, SP Gajarao Bhupal told PTI.
His deputy Tirumaleshwar Reddy said the deceased included a father-son duo who were struck by bolt in Venkatachalam mandal under Nellore rural sub-division.
They are identified as Siva (24), Sarojini (35), Giri (55) and Gunju Jangalu (38).
In Guntur district, two persons died after they were struck by the bolt while working in agricultural field.
They are identified as Bandaru Ananda Rao (54) and Rambabu (46).
In Guntur, women cricketers of Andhra Pradesh and Tripura had a miraculous escape when lightning struck ACA stadium in afternoon where they were playing a match.
The cricketers rushed out from the ground and took shelter in the ACA Academy building. A tree outside the building caught fire after it was hit by bolt.