Officers arrived in the area of Vine Street and Mitchell Lane at about 1:20 am to find a man with multiple gunshot wounds.
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They tried to revive the man but he died at the scene.
Homicide detectives are canvassing the area for evidence and possible surveillance video.
They are looking for a red sedan reported to have been leaving the area at the time.
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If you have any information about the case, you are urged to contact the Atwater Police Department at 209-357-6384 and ask for Detective Sgt Brum or Detective Vargas.
This is Atwater's third homicide of the year, police say.