By DENNIS WYATT The Bulletin Temperatures are running 5 degrees warmer in the San Joaquin River at Vernalis 10 miles southwest of Manteca due to low water flows. This isn’t good news for the Chinook salmon that are struggling to survive in the face of non-native predators in the Delta as well as the continuing California drought. United States Geological Survey data shows temperatures reached 84 degrees on June 30 and then pushed 86 degrees July 6-8 before dropping to 82.5 degrees on July 12.