Shouldn't be surprising after this hot summer, but I saw another one, this one up in Carlsbad. I've been seeing them all around 630pm on sandy/dusty sections of trail adjacent to grassy areas.
Have you seen one too? Add your encounter to the rattlesnake map! (Below.) Plus it's always available at right if you click on the snake.
View Rattlesnake Encounters in San Diego County in a larger map