Sounds like a good plan. I'm in the same boat. I am just waiting for the temps to moderate a little. I think we are pretty close to 100 degrees today. Supposedly we will receive a cool front this weekend which will moderate the temps into the mid 60's at night and the high 80's in the daytime. Guess I will need a warm jacket while planting my fall garden. I already have my fall tomatoes planted. Will probably buy seed for the other stuff tomorrow.
I am curious about the onions you are planting. The granex is the parent onion of all the super sweets including the Vidalia, Noonday, and Maui sweet. The variety I plant is the Texas A&M 1015, but I can't plant them until February because we do have a few hard freezes here in the winter. If the fall planted onions are exposed to two freezes before spring, they will bolt quickly in the spring to produce seed and probably not produce a bulb. Did you obtain your seed / seedlings from Vidalia, or were you just referencing the similarity between what you are planting and the Vidalia? Most onion varieties are grown for seed or seedlings for specific areas or zones. If you received yours from Vidalia, Georgia; they may not do well in Southern California.