As hot as it gets in Sacramento , it may be tough to find a good 'Keeper' apple. You might try Granny Smith or Mutsu. Need late ripening and heat tolerant sorts.
May help to overhead sprinkle the trees when it gets above 95 in the worst part of summer too, but doubt you will have the water to spare by then.

Carla:

I can't give you any kind of exhaustive list; that would call for some research. But, in general, the apples that keep best through the winter are the latest to ripen. They are the harder, dense apples, and usually on the sweet side, though you could also call it a sweet/tart flavor.

Of the 40 varieties I have grown here, the best keepers have been Fuji, Stark's Blushing Golden (very similar to Goldrush), Goldrush itself, and the very late Pink Lady.

None of the midseason apples come even close to the keeping qualities of the really late varieties, though some of the late-midseason like Mutsu and Spigold do pretty well. For the early apples like Yellow Transparent, we figure about three weeks before they have to be turned into frozen applesauce and then they will keep more than a year.

I don't know how your heat could be a factor in apple growing, but have noticed that Applenut seems to be able to grow just about anything in his very warm climate. Here in Northern Virginia, we can get into the mid-90's for several days running in July and August, but it's not Sacramento by any means.

Don Yellman, Great Falls, VA