Evanier's fearless weather forecast for Comic-Con International…
Clear and sunny. Daytime temps between 70° and 75°. Nighttime temps between 68° and 70°.
For those of you who still think the con should move to Las Vegas, it'll be 108° to 115° there at the same time with nighttime lows in the nineties. (Just for reference: In Vegas, 114° is the temperature at which the strippers' chests all melt. Even the male ones.)