San Francisco
...as someone who has lived the last 15 years in Phoenix/Scottsdale, AZ, and spent every summer there, I can tell you that you just get used to it. In fact, as a person who needs the sunshine, the more I get, the more I want -- the sunshine, as well. Yes, A/C helps, as do swimming pools, being out on the patio with the misters going (light sprays of finely "misted" water, not additional guys), plenty of cool water -- all help in the pursuit of playtime.
Once the winter comes and sunshine isn't quite as intense, my levels do drop a bit -- but not too much! 
...as someone who has lived the last 15 years in Phoenix/Scottsdale, AZ, and spent every summer there, I can tell you that you just get used to it. In fact, as a person who needs the sunshine, the more I get, the more I want -- the sunshine, as well. Yes, A/C helps, as do swimming pools, being out on the patio with the misters going (light sprays of finely "misted" water, not additional guys), plenty of cool water -- all help in the pursuit of playtime.
Once the winter comes and sunshine isn't quite as intense, my levels do drop a bit -- but not too much!