July is an excellent month to go to Disneyland. It's my preferred month having gone for over 30 years during this, and other, times of year. The weather in SoCal is milder in July than Aug-Oct. The weather is actually hotter in the early fall in coastal CA than the early summer. This is caused, in part, by the temperature difference between the cool ocean waters and the hot interior deserts/valleys of CA which causes "fog" or the "marine layer" in the early parts of summer. The ocean temperatures warm during July and the marine layer typically starts to become less prevalent in July and certainly much less so by August. What this means in practice is that the early morning cloud cover during the earlier parts of summer moderates temperatures - often keeping them in the 70's and 80's for highs. This doesn't mean there won't be hot days, or that it can't vary, but this is a typical pattern in SoCal - fog early in the summer with milder temperatures, with hotter temps in later summer/early fall (this has been a pattern for a long time, not just recently). Also, the humidity in SoCal is nothing like the eastern part of the US or Florida. Some on here will tell you it is "humid" at times in Anaheim, which might be true by CA standards, but it is nothing like the southern, eastern, or midwestern US during mid-summer. Overall, SoCal has a "dry" type of heat in comparison to Orlando. One other positive attribute about July is that rain is very rare to non-existent. Last year, Anaheim had a bizarre series of events where remnants of a hurricane passed through in August and some other tropical showers in September; however, most of the time you can count on no rain during the middle of summer (I believe this was only the second time a tropical system passed through SoCal in the past 100 years). Not having to worry about rain makes planning a lot easier.
But I just napped during afternoon and closed the parks instead.
