We were there last July and the weather is hot. Being from Texas, we are used to it. It rained a couple of times late in the afternoon or evening. The quick storms were nice and cooled things off. No problems with bugs or mosquitos.
July is hot and calm--the ocean is sometimes just flat inside the reef, great for snorkeling. I usually stay 'in-town', didn't use bug spray, used panty-rippers and Beliken, so if I was getting bitten I didn't know it anyway.
We went July 4th last year, Didn't seem as hot as Texas so we're going again this year ... Rained briefly two days ..Bugs were not a problem except when we went way south(we stayed at Mata Rocks,so way south of there) ,Also we had a few up north of Palapa...Also rained real hard the day we we fishing but we still had a wonderful trip!!!!!!! John
went in mid-July last year & the weather was perfect every single day...someone did say that it had been raining the week before, tho, but nothing more than a few showers...i had no problems w/any bugs at all, but did stay in town & did stay pretty well intoxicated...maybe they didn't like the taste of my blood?!