Warmer weather with humidity usually does bring out nasty things, We have never seen those gnat things and we go every October, We were wondering the same thing about some flying insects that we encountered two years ago in June. The best description was they were half fly, half mosquito , (We named them Flasquitos) that was in Las Conchas , the same day we talked to someone that had been on Sandy Beach and said there were none there. They were only there for a day but all day and would bite but didn't leave an itch or welt (Thank Goodness!) I am scared to hear about bugs in October since that is when our wedding is next year, we purposely picked that month since its starting to cool off but still warm enough to enjoy the ocean. No one can not control nature , I'm hoping both of these things are rare occurrences as it seems each of these things were there for one day only.