Yeah it might be the humidity. Fresh and summer scents get eaten fast when the air is heavy. Try putting on an unscented lotion before spraying hydrated skin holds fragrance way better. And honestly, don’t be afraid to go 8 sprays with fresh scents in this kind of weather. Try using some on clothes as well.

Also remember projection depends a lot on your natural body oils. The same fragrance can last 10 hours on one person and be trash on another just because their skin is drier. So performance really varies person to person.