I'm currently sitting on my parents' back porch and it distinctly smells like summer out here. It's heavenly.
The smell of smoke from a charcoal grill mixed with the scent of citronella from a candle to keep the bugs at bay is wafting through the air. It brings back so many memories of summer BBQs at my grandparents' house.
Other favorite summer smells of mine would be fresh cut grass, burnt marshmallows around a campfire, and suncreen mixed with bug spray. Oh and don't forget wet dog. That's another popular one around these parts.
To me it just wouldn't be summer if I didn't smell certain things. We're going to the beach in a week and I'm looking forward to smelling the ocean.