Seafood/salad
Seafood and salad are often considered typical summer foods. For the former, this is not 100% true. Shrimp is best in winter, it is said, and according to an old saying, you shouldn't eat cod in months without an r in the name (i.e. not from May to August).
That said, light seafood tastes great in the summer heat, and a fresh summer salad is both in season and a safe choice for a tasty summer meal.
Beer recommendations
Saison
Wheat beer
Light Belgian beer
Bitter
Pilsner
Pale Ale
Fruit beer
Alcohol-free beer