Prepare the ingredients by cutting the watermelon into manageable chunks and removing any seeds if present. Juice the lime until you have about 2 tablespoons of fresh lime juice.
4 cups watermelon chunks, 1 lime lime juice
Place the watermelon chunks into the blender. Add the freshly squeezed lime juice and torn basil leaves.
4 cups watermelon chunks, 1 lime lime juice, 4 basil leaves fresh basil
Secure the lid on the blender and blend on high speed until the mixture is completely smooth and vibrant pink, about 30-45 seconds. Observe the texture; it should be pulp-free and frothy.
Stop the blender and taste the smoothie. Adjust acidity if desired by adding a small squeeze more lime, then briefly pulse to combine.
Pour the smoothie into glasses. Optionally, garnish with a small basil leaf or a lime wedge for presentation.
Serve immediately while chilled for a refreshing summertime beverage.
