Peel and chop the cucumbers. Remove the pits and scoop out the avocado flesh. Mince the garlic and juice the lime.
In a high-speed blender or food processor, combine the cucumbers, avocado, garlic, lime juice, olive oil, and Greek yogurt. Blend until smooth and creamy.
Add the chopped dill, cilantro, salt, and black pepper. Blend again until everything is fully incorporated. Taste and adjust the salt, lime, or herbs as needed.
Add cold water gradually while blending until the soup reaches your preferred thickness. For a thinner soup, use more water.
Transfer the soup to a bowl or airtight container and chill in the refrigerator for at least 1 hour. This helps the flavors meld beautifully.
Serve in bowls and garnish with your favorite toppings—extra cucumber, radish slices, a swirl of yogurt, or a handful of fresh herbs. Enjoy immediately while cold!