Wash the cucumbers thoroughly under cold water.
Peel the cucumbers if desired, then slice them thinly.
Place the sliced cucumbers in a large mixing bowl.
In a separate bowl, combine the yogurt, mayonnaise, and lemon juice.
Add garlic powder, salt, and pepper to the dressing mixture.
Stir the dressing until smooth and well combined.
Pour the dressing over the cucumbers in the mixing bowl.
Toss the cucumbers gently to coat them evenly with the dressing.
Add fresh dill, cherry tomatoes, and radishes to the salad.
Serve immediately or chill for 30 minutes before serving for enhanced flavor.