Creamy Cucumber Pasta Salad

1 long english cucumber, sliced or diced thin.
1/2 lb. twisted, penne, or bowtie pasta, cooked and drained
1/2 lb. grape tomatoes, quartered
1/2 sweet onion, sliced thinly, I like to grate it. It gives a unique flavor to the salad
1/2 c. sour cream
1/2 c. mayonnaise
1 teas. sugar
1/2 teas. salt
1/8 teas. pepper
2 tbsp. dill
2 tbsp. white vinegar
dash garlic powder.

Toss all ingredients in a bowl and let sit in the refrigerator at least 40 minutes before serving.