In a large saucepan, cover the wheat berries with water and bring to a boil. Cover the saucepan and simmer over low heat until the wheat berries are tender but still chewy, about 45 minutes. Drain well and let stand until cool.
In a large bowl, toss the wheat berries with the cucumber, tomatoes, feta cheese, scallion, olive oil, lemon juice and dill. Season with salt and pepper and serve.