The weather can change its mind on a moment’s notice. If possible, go sightseeing in the U.K. between May and September to see the U.K. at its loveliest. Septembers are balmy and offer a gentle introduction for Study Abroad students.
Winters can be on the mild side though gray and rainy. Spring Break here is certainly doable, too.
Be sure to travel to Edinburgh in August for festivals of all kinds. Just plan ahead because the city’s festival period will be in full throttle and cheap hotels in Edinburgh may be harder to come by.