Summer in Nagoya is so hot I always change clothes two or three times a day.
Literal
Nagoya [topic-は] summer very hot [because-ので], always 1-day [to-に] 2, 3 times [topic-は] clothes [object-を] change [polite-ます].
Double-subject construction: 名古屋は (topic) + 夏 (nested subject) + 暑い. The に after 1日 marks the distribution unit ('per day') — a frequency-over-time particle. 服を取り替える = 'change clothes.' Nagoya's summer heat is a well-known regional complaint.