回答
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The end of the rainy season this year seems to be later than usual.
「今年の梅雨明けは例年より遅いらしい」は英語で「The end of the rainy season this year seems to be later than usual.」という表現が良いと思います。
今年ーThis year
梅雨明けーEnd of the rainy season
例年ーAverage year・Normal・Usual
例年よりーThan normal・Than usual
遅いーLate
らしいーSeems to・Looks like・Appears