嵐の時はどんな港でもよい。

。

Any port in a storm.

Literal

Storm [possessive-の] time [topic-は] any port [even-でも] good.

嵐の時はどんな港でもよい is the Japanese rendering of 'any port in a storm' — when in trouble, any refuge will do. どんな~でも (any/whatever kind of) creates universal scope.