Yes, here it indicates exclamation. But note that this usage of 了 almost only occur in syntaxes like 太……了 or 最……了. And for the latter, the Subject is usually some person rather than something.
It is possible, though, to hear people say things like 春天最暖和了 or 蚊子最讨厌了 (where the Subject is non-human). But be careful with such structure, because they might appear too emotional in some context.