Difference between 〜といい and 〜ように for “I hope...”


I've learned that both of these can be used to mean “I hope that...” or “I
wish that...” but what is the difference in meaning?

> 「明日晴れといいな。」vs 「明日晴れように。」

Do these have the same meaning?




The first phrase translates literally as "if tomorrow is clear, (I think) that
will be good."

The second phrase is a sort of ambiguous shortening of ～ように願｛ねが｝っています, "I am
hoping for ~" or similar ending.

Similar to a lot of Japanese phrasings, when you are talking about yourself
(or implying) then emphasis is on a much more personal, closely held
belief/feeling/want. However the first is simply stating a logical fact that
is probably shared by many people.

I think in this case the first one would be more appropriate in a casual, "I
simply want the weather tomorrow to be nice for us all". But if there's
something personaly important that is dependent on the weather tomorrow (eg. a
sports game, a vacation), the second phrasing might be more appropriately
emotional.

