What does "atsukunatte" mean?
The translation said "too hot", but shouldn't that be "atsusugimasu"? Last time I heard "-kunatte" was in "osokunatte sumimasen", which is an apology for being late. Do "-kunatte" and "-sugimasu" have different meanings?

Question

Answer

It's the TE-form of the verb, in this case, the dictionary form is ATSUKU NARU. Though we know the sentence would be continued, for example, ATSUKU NATTE KIMASHITA (it's getting hot), I need the whole sentence if you have. Anyway, ATSUKU NATTE doesn't mean "TOO HOT", as you said, it's "ATSUSUGIRU / ATSUSUGIMASU".

*about the TE-form, please take a look this page:
http://japanese.about.com/od/grammarlessons/a/031101c.htm

I hope this was helpful.

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