Translation:It is too hot here!
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It's so hot here!
should also be accepted.
It should be noted that 太 + ... + 了 translates to both 'too' and 'so'. Usually, it translates to 'too' when '...' has a negative meaning and to 'so' when '...' has a positive meaning. As it is extensively illustrated here.
In this sentence, which is taken out of context, it is completely ambiguous on whether or not 熱 has a negative meaning for the speaker.