明天是晴天，很熱。

Tomorrow will be a sunny day, and very hot.

Source: Tatoeba

Sentence Composition

1 明天 míngtiān tomorrow
=2 是 shì
  1. to be (followed by substantives only)
  2. correct; right; true
  3. (respectful acknowledgement of a command) very well
  4. (adverb for emphatic assertion)
=2 是 shì variant of 是 shì
3 晴天 qíngtiān
  1. clear sky
  2. sunny day
4 很 hěn
  1. very; quite
  2. (also, often used before an adjective without intensifying its meaning, i.e. as a meaningless syntactic element)
5 熱 rè
  1. to warm up
  2. to heat up
  3. hot (of weather)
  4. heat
  5. fervent