as today was yesterday

  1. Today is sunny, as yesterday was.
  2. Today is sunny, as today was yesterday.
  3. Today is sunny, as it was yesterday.
  4. Today is sunny, as was it yesterday.
  5. Today it is sunny, as it was yesterday.
    Please correct the and comment.
    Thanks.

It is sunny today as it was yesterday.
Today is sunny as was yesterday.

It is sunny today, as it was yesterday. The commas are not incorrect. Perhaps the commas were removed due to confusion over the comparative sentence ‘It is as sunny today as it was yesterday.’
Today is sunny, as was yesterday. Again the commas are not incorrect. A comparative sentence here would be “Today is as sunny as yesterday was.”

Only numbers 2 and 4 in the original set are incorrect.