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It has not rained today as yesterday.
Is this sentence is correct?
Comments  
It is not completely convincing as idiomatic English.

Here's some ways that are better:

It has not rained today, but it rained yesterday.

It has not rained as much today as it did yesterday.

The two do not mean exactly the same thing, however, so you will have to decide which one is the one you want to say.

Emotion: smile
The original message MIGHT be 'It didn't rain yesterday and it hasn't rained today either'. Would you agree?
Teachers: We supply a list of EFL job vacancies
I agree completely. Language consistently underspecifies reality!
But in that case, how can you express it succinctly?
Is this correct:

'It hasn't rained today, just like yesterday.' ?
But in that case, how can you express it succinctly?
Is this correct:

'It hasn't rained today, just like yesterday.' ?
Students: Are you brave enough to let our tutors analyse your pronunciation?
"It hasn't rained today, just like yesterday" is completely correct, yes.
"It hasn't rained for two days" is another possibility!