Answer:
The weather is pleasanter today then it was yesterday.
Step-by-step explanation:
An adjective is a word that modifies or describe a noun or pronoun in the sentence. Adjectives can be in different forms like comparative and superlative degrees of adjectives.
In the given sentence, the comparison is between the weather of today and yesterday, making it a comparison between two things/ days. Thus, the adjective used will be that of the comparative adjective of pleasant. So, the final sentence will be -
The weather is pleasanter today than it was yesterday.