Seara este plăcută.

to be

Breakdown of Seara este plăcută.

• seara: the evening
• plăcut: pleasant

Questions & Answers about Seara este plăcută.

Why is it seara and not seară?

Because seara is the definite form of the noun.

• seară = evening / an evening
• seara = the evening

Romanian usually puts the definite article at the end of the noun, not as a separate word like English the.

So:

• o seară = an evening
• seara = the evening

In this sentence, seara is the subject: The evening is pleasant.

Does seara ever mean in the evening?

Yes. That is a very common source of confusion.

Depending on context, seara can mean:

• the evening as a noun
• in the evening / evenings as a time expression

For example:

• Seara este plăcută. = The evening is pleasant.
  Here, seara is clearly the subject.

• Lucrez seara. = I work in the evening / evenings.
  Here, seara functions more like a time expression.

So in your sentence, it is a noun, not an adverbial expression.

What is doing here?