Wilgotność jest wysoka.

to be

Breakdown of Wilgotność jest wysoka.

• wysoki: high
• wilgotność: the humidity

Questions & Answers about Wilgotność jest wysoka.

Why is jest included here? Can Polish leave out is like Russian sometimes does?

In a normal present-tense sentence like this, Polish usually does use jest:

• Wilgotność jest wysoka. = The humidity is high.

Unlike some other Slavic languages, standard Polish normally keeps the present-tense form of być (to be) in ordinary statements.

You may sometimes see it omitted in:

• headlines
• notes
• very informal, clipped style

For example, Wilgotność wysoka might appear on a display, chart, or weather readout, but in full standard speech, jest is the normal choice.

Why is it wysoka and not wysoki or wysokie?

Because the adjective has to agree with the noun it describes.

Wilgotność is:

• feminine
• singular

So the adjective must also be:

• feminine
• singular

That gives:

• masculine: wysoki
• feminine: wysoka
• neuter: wysokie

So:

• wysoka temperatura
• wysoka wilgotność

but:

• wysoki poziom
• wysokie ciśnienie

What case is wilgotność in here?