V létě je počasí teplé.

to be

Breakdown of V létě je počasí teplé.

• v: in
• počasí: the weather
• teplý: warm

Questions & Answers about V létě je počasí teplé.

Why is it “v létě” and not “v léto”?

Because of case.
The basic form is léto (nominative = “summer”), but the preposition v meaning “in” usually requires the locative case when talking about time and place. The locative of léto is v létě (“in summer”).
So:

• nominative: léto – summer
• locative: v létě – in (the) summer

What case is “létě”, and when is it used?

Létě is locative singular of the noun léto.
The locative is used mostly after certain prepositions (like v, na, po, o) to talk about location or time.
Here, v létě literally means “in (the) summer” as a time expression.

Why is the word order “V létě je počasí teplé” and not “Počasí je teplé v létě”?

Both sentences are grammatically correct, but the focus changes.

• V létě je počasí teplé. – Starts with the time; it feels like a general statement about what happens in summer.
• Počasí je teplé v létě. – Starts with počasí; it can feel a bit more like you’re contrasting seasons (e.g., “The weather is warm in summer (but not in winter)”).

Czech word order is flexible, and speakers often put the known or framed information (here: in summer) at the beginning.