This is the 17625th most frequent Russian word.
тёплой
The Russian word "тёплой" means "warm" (feminine, instrumental or genitive case).
The word 'тёплый' is used here to describe the weather—specifically, the warmth of the day.
У нас сегодня будет тёплый день.
We will have a warm day today.
'тёплый' describes the temperature of the tea, indicating pleasant warmth.
Я сделал себе чашку тёплого чая.
I made myself a cup of warm tea.
The adjective 'тёплый' specifies the blanket as warm, suggesting comfort.