How do you say "sunny" in Japanese?

In Japanese, "sunny" is 快晴 (kaisei). It is a adjective pronounced "kah-ee-seh-ee".

Listen to the pronunciation:

Pronunciation

快晴 is written in kanji. Romanised as kaisei, it sounds roughly like "kah-ee-seh-ee" to an English ear.

Example sentence

今日は快晴で、空が真っ青です。

Kyou wa kaisei de, sora ga masao desu.

Today is brilliantly sunny and the sky is bright blue.

Usage notes

Kaisei (快晴) means perfectly clear and sunny with no clouds. It is stronger than hare (fair weather) and implies an ideal, beautiful day.

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Questions about 快晴

How do you pronounce 快晴?

快晴 is romanised as kaisei. Say it roughly like "kah-ee-seh-ee" in English. Each Japanese syllable has even weight, so keep the rhythm steady.

Is 快晴 formal or casual?

快晴 is a na-adjective or noun-adjective. It is neutral in register and fits naturally in both casual and polite sentences. Add na before a noun, or use desu for a polite predicate.

How is 快晴 written in Japanese?

快晴 is written using kanji. Kanji characters carry the core meaning; any hiragana or katakana that follow show grammatical endings.

This word is part of the vocabulary taught in the Japanese language learning game Noun Town, where words are introduced through play rather than memorisation.