好天|こうてんkouten[0]heiban (flat)

1. nounfine weather
   この好天こうてんが続つづけば豊作ほうさくになるだろう。↗

   We'll have a good crop if this good weather keeps up.

• Synonym晴天せいてんWrittenA written word for clear weather; a few clouds still count, unlike 「日本晴れ」, which demands a totally cloudless sky. 「好天」 stresses weather fine for going out.
• Synonym晴れはれNeutralThe everyday word for sunny weather, also used in forecasts and weather classifications. It can further mean a formal, ceremonial occasion, as in 「晴れ着」.
• Synonym好晴こうせいWrittenFine, clear weather; a written word meaning the same as 「好天」 but rare even in writing. In daily speech 「晴れ」 or 「いい天気」 is the usual choice.
• Synonym上天気じょうてんきCasualColloquial for sunny, pleasant weather; more casual than 「好天」, which leans toward written prose.
• Related日本晴れにほんばれNeutralA gloriously cloudless sky, said with admiration, as in 「日本晴れの空」; also figurative for a clear, refreshed mind. Stresses the total lack of clouds more than 「好天」.
• Antonym荒天こうてんWrittenStormy weather with raging wind and rain; the opposite of 「好天」. Seen mostly in reports on sailing, mountaineering and the like.
• Antonym雨天うてんWrittenWeather with rain, as in 「雨天中止」 or 「雨天決行」; it stands opposite to fine 「好天」.
• Antonym悪天あくてんWrittenA written word for violent weather such as storms and downpours; the direct opposite of 「好天」. In daily speech 「悪天候」 is more common.

For fine weather good for going out, written prose uses 「好天」, as in 「好天に恵まれる」. Everyday speech prefers 「晴れ」 or 「いい天気」; for a totally cloudless sky say 「日本晴れ」, and in writing 「晴天」. The opposites are 「悪天」, 「荒天」 and 「雨天」.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 晴はれて天気てんきがよいこと。