天気|てんきtenki[1]atamadaka (head-high)

1. nounweather
   彼かれは天気てんきのよい日ひを利用りようして壁かべを塗ぬった。↗

   He took advantage of the fine weather to paint the wall.
2. nounfair weather; fine weather
   今日きょうが天気てんきならいいのに。↗

   I wish it were fine today.

• Synonym天候てんこうWrittenWritten word for weather conditions over a period of time; mostly found in formal statements and news reports, as in 「天候不順」.
• Synonym空模様そらもようCasualColloquial word for what the sky looks like, often hinting that rain is on the way; also figuratively the way a situation is trending.
• Synonymお天気おてんきCasualPolite colloquial form of 「天気」; also refers to a person's mood or temper, as in 「お天気屋」.
• Synonym気象きしょうWrittenWritten word for atmospheric phenomena; the term of meteorology and institutions, as in 「気象庁」.
• Synonym日和ひよりCasualColloquial suffix for weather ideal for a particular activity, as in 「行楽日和」.
• Related晴れはれNeutralNeutral word for sunny weather as a weather type, the counterpart of rain or cloud.
• Related好天こうてんWrittenWritten word for fine weather, at home in news reports, as in 「好天に恵まれる」.
• Related晴天せいてんNeutralNeutral word for a clear, sunny sky; a touch more written in tone than 「晴れ」.
• RelatedウェザーCasualColloquial loanword for weather, used mainly inside compounds such as 「ウェザーニュース」 rather than on its own.
• Related日本晴れにほんばれWrittenWritten word for a completely cloudless, glorious sunny day; can also describe a bright, clear state of mind.
• Related空合いそらあいCasualOld-fashioned colloquial word for the look of the sky; figuratively, how things are progressing. Rarely used today.
• Related日和びよりCasualColloquial suffix for weather ideal for a particular activity, as in 「行楽日和」.
• Related上天気じょうてんきCasualColloquial for exceptionally fine sunny weather, said with a note of admiration.
• Related天気模様てんきもようCasualColloquial word for how the weather looks; fairly uncommon — in daily speech people just say 「天気」 or 「空模様」.
• Related好晴こうせいWrittenWritten word for pleasantly clear, comfortable weather; very rare — everyday speech uses 「快晴」 instead.
• Antonym荒天こうてんWrittenWritten antonym to the fine-weather sense of 「天気」: stormy weather with fierce wind and rain; much used in shipping contexts.
• Antonym悪天あくてんWrittenWritten antonym to the fine-weather sense of 「天気」: bad, wild weather.

Use 「天気」 by default. For formal or news contexts pick 「天候」, and 「気象」 for scientific talk. For sunny weather use 「晴れ」 or 「好天」, and 「日和」 for a day perfect for some activity. For bad weather turn to 「悪天」 or 「荒天」. The rest are rarer or narrower: 「空模様」 for the look of the sky, 「お天気」 for the polite or mood sense.

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

1. 降水こうすいがあるかないか、雲くもが多おおいか少すくないかといった、空そらの様子ようす。また、気圧きあつ・気温きおん・風向ふうこう・風速ふうそくなどの大気たいきの状態じょうたいやその変化へんかのこと。
2. 語義ごぎ1のうち特とくに晴はれていること。天候てんこうがよいこと
3. 天子てんしの機嫌きげんの漢語かんご表現ひょうげん。皇帝こうてい・天皇てんのう・主君しゅくんなどの機嫌きげん。御ご天気てんき、御機嫌ごきげん。