also: いいてんき
Describes pleasant, clear, or good weather conditions. Often used in everyday conversation.
It's really fine weather today, isn't it?
The fair weather will probably continue tomorrow.
好天 is a formal, often written term (common in news and reports) for favorable weather, whereas 良い天気 is the casual spoken equivalent.
快晴 specifically describes a perfectly clear, cloudless sky and is used in weather forecasts, while 良い天気 more broadly means pleasant weather in everyday speech.
悪天候 means bad or stormy weather, the direct opposite of the pleasant conditions described by 良い天気.
Standard kanji spelling; can also be read いいてんき.
Kana spelling for 良い; common in everyday writing.
Colloquial kana spelling; the reading いいてんき is more casual.
Compound of 良い (よい/いい, 'good') and 天気 (てんき, 'weather'). A straightforward adjective-noun phrase.