weather conditions; weather situation
Refers to the state of the weather, often in contexts where it affects plans or activities. Not a common everyday word; 天気 (てんき) is the usual term for 'weather'.
Depending on tomorrow's weather conditions, the match might be canceled.
Since the weather is bad, I'll skip today's mountain climbing.
The standard word for 'weather'. 天気都合 is a rarer, more formal or literary term specifically emphasizing the condition or convenience of the weather.
A more formal word for 'weather', often used in forecasts or reports. 天気都合 is less common and carries a nuance of weather as a factor in decision-making.
Compound of 天気 (weather) and 都合 (circumstances, convenience). The exact origin is uncertain; it may have arisen as a literary or formal expression for weather conditions affecting plans.