We may expect muggyweather when the rainy season begins.
雨季开始时，我们预料有闷热的天气。
《新英汉大辞典》
2
The season exchange, the weather burning hot, obviously the fall rain muggyweather possibly affects patient's diet and the sleep.
季节交换、天气炎热、显秋阴雨闷热天气可能影响患者的饮食和睡眠。
3
Because of the continuous muggyweather this summer, many spring and autumn flowers and trees in Shanghai's urban area are currently blooming one after another, confusing some horticultural experts.