【翻译】今天天气闷热潮湿。

我来美十年了，提供给你的答案是在美国口语中的用法，跟咱们国内教的“标准答案”未必一致，但肯定是地道的活语言的体现。
1. It's sticky (today)，或者 The weather is sticky (today), 或者 It's a sticky day (today).
2. It's been cloudy for days. （注意此处It's 是 it has的连写，不是It is）。或者，It's another cloudy day.
3. It's a sunny day (today), no wind, no cloud. （口语） It's a sunny, cloudless and windless day (today) （书面语）。或者It's a sunny day (today), cloudless and windless.
Today之所以加引号，是因为常常可以省略，因为时态本身就是一般现在时，不需要一定说“今日”。

1. It is hot and humid today.
2. It has been cloudy for couple of days now.
3. It is a nice day today, and there is not a single piece of cloud in the sky.

1It is a hotty and wetty day.
2It has been cloudy day for long.
3It is a fine day that has light wind,and the sky is blue.

1.今天天气闷热潮湿。
It's muggy and oppressive today.
It's hot and humid today.

2.现在是连阴天。
It's continuous cloudy these days.
It's continuous c