下雨了。
It is raining.

Explain:
下雨 rain
了 (past tense marker)
Notes:
“下雨了。” means “It is raining.” This is a common expression of talking about the weather when it rains or you want to start a conversation with someone.

天气真好。
Nice weather. / Such a fine day!
Explain:
天气 weather
真 very
好 nice/fine
Notes:
“天气真好。” means “Nice weather. / Such a fine day!” This is a very useful daily expression of talking about the weather. It’s usually a pleasant beginning to talk to someone.

好冷啊！ How cold!
太热了！ Too hot!
Explain:
好 very
冷 cold
啊 (used at end of an interjectional sentence to emphasize the exclamatory tone)
太 too
热 hot
了 (modal marker)
Notes:
“好泠啊！ /太热了！” means "How cold! / Too hot!" This is a common Chinese phrase, and may be used when there is cold/hot weather or you want to strike up a conversation with somebody. Obviously you are not satisfied with the weather.

夏天热吗？
Is it hot in summer?
Explain:
夏天 summer
热 hot
吗 (a particle used at the end of questions)
Notes:
“夏天热吗？” means “ Is it hot in summer?” In oral Chinese, this phrase is widely used to inquire about the weather in some place.

挺凉快的。
It’s quite cool.
Explain:
挺 very
凉快的 cool
Notes:
“挺凉快的。” means “ It’s quite cool.” “挺” is a very useful word in Chinese which means “quite” or “very”. For example，“挺好。（Very good.) ”“他挺高兴的。(He is very happy.)’’

这里气候不错。
The climate here is quite comfortable.
Explain:
这里 here
气候 climate
不错 nice
Notes:
“这里气候不错。” means “ The climate here is quite comfortable.” This is a phrase for describing the weather that provides a pleasant feeling and that makes you feel physically relaxed without being too hot or cold.

我喜欢这里的天气。
I like the weather here#
Explain:
我 I
喜欢 like
这里的 here
天气 weather
Notes:
“我喜欢这里的天气。” means “I like the weather here.” This is a quite useful expression showing that you like the weather very much. It also can be used as a compliment to some place.

我不喜欢冬天。
I don't like winter.
Explain:
我 I
不 not
喜欢 like
冬天 winter
Notes:
“我不喜欢冬天。” means “I don’t like winter.” This is a common expression showing you don't like the season. 冬天 in this sentence can be replaced by "春天(spring) " "夏天(summer)" and "秋天(autumn) ".

听说明天有雨。
It's said it will rain tomorrow.
Explain:
听说 hear
明天 tomorrow
有雨 rain
Notes:
“听说明天有雨。” means “It's said it will rain tomorrow.” This is an informal description of what the weather will be like in the near future.

天气预报怎么说的？
What does the weather forecast say?
Explain:
天气 weather
预报 forecast
怎么 what
说 say
Notes:
“天气预报怎么说的？” means “What does the weather forecast say?” This sentence is used to inquire about the weather forecast.