墨尔本的春天天气

The corrections are according to your English meaning.

天气今天晴, 也好但不太热.
Today's weather was clear and sunny but not too hot.
墨尔本的春天通天气常 溫暖有点热和一点下雨.
Melbourne weather in spring is normally warm and rainy.
我喜欢在去散步看春天看的花草树木.
I like to go for a walk to look at the spring flowers and trees.
现在树木在公园的树木都非常绿色.
The trees in the park are so green now.

墨尔本的春天

今天天气晴朗但不太热. (晴好is correct but 晴朗 more accurate  )
Today's weather was clear and sunny but not too hot.
墨尔本的春天天气常有点热和多雨.
Melbourne weather in spring is normally warm and rainy.
我喜欢去散步，看春天的花草树木.
I like to go for a walk to look at the spring flowers and trees.
现在公园里的树木都很绿了.
The trees in the park are so green now.

There are tons of ways that express one thing in our language, but I think you should focus on how to express it clearly to let our people know what's your mean, I have a British friend, he already been here three years but cannot speak it out correctly to make people get his point. I hope you can correct my English as well: )

墨尔本的春天天气

今天天气今天晴好但也不太热.
Today's weather was clear and sunny but not too hot.
墨尔本的春天天气常有点热和一点下雨通常很温暖，有时有雨.
Melbourne weather in spring is normally warm and rainy.
我喜欢去散步看春天的花草树木.
I like to go for a walk to look at the spring flowers and trees.
现在树木在公园都非常绿色郁郁葱葱.
The trees in the park are so green now.

your wirting like a poem:)  

墨尔本的春天(天气)

今天天气晴好但不太热.
Today's weather was clear and sunny but not too hot.
墨尔本的春天(天气)常有点热和一点(下)雨.
Melbourne weather in spring is normally warm and rainy.
我喜欢去散步,看春天的花草树木.
I like to go for a walk to look at the spring flowers and trees.
现在公园里的树木都非常绿(色).
The trees in the park are so green now.