My Day (1) 

Today the weather it is very hot. (2)  I'm just staying at home.  I can't go anywhere.. I'm feel so bored! (3) :(

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Comments:

(1) Titles are generally capitalized, though I often break this rule myself when writing informally.

(2) It is common to just refer to the weather or environment as 'it'.

(3) There's nothing wrong with saying "I feel so bored!", but it's more common to just say "I am so bored!"

Good job!  Consider linking your sentences together some more.  For example, "Today it is very hot, so I'm just staying home."