This is a correction of a tab by jespinosa, this is the closest I've seen to the studio version. 
The Asus4 and Asus 2 are not necessary but they just make it sound closer to the real song, 
you can just hold the A... Asus2 and Asus4 are played like this, 
i like to hammer back onto the full A after Asus2. I also like to hammer on the High E string 
on the D chord

Asus4    Asus2
-0--      -0--
-0--      -0--
-2--      -2--
-2--      -2-- 
-0--      -3--
-0--      -0--

Capo 6
(Intro) D-G-D-G-D   

     D                      G      D
Well I'll be your rainy day lover.
   Em                   A(Asus4 / Asus2)
Whenever the sunny days end.
        D        D7         G           D
And whatever the weather, we have each other.
    Em            A           G  D
And that's how the story will end


     D                           G   D
Well I'll be your shade tree in summer 
    Em                         A(Asus4 / Asus2)
If you'll be my fire when it's cold.
        D        D7                 G        D
And whatever the season, well, we'll keep on breathing.
      Em                A       G   D
Cause we'll have each other to hold.
     A    (Asus4 / Asus2)              
I'll hold you- I'll sing.


G       D          A      Bm
I wanna love you, forever I do.
G       D               A   (Asus4 / Asus2)
I wanna spend all of my days with you.
     G          D                   F#          Bm
I'll carry your burdens and be the wind at your back.
D       G         A(Asus4 / Asus2)
I wanna spend my forever               

forever like that.

(D - G - D - G - D)


     D                        G     D
Well I'll be the words on the pages.
   Em                        A(Asus4 / Asus2)
If you'll be my sweet melody.
        D             D7                G           D
And the tune can keep changing, cause I'll keep arranging.
     Dm        A                G   D
And this is the song that we'll sing.

     A    (Asus4 / Asus2)              
I'll hold you- I'll sing.


G       D          A      Bm
I wanna love you, forever I do.
G       D               A   (Asus4 / Asus2)
I wanna spend all of my days with you.
     G          D                   F#          Bm
I'll carry your burdens and be the wind at your back.
G       D       A(Asus4 / Asus2)
I wanna spend my forever


         Em          G            D    
When the rain comes, I'll be your shelter.
         Em         G         D
When the wind blow, we'll be together.
         Em                G            D            A     
When the storms they rise, I'll be right here by your side.

And I'll sing-


G         D         A        Bm
I'm gonna love you, forever I do.
G         D            A  (Asus4 / Asus2)
I'm gonna spend all of my days with you.
     G          D                  F#          Bm
I'll carry your burdens and be the wind at your back.
G         D            A(Asus4 / Asus2)
I'm gonna spend my forever  

forever like that.

(Outro)
D G D G D