You can get the weather bar at wunderground but it would be easier for me to just do the hard part for you.
This what you want????.....
Copy and paste the following into your signature block within your profile.
[*img]http://banners.wunderground.com/banner/gizmotimetempbig_both/language/www/US/FL/Old_Town.gif[/img*]
Be sure to remove the 2 "
*"