Hmm... Are you sure you only lost the weather templates Chris? Normally when upgrading to a new version of vB it will delete any templates that haven't been customized. I'm not quite sure why it does that when many people will have new templates from hacks, but I guess it's easier for them to delete all that haven't been customized rather than listing them all out. There should be 37 index templates, not including the 4 for the weather. You may want to double check that you have all of them. If you are missing any you can upload the myvb_install.php file to your admin folder and go to http://yoursite.com/forums/admin/myvb_install.php?
step=3. You don't have to worry about it overwriting any custom templates or anything as those should still be there, so it may be a good idea to do that anyways just to be sure. As for the weather... If you'll upload your weather_install.php file to your admin folder, go to that page in your browser, and only continue to the 2nd step, that will restore your weather templates. You shouldn't have any problems with that, but if you do let me know.
Oh, and incase anyone is wondering, Chen was kind enough to change my name to Tigga for me.