You could use this keywords similar to the CVS keywords between Dollar-Signes: $Keyword$, but you have to tell SVN specifically to update the keywords in your files.
I actualy have not found a working way to automate the replacement on commit.

You could do it for all keywords (space separated) and file by file with the following line:

svn propset svn:keywords "Date Author" weather.txt

Date
This keyword describes the last time the file was known to have been changed in the repository, and looks something like $Date: 2002-07-22 21:42:37 -0700 (Mon, 22 Jul 2002) $. It may also be specified as LastChangedDate.

Revision
This keyword describes the last known revision in which this file changed in the repository, and looks something like $Revision: 144 $. It may also be specified as LastChangedRevision or Rev.

Author
This keyword describes the last known user to change this file in the repository, and looks something like $Author: harry $. It may also be specified as LastChangedBy.

HeadURL
This keyword describes the full URL to the latest version of the file in the repository, and looks something like $HeadURL:
http://svn.collab.net/repos/trunk/README $. It may be abbreviated as URL.

Id
This keyword is a compressed combination of the other keywords. Its substitution looks something like $Id: calc.c 148 2002-07-28 21:30:43Z sally $, and is interpreted to mean that the file calc.c was last changed in revision 148 on the evening of July 28, 2002 by the user sally.