Ah.. tis true. The script defaults to converting the meteoalarm.eu output from UTF-8 to ISO-8859-1 for use in the template sets.
If you're running your non-template site in UTF-8, then changing $charsetOutput = 'ISO-8859-1'; // default character encoding of output
to $charsetOutput = 'UTF-8'; // default character encoding of output
will leave the output in UTF-8 for you.
Best regards,
Ken