Just in case you weren’t aware, there is a modified version of Weathermap 0.98a, created by Thomas Urban that works with Cacti 1.0+. For a number of reasons, it will probably stay as a separate version, but if you need Weathermap and modern Cacti (and you should upgrade! Cacti 0.8.8 is quite old now), this is your best bet.

https://forums.cacti.net/viewtopic.php?f=16&t=60353