An important part of the planning of an outdoor activity is an awareness of the weather. There are many resources such as the Bureau of Meteorology (BOM) which can provide much information.
A starting point can be to look at historical averages for the time of year for the activity, including rainfall and temperature.
Closer to the date, more frequent checks of the forecast can influence decisions about whether to go ahead with the activity. It is also important to pay attention to any warnings about weather, flood or storms that may be issued. Alterations may need to be made to ensure safety.
This should continue to be the case during the activity. This will ensure the safety of all participants.
The BOM produce many educational resources such as the Weather Guide for Land Based Activities that are excellent to assist in planning a successful adventure.