The only rain you'll see at the festival?
The climate in the Gangagruwan, Kangaroo Valley is mild, and generally warm and temperate (globally speaking).
Locally, the weather in August is best described as cool, mostly clear and dry with light winds.
The average temperatures in August are:
High: 17 deg Celsius
Average: 11 deg Celsius
Low: 7 deg Celsius
The number of rainy days in the month of August are on average 5.3 days, which makes it the driest month of the year by number of rainy days. (A rainy day is one with at least 1 millimetre precipitation - that's not much rain!). The average rainfall total for August is 57.5mm.
We'll be honest: the water is cold in August. But that hasn't stopped people from swimming!
Source: https://weatherspark.com/y/144490/Average-Weather-in-Kangaroo-Valley-Australia-Year-Round