The Mundi Mundi bash site has the backdrop of wind turbines, so it should be no shock that it can get very windy out there! Take into consideration that you will need to tie things down in your campsite, or they may be gone when you return.
The average temperature ranges for August are from around 7 degrees to 18 degrees (Humidity at 3pm 41%). Average rainfall for the month is 18mm.
However, it can get very cold at night, even dropping down to close to zero on some nights. It can also get very warm during the days up to mid to high 20s.
So you need to be prepared for these 2 extremes if they happen. Bring warm gear and a very warm jacket, beanie, and gloves for nighttime and early mornings.