It will be hot (although not as hot as you might think) and it will be humid. There will be some nights in air conditioned accommodation.
The average daily maximum is 35ºC (95ºF). If we get a spell of relatively dry weather, the temperature could reach 40ºC (104ºF). The average minimum is 24ºC (75ºF). Sleeping bags are not needed. Rain is almost certain.
On average it will rain every second day, mostly in short, sharp bursts. Averages can, however, be misleading. Occasionally, it might rain for days at a time. (This makes it somewhat harder to walk but it also makes the waterfalls more spectacular and keeps it relatively cool.) Occasionally, it may rain very little. This makes it substantially hotter than normal. There will be many opportunities to swim and cool off, but you must be prepared for hot, humid conditions.