By August in Laos rainfall has peaked, river levels are high and temperatures have dropped to a more comfortable mid 20’s in Luang Prabang (this is ‘winter’ after all).
A week touring Laos in August will almost certainly be accompanied by 4 or 5 days with a sudden afternoon downpour, usually preceded and followed by clear blue skies.
Laos receives far fewer visitors in these months and hotels in Laos have lower prices and better availability.
August is not the best time to head off into rural Laos where the infrastructure is poor and roads can become impassable.
August and September sees river levels high, the country carpeted in lush green and waterfalls at their most spectacular.