Weather-wise it is looking a little cooler and more unsettled which will help greatly in keeping water temperatures down, which has often been proved salmon can be difficult to tempt when higher temperatures persist.

Small flies and light tackle, certainly nothing bigger than 13ft will be required. A switch or single-hander will cover many situations and often prove to be a stealthy way of approaching a pool. 

Small flies around the size 12 range should do the trick. And don't forget about your hitches and sunrays which can often be deadly methods for tempting fresh grilse. 
Tight lines