The Perseids will be viewable from the end of July to toward the end of August.
However, to eliminate the light reflecting off the Moon, and spoiling much of the action of the Perseids at its peak on August 13, it is recommended to view the meteor shower in the first ten days of August 2011.
In this way, the light of the Full Moon will not obscure the meteors. Only the brightest meteors will be observable with the Full Moon in the night sky, which will be located in front of the constellation Aquarius.
About half of all the meteors will be obscured by the Moon during its peak on August 13.
Here is a good recommendation from EarthSky (EarthSky’s meteor shower guide for 2011): “Start watching for the Perseids in the first week of August. They will be building gradually to their peak. By the second week of August, the moon will begin interfering with the skies between midnight and dawn.”
And, “On the mornings of August 12 and 13, you can still watch for some Perseid meteors to streak across this short summer night from midnight until dawn. Yet the full moon will interfere.”