Sony announced on its blog that the PlayStation Store and online account management settings on the PlayStation 3 and PSP will be inaccessible between those hours.
The PlayStation Vita was not mentioned in the online bulletin, so it is unknown whether services will be available to users of the handheld.
"PlayStation Network is offline for scheduled maintenance from 06:00 to 09:00 GMT on Monday 12 November 2012," read a statement from Sony.
"During this maintenance, you can continue to collect in-game trophies and these will be updated on your profile once PlayStation Network is back up and running."
Last month, Sony implemented an overhaul of the PlayStation Store, bringing in a new look, additional features and improved navigation.
Watch our video review of the PS3 super slim below: