Abstract: A retractable awning assembly includes a spring-biased roller assembly, a flexible canopy having an inner edge for connection to a wall and an outer edge secured to the roller assembly, and a pair of arm assemblies supporting opposite ends of the roller assembly and operable to move the roller assembly between a stored position adjacent the wall and a sheltered position spaced from the wall. Each arm assembly has an extendable support arm, a pneumatic cylinder operably connected to the support arm for extending and retracting the support arm, and an extendable rafter arm including a pair of parallel pneumatic cylinders for extending and retracting the rafter arm. The support arm has a pair of laterally spaced apart wheels which are rotatable about a generally horizontal axis, an upper end operably connected to the roller assembly and a lower end pivotably securable to the wall. The rafter arm has an upper end pivotably securable to the wall and a lower end pivotally connected to the support arm.