Warner completed 22-of-32 passes for 261 yards with no interceptions, leading the Cardinals to a 41-21 victory.
The five touchdowns equaled a single-game career high and made the former Northern Iowa product the first Cardinals' quarterback since Charley Johnson in 1969 to throw five scoring passes in a single game.
The effort followed five interceptions in a 34-21 loss to Carolina, and was his eighth monthly player award in his 12 NFL seasons.
Other NFC honors went to New Orleans tackle Anthony Hargrove (defense) and Tampa Bay kick-returner Clifton Smith (special teams).
Hargrove had two fumble recoveries, a touchdown on a fumble return, a forced fumble and three tackles in the Saints' 30-20 win over Carolina.
Smith totaled 161 total return yards in the Bucs' 38-28 win over Green Bay, their first this season.