This week's season premiere episode of Monday Night Raw did an average viewing audience of 3,986,667 on the USA Network. Below is how viewership broke down by hour:
Hour one - 3,984,000 viewers
Hour two - 4,162,000 viewers
Hour three - 3,814,000 viewers
The average viewing audience was up from last week's Labor Day episode up against the return of Monday Night Football on ESPN. For those interested, the early game on ESPN (between the Lions and Giants) garnered an average viewing audience of 13,728,000 viewers and the late game (between the Chargers and Cardinals) did an average viewing audience of 11,515,000 viewers.
TV by the Numbers has complete data available at this link.