The New Zealand Warriors have maintained their perfect home record in the NRL this season, shrugging off injury woes to beat the Raiders 14-6 in terrible conditions at Mt Smart Stadium.

After Michael Witt had put the Warriors ahead with a penalty midway through the half, the five-eighth was instrumental in his team's opening try from the ensuing kick-off.

He regathered his own chip-and-chase on the final tackle, and centre Brent Tate finished off the move, with Witt adding the extras.

Canberra came back out after halftime with a second wind and spent a period camped inside the Warriors half.

They were rewarded when hooker Lincoln Withers, backing up from representative duty with NSW Country last Friday, grabbed the loose ball from a final-tackle play to force his way over.

Withers' NSW Country teammate, halfback Todd Carney, added the extras, but Carney then dropped the following kick-off on his own goal line to present the Warriors with cheap territory.

The home side took advantage and centre Ryan Shortland dived on a Nathan Fien kick into the in-goal.

Witt had a rare miss with the conversion, but made it an eight-point game again with his second penalty.

With the rain becoming heavier and the Warriors finishing the stronger, Witt missed with another penalty when he lost his footing on the slippery surface and the tee ended going further than the ball.

The result allowed the Warriors, with their fourth win at home, to join the Raiders in mid-table on eight points.

It also extended Canberra's lack of recent success at Mt Smart Stadium, where they have not won since 2001.

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