The Rocks’ penalty curse struck again as another miss from the spot cost them dear in the Sussex derby at the Dripping Pan.
Kane Wills’ kick was well saved before Nathan Crabb scored an 80th-minute for the hosts on an afternoon when the travelling Rocks fans also got a real drenching.
The Rooks might have taken the lead on six minutes when a cross almost deceived keeper Tom Boyle - playing in place of Craig Stonewr, serving a delayed one-match suspension - but he recovered to make a fine save. A Simon Wormull shot for the hosts flew just wide.
Ex-Rock Stpehen Brinkhurst hit the post with a cross-shot from the right. The same player blasted a shot over when well placed 15 yards out.
A foul on Harvey Whyte - playing in probably his penultimate game for the Rocks before going back to Havant & Waterlooville - earned the Rocks a penalty six minutes before the break.
With normal taker Ashley-Paul Robinson on the bench, Wills stepped up for it - but saw the Lewes keeper Kieron Thorp save well.
The Rocks made a couple of changes after the break, with Robinson replacing Lewis Stockford and Jon Marzetti coming on for Daryl Wollers.
In terrible conditions, both sides struggled to play any fluent football to entertain a superb crowd of 883 - many of whom had made the journey from Bognor.
Midway through the half a scramble from a Wills corner saw a Lewes defender head off the line.
Five minutes later there was the welcome sight of Ben Andrews making his return after several weeks out with a knee injury. He came on for Dan Beck.
Brinkhurst was booked after being accused of a dive in the box.
Crabb got the breakthough for the hosts with ten minutes to go but the Rocks were denied a point when the keeper made a superb double save to deny Terry Dodd and Stuart Axten in the third minute of time added on.
Rocks: Boyle, John, Wollers, Crane, Axten, Partridge, Beck, Wills, Dodd, Whyte, Stockford. Subs: Robinson, Marzetti, Tuck, Kempson, Andrews.
The Rocks look to recover from the defeat when they go to East Thurrock on Saturday. Then they host Whitehawk on New Year’s Day (3pm).