Munro scored the second-fastest Twenty20 global fifty by a New Zealand player, taking just 18 balls to reach the milestone. His half-century is the second-fastest for New Zealand in T20s, behind his own record of 14 deliveries.
He said he wanted New Zealand to bat first because following is the West Indies "strong suit" and there was also the threat of rain impacting on the match. The play was eventually abandoned at 10 p.m.
Opener Colin Munro blasted 66 off 23 balls as the homeside got to 102 for 4 after 9 overs before being forced from the field.
The three-match series will be decided at the same venue on Wednesday night.
Munro's quick runs in the second T20I helped New Zealand to score 86 runs in the power play.
The series concludes with another match at the Bay Oval on January 3. Ross Taylor, who made himself available only for the first T20I, made way for Williamson. West Indies have won the toss and chose to field.
Wicketkeeper Glenn Phillips, in only his fourth one-day worldwide for New Zealand, made 56, took three catches and had two stumpings in a man-of-the-match performance which was hugely influential in New Zealand's victory.
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But Allardyce will be without Leighton Baines , Maarten Stekelenburg, Ross Barkley, Ramiro Funes Mori and Seamus Coleman. If United want to get their season back on track in the new year, they will have to improve defensively.