But it was tough on the Bulls who had deservedly levelled through Mathieu Manset after Gareth Ainsworth's first-half strike.
Hereford adapted quickly to the conditions and had the better of the opening action with Nicky Featherstone and Manset going close before Rob Purdie's deflected drive came back off the bar with Nikki Bull beaten.
Wycombe gradually forced their way into the game and, with Purdie forced off with a hamstring injury, Kevin Betsy began to make use of some space down the left.
Two minutes before the break one of his crosses reached Ainsworth who drove a shot through a crowd of players and into the far corner of the net.
Hereford struck back 12 minutes from time when Manset clipped in Joe Colbeck's cross but Strevens had the last word, crashing in Beavon's cross two minutes from the end.
Wycombe take fifth place in the table after the victory, while Hereford remain rooted to the foot of the table.
The game was the only one able to take place in the division. The remaining League Two games were called off as the poor weather across the country continued to affect fixtures.