The game between Bonds Glen and Bready was a second attempt so the wash-out means no points for either side effectively ending Bready's outside hopes of the title.
At Donemana, just half of a 10 overs per side match was possible with rain at the interval forcing the officials to abandon the game, much to the frustration of the home side.
This second and final opportunity saw St Johnston make 90 for 7 with Graeme McCarter (26) top-scoring and skipper David Anthony hitting 23 - Jordan McGonigle (2-11) the best of the bowlers.
Donemana stay 7th with three games left, while St Johnston remain in 10th slot.