Are there drain holes in the base of the cushions?
Waterlogged cushions can be very hard to dry out, and not all cushions use the same foam and materials so there isn't an easy universal answer.
I'd start by trying to compress them and squish as much water out as possible and then bring them indoors to someplace warm and dry. Maybe even put them in a room with a dehumidifier (if you have one).
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