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Very similar to what happened to our bedroom bay window during the storms last year. Massive water ingress through failed external frame seals, which saturated the masonry and continues to dry out through to the interior surface, resulting in sopping wet plaster.
If this has happened in your case, no amount of dehumidifying is gonna sort it unfortunately; it’s a plaster-off job :(
Make sure the window is well-sealed externally first tho.
ectoplasmosis
ghostface
Every morning the flat section of wall beneath the window is wet to the touch. The bottom half of the window is no longer functioning as it should as there is a condensation build up each morning between the layers. I’ve not been up on a ladder to check the seals outside on the sill but the internal wall moisture is there each morning regardless of whether it rains overnight or not. I’ve been running a dehumidifier to pull moisture out of the room but wondering if anyone has any insight or similar experience?