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Hefty
Only if the insulation is awful or the windows are wide open. I'd expect the temp in an unoccupied and unheated house to vary over the course of the day and drop at night, but way away from the extremes of the high/low temps of the day/night.
If the temp swings are too great then the water in the warmer daytime air will be enough to form reasonable condensation. Of course this evaporates again as the house warms up again during the day. Without any circulation (or anything else to affect this) this cycle will just repeat.
A survey should tell you if there's a specific damp problem, but then again condensation may just not be a problem once you've moved in, keeping the air circulating and not letting it get too cold.