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If the sunroof drains are coping with th ewtaer quick enough (e.g they ain't partially blocked at their lower end or such) then I would suspect either a leak between the glass and its seal or between the sunroof frame and body work.
It may be worth checking the outlet ends of the drains as there are known to get bunged up with gunge and muck. If all is OK in that aspect you could try temporarily sealing the frame to bodywork area with duct tape and see what happens
Currently in madnoel10's garage:
Honda Civic 1.4l