the iMuseum is purely virtual these days - the actual 'real' records are the Library at Manx Museum - if you are on Loch Prom find or ask for the Shoprite store just off the prom looking at the entrance go right along edge of building until the lifts are seen - take the lift to the 8th floor walk across the car park to the bridge, cross the bridge walk up the path and take 1st entrance to museum turn left to end of corridor and the library is there - open 10am to 5pm (and not a second before!)
not open again until Weds morning
look at www.gov.im/weather/5-day-forecast/
Sunday looks to be wet