I think Dan is getting confused with the Isle of Man, which is somewhere (and something) else entirely - sorry Dan!
The Isle of Wight is fine in April - don't expect to be sat on the beach in your shorts, but it will be fine. Having spent many New Years Days walking Isle of Wight beaches, any time of year is fine for a little walk as far as I'm concerned! However by April, you've got a reasonable chance of pleasant sunny days and providing you're sensibly dressed you'll be fine. Typically you can expect 12-16 degrees celcius, whether it rains or not is down to your luck, and it will probably be breezy at the beach.
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