Strangely, the south of the island seems to get more sunshine than the mainland. Ventnor often boasts glorious sunshine when Hampshire is covered in cloud.
The Isle of Wight is a wonderful place for a holiday. It's bursting with things to see and do. The attractions are cheaper than on the mainland. Have a great time!
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Answers
You can expect whatever weather the rest of the south coast is getting.
It’s only about 5 miles off the coast!
So most likely it will be warm, wet and windy.
The August average is about 27c, its’ 30 odd miles south of our place.
http://www.iowbreaks.com/weather/index.php