Zoe,
Doesn't look too bad as far as wind goes on IOW.
http://news.bbc.co.uk/weather/forecast/337But they are known to get the forecast wrong, so i would prepare for all weather types tom!! lol..
Enjoy your day, not been to IOW in ages, and its not far away either... Let us know what beaches are dog friendly and sandy!!! Could do with a day trip somewhere like that, also not a busy beach!!