Any windsurfer will tell you that a 2-day period without wind is called a weekend.
Trying to predict when it’s going to be windy in the UK is nigh on impossible. Traditionally water skiers go out early mornings while it’s still calm, but sometimes that’s the only breezy time.
A lot depends on the season, and whether it’s a high or low pressure system we’re covered by.
Either way, log onto windguru.cz or xcweather, or even metcheck to give a half reasonable prediction.
I’ve been windsurfing for over 25 years and still have wasted trips to the coast when the forecast wind doesn’t turn up.