For anyone attending I have found this weather station shows accurate and instant direction and wind speed https://www.wunderground.com/personal-weather-station/dashboard?ID=IBEAUMAR3
The one in Llandudno must have houses around it as the direction and windspeed is always way off.
Or if you're on the prom there is a handy weather vane on the corner of Clarence Rd and the Prom look up and see where the dragon is pointing
Forecast is 15kph which will provide plenty of lift from the slope just past the "rest and be thankful" on the left (narrow concrete track, you can't miss it)