you have to go to san diego to avoid a BA flight??? hmmm .... if you are willing to go full time then the weather here is not an issue. It is very rare that we have any bad weather sufficient to stop flying for more than a few hours. Usually fronts move over us in a matter of minutes leaving behind clear glorious weather.
Also, presuming once you have the PPL you want to use it, you will be flying in UK airspace when you return. Judging the weather and negotiating different classes of airspace are essential skills that are needed when flying in the UK, meaning the possibility of much more training and confidence gaining required when returning home.