As a student or newbie PPL you are going to be limited by flight rules i.e. VFR which has VMC minima plus whatever your school/club and common sense should add. So visibility, cloud base, wind & your location will be the key factors, e.g. a 2000 ft base in Norfolk no problem but maybe not in Snowdonia.
YOU as a future captain/commander need to understand & decode various met charts etc. this should be taught as part of your PPL ground training.
Suggest you start with
http://www.metoffice.gov.uk/premium/...ion/#/home#top this is a free service for GA pilots.
Further synoptic charts can be found
Aviation Weather >> Europe > metar taf sigmet notam winds aloft significant weather information (see London WAFC). Give you an indication of systems in the next few days. Simply low pressure = poor wx, high pressure = good wx (but could be foggy!)
A good app is Aeroweather even tells you whether it's VMC or IMC but won't tell you if you're outside crosswind limits!
The current bad wx is caused be a series of North Atlantic polar front depressions streaming across - again this should be part of your PPL theory.
Regards Richard