METAR and TAF

UK Met Office METARs and TAFs

NOTAMS Daily navigational warnings. For details of Royal Flights, Restriction of Flying Regulations, Overflight restrictions etc.

Current wind and temperature

A good site for current wind and
temperatures

European Centre for Medium Range Weather forecasts

Good site for those travelling to Europe

Iceland Aviation Weather Centre

Good site from Iceland in English, lots of useful and interesting information here.