Different sources are reporting the first Noctilucent Clouds (NLC) so far this year in the Northern Hemisphere. The clouds are seen at high latitudes and it's likely they show up at our (lower) latitudes within the next weeks. Look West about 30-60 minutes after sunset or North before sunrise and look for blue-white clouds.
A Radar at Aberystwyth provides support when NLC show up. See this link.