A couple of years ago I did a local flight, weather ok when left airfield, called for rejoin about hour later and was told by ATC that a shower was passing over the field vis down to about 4km. Like a fool said "please advise if it gets worse will come in", well when I got closer to the field it was hell, couldn't find the field but knew I was right near due to landmarks, this is a main airfield with full lighting etc! Eventually did manage to find one of the runways, more by luck then judgement, but oh boy what a mistake I made, should have stayed away for the shower to pass. This time I got away with it and a very valuable lesson learnt on my part, 4k vis and vfr just is a BIG no go in my book.