I've got some Paramo kit. Indeed jacket I use most is a Paramo Velez Adventure Light. Done over 3000 miles in it in comfort, no real problems. I walk cold, so find it okay with side zips completely undone on most summers days. And very easy to slip on and off. But if you walk warm would not be good for summer.
Main downside I've found is that you have to look after very carefully to maintain waterproofing. You need to wash pretty frequently (and make sure not even a trace of detergent gets anywhere near them when washing), and re-proof about every 12/ 18 months.
They do...as said already... sell windproof jackets that are probably fine for many summers days, and apparently these when used with a Paramo fleece form a waterproof combo (even though neither is waterproof on their own.) I own a couple of these, but haven't used them extensively yet, so can't say more.