Long sleeved summer jersey?

Do they even exist? I'm looking for something light enough to wear in 20-30ºC heat, with high UV protection. Any tips very much appreciated!

I've been looking at 'UV sleeves'. They're arm warmers that aren't (very) warm but normally SPF50/SPF60 rated.
I think Castelli make some? I know @hippy uses them.

I have Castelli and Rapha sleeves. They're basically thin arm warmers.

I'm sure there are LS summer jerseys.

http://www.bikeforums.net/touring/861324-long-sleeved-summer-jersey.html

http://forums.roadbikereview.com/apparel-cycling-clothes/summer-long-sleeve-jerseys-list-323948.html

Had seen the first forum but not the second. I'll spend tomorrow googling their recommendations and report back with any positive findings. Thanks!

eta: mostly dead links. Screw it, I'll just get a MTB jersey.

I'd just get thin arm warmers and use them with your favourite short-sleeved top.
I like the Prendas knitted ones, or the PlanetX rip offs.
https://www.prendas.co.uk/products/prendas-ciclismo-meraklon-special-edition-arm-warmers
http://www.planetx.co.uk/i/q/CLPXCOLAW/planet-x-coolmax-seamless-arm-warmers

Decathlon do very cheap LS summer jerseys, but the arms are a bit on the short size for me (6 foot 22 tall, long arms) for my chest size.
https://www.decathlon.co.uk/300-long-sleeve-cycling-jersey-black-id_8354155.html

I've got some of the planet x ones and I find them pretty warm. I wore them in sub zero temps last year for a January fell race (running) and ended up rolling them down after 10 mins

I got some weird compression ones for skiing from Velorution. They're designed for compression rather then warmth and I have used them in spring and autumn without overheating problems. And I run warmer then most. I'll see if I can find a link for ya.

Edit - or maybe cheap thin merino ones?