It's not an 'Outside Air' temperature gauge, it's the temp detected by the sensor mounted under the tupperware somewhere near the air intake, so it's getting some heat from the engine, reflected heat off the road surface (if it's a hot day), some protection from any breeze/moving air, and so it's showing you a temp that's
WAAAY CLOSER to the Engine Air Pre-Intake temp than anything else!!

Some marketing guru probably thought it'd be a good selling point to show ambient temps on the dash, but the BRP bean counters wouldn't allow the dollars to add a sensor to give that (and it would probably add to the retail price!) so the decision was made just to use the temp sensor already there, even tho it doesn't really show ambient temp! :gaah:
You can either ignore it; get used to it reading high & going up whenever the 'under-tupperware' temp rises; or if you are really keen, you could locate it & move it away from the under-body/air intake location.... but if you do that, it
might mean the engine computer thinks the intake air is a bit colder & denser than it really is when it gets sucked into the important bits, which could result in the engine using a bit more gas & maybe running not quite as well as it could?!? :dontknow:
Me, I'd live with it as it is, knowing it's usually going to be somewhat off the 'official' temperature, but then those temps are usually taken from inside a box/Stevenson screen that's often located sorta in the shade or still air somewhere, so are they a real reflection of the temps you're ryding in??
Ryde More, Worry Less! 
hyea: And don't think that temp display is necessarily showing you anything gospel! :lecturef_smilie: