Well, but unless you're unusually sensitive to humidity or air pressure, a thermometer and a look outside would have told you just as much useful info.
(Sure, you COULD use it to track trends, as in is air pressure falling or rising, which is a very crude indicator of weather to come)
You'll be leaving the reach of your own little microclimate rather soon anyway.
So, since you already know the weather where you're starting from - or can know well enough by the use of a window and a thermometer, the info you'd benefit more from is the weather along the route.
Which the personal weather station won't help you with.
Unless you have a friend or a relative along your intended route that you can set the gizmo up at. Then call, have a nice chat, ask about the weather there.
Don't get too friendly though, as then you'll chat all your riding time away.