I've just been out with two more gauges, which I've been fitting into a panel for my boiler flow and return temperatures. My weather station, in an homemade Stevenson screen says 32.8C, and the two gauges with their sensors also outside in the shade of my workshop, agree on 32.7C.
I had always assumed my Stevenson screen on the weather station, 'needed more work' - would still read a bit high in full sun and no breeze. The sensor has a built-in screen, which I wasn't convinced was adequate in full sun, so then over the top I adapted a series of upside down plastic plant pot dishes, painted silver.