If it was me, because it’s cheap and in the spirit of DIY, I would certainly try it. I’ve got a couple of Sonoff Basics that I’ve attached a DHT22 to, but use them indoors.
It will probably work in a glass house/greenhouse, but will probably not be very robust. Make sure the Basic is powered through an appropriate RCD. At your risk!
Does your WiFi reach the glass house? Do you have other protocols running with openHAB? Zigbee? Z-Wave? There’s certainly more robust sensors and actuators available than using a Sonoff (though not as cheap…)