The Sonance in ceiling  speakers sold on the Sonos website are not rated for outdoor use, no. You can use any 3rd party ceiling speakers that is 8 ohm, very common, with the Sonos Amp.

If you decide against ceiling speakers, the outdoor sonance speakers are outdoor rated, as well as the Sonos Roam and Move. 

Hi Danny, Thanks for the quick response. I would prefer something concealed than the wall mounted outdoor speakers. Are there any recommendations for inceiling outdoor speakers that has been tried with Sonos Amp?

Will this one work?

Pyle 6.5 Inch 300W Dual Channel 8 Ohm Home Audio in Ceiling Marine Grade Waterproof Speaker with 60Hz to 22kHz Frequency Response (2 Pack) https://a.co/d/4POYx7c

Those would work, but I would not expect too much quality from Pyle.

I’ve had these under my back patio for a couple years now.  They are moisture resistant, but fully marine grade, but my speakers are not getting wet directly.  I live in the Houston area, so plenty of heat and moisture. but again, not direct heat and moisture.

Great, Thanks. Mine is a very similar use case.