Playing outside

Honestly, if you can't let them on the grass, which I really don't think you should under your circumstances, I don't really see much advantage to taking them outside. But if you still want to, the patio would probably be OK. Make sure they have shade from the sun, and stay with them to keep any dogs away. I've got all kinds of critters in my back yard, and none of my pigs have ever had any issues. As for temp., I don't take Louise out until it's in the low 70's, and I bring her in if it gets to the mid 80's. But sometimes the ground is actually warmer or cooler than the air temp., so keep an eye on that, too.

I have a similar situation in a way. My solution? Fleece/towel. While they don't get the fun of the grass, they get to play outside safely.