A lot might depend on the temps.-problems are more likely if it's cold and the pots stay wet after the rain stops. If it's sunny and dry they'll probably be fine.

Aeoniums grow wonderfully in Cornwall so damp will probably not be a problem for them.

How cold are you? I think that would be the important point. My plants are in full gritty, and they sit in the daily summer rains - for about 4 months.

I do bring my echies and aeoniums indoors or at least under roof. They struggle for me anyway in the wet heat.

The lowest night will be 40F, daytimes will be low 60's.

I'm thinking I might bring in the bigger ones since there is more soil in their pots. The little ones in clay pots might drain pretty well. The small ones in ceramic or plastic seem to hold water more, so maybe they will come in too.

Thanks for helping me think this through!

Make sure your pots are not sitting in dishes that will hold water.

Keep a drinking straw handy, and when the rain is over, blow the water out of the center of each plant with the drinking straw.

Thanks everyone for the tips.

Rain started Friday morning. I love the rain, love that the plants get rain not treated hose water. Sadly, my beautiful CC's are going to take a beating, but they deserve a real drink too. Oh well, I've enjoyed them several weeks.