Again on the subject of more clouds -> higher / lower temperatures.

If these clouds are clean (i.e. consisting of evaporated water), they will keep in more energy than they keep out, causing a rise in temperatures.
If, on the other hand, the clouds are dirty, they'll block out more sunlight than they'll keep in, causing a drop in temperatures (extreme example: nuclear winter).

So if we have a global warming, we can't count on the generated clouds to cool us back down, they'll do exactly the opposite.