It kind of depends on the editing software you are using.
Although ... if there's enough blue i nthe sky you may simply be able to use Saturation and slect the blues and back them off.
Also you could use the marque tool to select around the lower part of the photo and then use saturation (blue only) and back it off a bit more selectively that way.
To be even more selective (and what I usually do) is to duplicate the layer, turn off the top layer, select the bottom layer and desaturate that layer as required, then select the top layer again and use a layer mask to blend through the bits you want ... in this case it would be the parts that were too blue.
For a better idea of what I'm talking about go see my blog under resources and use the same technique I describe in my Sharpening tutorial there.
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