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Any twinkling of the stars or planets is an indication that the light travelling from these objects through the atmosphere is being refracted in different angles as it hits different layers both cold and warm air. The more turbulence in the atmosphere the more twinkling.
I would expect the planets to be more stable because they are not pinpoints of light, but actual reflected discs. So in answer to your question, from this backyard hack, if the planets are furiously twinkling, yes it probably bad seeing.
I am sure there are more expert members here who will confirm or deny.
Last edited by stephenb; 08-08-2009 at 08:24 AM.
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