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Only present, interested, or invested when things are going well, not during times of trouble or difficulty. I thought Allison and I had a strong friendship, but I learned she was just another fair-weather friend when she stopped talking to me after my divorce. I've been rooting for the home team in their playoff run, but I'll admit I'm just a fair-weather fan.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
mod. temporary; insincere. (From fair-weather sailor.) I need something more than a fair-weather friend to help me through all this.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.