Too short.  This is a good length for the office.

Don’t push it with the short skirts. Work is still work. When you have to wear business attire the skirt shouldn’t be shorter than just above the knee. Even in warm weather. The gray skirt with a contrasting jacket on the right, is a good look for a professional woman. The skirt out fit on the left is cute, but just a bit too short to give a strictly business like impression. You can wear a matching skirt suit, or a skirt with a different jacket. Both work just as well.