Month for a Manicure

September Nails: Why It’s the Perfect Month for a Manicure. As summer fades into fall, September becomes a time of transition, and what better way to celebrate this shift than by updating your nails? September is a great month to refresh your look, and a manicure is a perfect way to do so. Here’s why getting your nails done in September is such a great idea, along with some trending color and design ideas.