• Invest in a large trash compactor garbage bag and punch a hole for your head in the bottom (very important).  Consider it a Halloween costume and a solid way to stay dry pre-race.  Or, you can go with a smaller cinch bag for a better look and style – I once ran half a marathon in a white bag to stay dry (with arm holes of course).
• Wear a hat with a visor to keep the rain out of your eyes and a pair of running gloves that you can easily stuff into your shorts if your hands get too hot.  Accessorize with a shower cap for the start to complete your costume (looks funny but keeps your head dry).

Full Runners World Article HERE