Yes, coffee can protect your skin from sun damage. The antioxidants in the coffee will help neutralize free radicals from UV rays that cause redness and skin irritation. Apart from being an after sun soother, coffee can also help protect your skin from harmful UV rays.
To calm red, irritated skin, using a coffee based treatment for sunburn, dilute a cup of brewed coffee with cold water. Then, soak a soft cloth in the liquid, wring out, and dab over the affected areas several times a day