Do I need sunscreen on cloudy days?

Yes, you need sunscreen on cloudy days because clouds block visible light, not UV rays — especially UVA, which causes aging and skin damage. Up to 80% of UV rays penetrate cloud cover, and rain doesn’t help either. If you’re outside for more than 15 minutes and care about your skin, put it on. A cloudy day just means you skip reapplication every 2 hours, not that you skip sunscreen entirely.