Do You Actually Need Sunscreen for Your Evening Walk? Here's What the UV Data Says

The Honest Answer Might Surprise You

Here is something the sunscreen industry rarely says out loud: if you are going for an early morning or evening walk in most of North America during spring, you probably do not need sunscreen for that activity. UV radiation levels at those hours genuinely do not warrant it for the majority of healthy adults.

UV exposure risk scales with UV index, and UV index varies enormously based on time of day.

Understanding UV Index

The UV index is a standardized measure of the intensity of ultraviolet radiation reaching the Earth surface at a specific location and time. Risk categories: low (0-2), moderate (3-5), high (6-7), very high (8-10), extreme (11+). Before roughly 9 a.m. and after 5 p.m. in the northeastern United States, the UV index averages below 3 during spring.

When the Math Changes

People on photosensitizing medications: Doxycycline, widely used for acne and Lyme disease, dramatically increases UV sensitivity. Hydrochlorothiazide, one of the most commonly prescribed blood pressure medications, does the same.

People with elevated skin cancer risk including those with a personal or family history of melanoma, numerous atypical moles, or fair skin with a history of sunburns. For these individuals, protection is warranted even at lower UV index values.

How to Check Before You Head Out

The UV index is freely available and updated hourly for virtually any location. The EPA UV Index tool, the Weather Channel app, and native smartphone weather widgets all display it. A 10-second check before your walk tells you whether protection is warranted. Know your numbers. Go outside.