Peak UV Potential Today
Clear sky maximum (bars) vs actual forecast (line)
Clear sky peak: -- at --
UV Index Guide
0-2 Low — No protection needed
Minimal risk for most skin types. You can safely enjoy the outdoors without sunscreen. Fair-skinned individuals may burn after 60+ minutes of continuous direct exposure. Sunglasses on bright days are still a good idea.
3-5 Moderate — SPF 30+ for extended time outside
Fair skin can burn in about 30 minutes of unprotected exposure. Apply SPF 30+ sunscreen if you'll be outdoors for more than 20–30 minutes. Seek shade near midday. A hat and sunglasses help.
6-7 High — Sun protection essential
Unprotected skin burns in 15–20 minutes. SPF 30+ sunscreen is essential, not optional. Wear a hat and UV-blocking sunglasses. Try to reduce direct sun exposure between 10 AM and 4 PM.
8-10 Very High — Extra precautions needed
Burns possible in 10–15 minutes. Use SPF 50+, wear protective clothing, and seek shade. Avoid direct sun from 10 AM to 4 PM. Reapply sunscreen every 2 hours and after swimming or sweating.
11+ Extreme — Avoid sun if possible
Unprotected skin can burn in under 10 minutes. Take all precautions: SPF 50+, long sleeves, wide-brim hat, wraparound sunglasses. Stay indoors or in shade during peak hours. Common near the equator, at high altitude, or during peak summer in the southern US and Australia.
About This Data
Data Source
All UV data comes from the Open-Meteo API, a free, open-source weather API requiring no API key.
- Current UV Index — real-time estimate factoring cloud cover, solar position, and atmospheric conditions (docs)
- Clear Sky UV — theoretical maximum assuming zero clouds, based on solar geometry and ozone modeling (
uv_index_clear_sky) - 48-Hour Forecast — hourly UV prediction from numerical weather models
- Sunrise/Sunset — solar calculations for the queried location
Location search powered by Open-Meteo Geocoding. Reverse geocoding by OpenStreetMap Nominatim.
Privacy
This site has no analytics, cookies, or intentional data collection. However, the hosting provider (Railway) keeps standard server logs, which include your approximate coordinates (rounded to ~10 km) as part of API requests. These logs are not actively monitored or shared, but they do exist.
If you share your browser location, your coordinates are rounded to ~10 km precision before leaving your browser (UV doesn't vary at finer scales). The rounded coordinates are sent to:
- Open-Meteo — to fetch UV/weather data and sunrise/sunset times
- OpenStreetMap Nominatim — to resolve your coordinates to a place name
Both services are free, open-source, and operate their own privacy policies. No other data (device info, IP, etc.) is collected or forwarded by this site.