Places / Grand Canyon South Rim, Arizona
UV index in Grand Canyon South Rim, Arizona
Check another placeLoading today’s UV…
- Low 0 to 2
- Moderate 3 to 5
- High 6 to 7
- Very high 8 to 10
- Extreme 11+
Hour-by-hour numbers
| Time | UV index | Level |
|---|
The next few days
Each day’s UV curve and peak, drawn on the same scale so you can compare. The forecast reaches roughly four days ahead.
What to do today
About Grand Canyon South Rim
The forecast point is at Grand Canyon’s South Rim, not at the Colorado River. Rim walks, viewpoints and trails descending into the canyon offer very different amounts of shade and shelter.
When to check the UV here
Do not treat a rim UV forecast as a complete description of an inner-canyon hike. Sun position changes shade along a route, and lower UV does not establish safe temperatures below the rim.
Planning your time outside
Carry protection for exposed viewpoints and the return climb. Use National Park Service route and heat guidance when choosing a hike, alongside the hourly UV forecast.
How to read this forecast
The chart loads hourly model data from currentuvindex.com for 36.0544, -112.1401. Times are local to this forecast point. Open Hour-by-hour numbers for the values, or compare the next few days below the main chart.
The forecast describes UV for the area, not the dose on your skin. Buildings, trees, cloud and reflective surfaces can change your exposure. It does not measure a particular beach chair, trail or street.
What time does UV drop below 3?
Read the descending side of today’s curve, then check that the later hours remain below 3. The time changes with the date and weather. See how to find the afternoon drop instead of using a fixed clock time.
What should I bring?
Plan sun protection when the forecast reaches 3 or higher. Shade, covering, a hat, sunglasses and sunscreen work together. At very high UV, arrange outdoor time around the peak rather than relying on sunscreen alone.
Nearby or similar forecasts
Related guides
Sources and local information
UV forecasts are model estimates and can differ from conditions on the ground. Live data requires JavaScript and a connection to the provider; no typical UV values are substituted if it fails. Page updated October 15, 2026. See how the data works.