Places / Yellowstone (Old Faithful), Wyoming
UV index in Yellowstone (Old Faithful), Wyoming
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 Yellowstone (Old Faithful)
This point is near Old Faithful, not a single forecast for every corner of Yellowstone. Geyser basins and boardwalks often provide less overhead shelter than wooded paths.
When to check the UV here
Cold mornings can give way to long exposed afternoons. Check the local hourly curve before spending hours at viewpoints, and remember that cloud can change during a wait for an eruption.
Planning your time outside
Bring covering and sunglasses for open basins. Stay on designated paths and follow National Park Service guidance; a lower-UV hour does not change thermal-area hazards.
How to read this forecast
The chart loads hourly model data from currentuvindex.com for 44.4605, -110.8281. 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.