Places / Mount Fuji
UV index at Mount Fuji, Japan
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 Mount Fuji
Mount Fuji rises to 3,776 metres, and most climbers start from a Fifth Station at about 2,300 metres. The official climbing season is short, roughly early July to early September, when the summit trails are free of snow.
Elevation and your real UV
The forecast on this page covers the general area around Mount Fuji. Weather models don’t resolve individual peaks and valleys, so treat it as the level of the Fifth Station (about 7,550 ft). The WHO says UV rises by 10% to 12% for every 1,000 metres you climb. Using that rule of thumb:
| Place | Elevation | Compared with baseline |
|---|---|---|
| The Fifth Station | 2,300 m (about 7,550 ft) | Baseline |
| The summit | 3,776 m (12,388 ft) | about 15% to 18% more UV |
Read the peak UV from the chart above, then adjust it up for where you’ll actually be. There’s a worked example in UV at altitude, on snow and under clouds.
When UV is strongest here
Climbing season coincides with high summer sun. Many climbers walk through the night to see sunrise from the summit, then descend in full daylight. In cooler months, the mountain is covered in snow and ice and is only for experienced winter climbers.
On the trail
Above the Fifth Station, the slopes are bare volcanic rock and scree with no trees and no shade. The descent is long, open and sun-exposed, and often happens in the strongest morning sun after a night on the mountain.
Sun protection tips for Mount Fuji
- Cover up before sunrise. UV climbs quickly after dawn at the summit.
- The descent is where many climbers burn. Reapply sunscreen at the top and put your hat back on.
- Wear sunglasses. The volcanic slopes are bright and you’ll be squinting on the way down.
- Cloud and mist are common, but UV passes through thin cloud.
Similar places
Related guides
- What to Wear Hiking for Sun Protection: A Practical Guide
- UV at Altitude, Snow and Clouds: Why You Burn Faster
- When Is UV Strongest During the Day? Best Times to Hike
Elevations are rounded published figures. UV forecasts are model estimates for the area and can differ from what you experience on the ground. This is general information about sun safety and isn’t medical advice. Last updated September 20, 2026.