Mountain Weather

Snowdon / Yr Wyddfa cloud-base observations

See where cloud meets the mountain. Explore the latest available webcam-derived estimate, compare it with the terrain, or download a day's readings for your own analysis.

Daily readings and downloadsFor guides, researchers and developers
Snowdon / Yr Wyddfa from Lodge Dinorwig
Earlier camera image, not current conditions. Camera feed timestamp: 18 October 2026, 18:24 BST. The image and cloud-base reading may not be from the same moment.
Camera: Snowdon Webcam Images by DataCymru Ltd. CC BY 4.0.

Latest observation

Above visible tops


Older observation, not current conditions.

No cloud detected on the mapped slopes. Cloud base is higher than about 1,000 m above sea level in this view; the summit is not confirmed clear. The camera-facing slopes, not the whole mountain.

Useful context for the view now, not a promise that cloud will stay at this height. Compare it with the forecast before heading out.

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From photograph to cloud height

We match the camera view to a LiDAR terrain model, then look for where visible hillside gives way to cloud. Known ground heights turn that contact into an approximate height above sea level.

Clear reference view of Snowdon / Yr Wyddfa
1. Establish the clear view. 19 June 2025: visible ridges provide a reference for the Snowdon camera. A clear mountain does not mean a cloudless sky.
Shaded LiDAR terrain reconstruction from the Lodge Dinorwig camera viewpoint
2. Reconstruct the ground. The fitted camera projects the terrain into the same view. Shading brings out the ridges and slopes; it is illustrative lighting, not observed sunshine. This is a bare-earth model: trees and buildings are not represented.
Cloudy Snowdon / Yr Wyddfa webcam example
3. Read the cloudy scene. 14 September 2026, 18:29 BST. The image is assessed independently of the weather forecast. Foreground slopes, haze and wisps can make the cloud contact hard to place.
Snowdon / Yr Wyddfa cloud analysis overlay for the same cloudy example
4. Estimate the contact height. Around 600 m in this example. The overlay marks assessed terrain and candidate cloud contacts; it is not a traced outline of every cloud. 14 September 2026, 18:29 BST.

Selected examples to explain the process, not an accuracy test or current conditions. Photographs are resized for display; analysis overlays are added by Mountain Weather. All heights remain provisional until independently checked.

Height-coloured terrain and camera-visible ground points around Lodge Dinorwig and Snowdon / Yr Wyddfa
The view from Lodge Dinorwig. The camera looks roughly south-southeast. East is on the left of the photograph, west on the right. Coloured points show ground mapped in the camera image, grouped from left to right across the photograph. Background colour follows terrain height. North is up; camera positions are approximate. Open larger map.

With thanks to Snowdon Webcam Images by DataCymru Ltd, CC BY 4.0. Terrain: Welsh Government / Natural Resources Wales LiDAR, Open Government Licence v3.0.

Explore a day

All available height readings for Snowdon / Yr Wyddfa. Times follow the UK clock; heights are above sea level.

Download CSVJSON

23 readings on 18 October 2026.

TimeCloud baseCloud edge
Above visible topsAbove visible tops
Above visible topsAbove visible tops
Above visible topsAbove visible tops
Above visible topsAbove visible tops
Above visible topsAbove visible tops
Above visible topsAbove visible tops
Above visible topsAbove visible tops
Above visible topsAbove visible tops
Above visible topsAbove visible tops
Above visible topsAbove visible tops
Above visible topsAbove visible tops
Above visible topsAbove visible tops
Above visible topsAbove visible tops
Above visible topsAbove visible tops
Above visible topsAbove visible tops
Above visible topsAbove visible tops
Above visible topsAbove visible tops
Above visible topsAbove visible tops
Above visible topsAbove visible tops
Above visible topsAbove visible tops
Above visible topsAbove visible tops
Above visible topsAbove visible tops
Above visible topsAbove visible tops

A sharp edge is easier to locate; a soft or diffuse edge is less distinct. Above visible tops means the mapped slopes appear clear, but the camera may not resolve the summit itself. Haze, mist, rain on the lens and changing light can all complicate the view. No estimate means no usable height, not a clear sky. Downloads keep missing values empty and include any available mist and confidence flags. They contain all retained readings for the day, not a guarantee of continuous coverage.

Cloud-base data for guides, researchers and developers

Looking for cloud-base observations on UK mountains? We currently publish camera-derived readings for Snowdon and Tryfan. Use them as additional context for a hill day, to explore cloud changes or to compare a forecast with what was visible from a fixed viewpoint.

Choose a date above to download the retained readings as CSV or JSON, including observation times, available height estimates or bounds, cloud-edge descriptions and confidence flags. An empty height is missing data, not a clear summit. Coverage is limited to these camera views and the retained archive.

Please credit Mountain Weather and the camera provider, link back here, and keep the observation time and quality flags with the height. These provisional estimates are not a calibrated cloud-height instrument or a standalone basis for safety-critical decisions. For an operational feed or a research collaboration, tell us what you need so we can discuss coverage and limitations.

Decimal values in a download are model output, not a claim of metre-level accuracy. These are image-derived estimates, not instrument measurements. Camera photographs have their own licences and permissions; a data download does not grant rights to republish them.

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