47% chance of a view, in and out of it all day.
The summit sits about 265 m inside the layer.
Forecast for Friday 16 October, built 2026-10-16 16:22 UTC and rebuilt twice a day. A high number is close to reliable, a low one is barely better than a shrug: how reliable is this?
Fri 16 Oct
47%
in and out of it all day
Sat 17 Oct
75%
in and out of it all day
Sun 18 Oct
94%
clear of the cloud
The hill
- Lists
- Hewitt, Nuttall
- Height
- 833 m (85 m of drop)
- Area
- The Carneddau
- County
- Conwy, Wales
- Grid ref
- SH697630
- OS Landranger
- 115
- Summit
- scattered cairn on W edge of summit
Sun
- Sunrise
- 06:44 ESE
- Sunset
- 17:18 WSW
- Daylight
- 10.57 hours
About Pen yr Helgi Du
Pen yr Helgi Du is a mountain peak in the eastern part of the Carneddau in Snowdonia, North Wales.
From Wikipedia, CC BY-SA 4.0
Hour by hour, Friday 16 October
| Hour | View | Cloud base | Temp | Wind |
|---|---|---|---|---|
| 06:00 | 27% | 379 m | 3.9° | 24 WNW |
| 08:00 | 29% | 391 m | 3.5° | 24 WNW |
| 10:00 | 30% | 405 m | 4.0° | 23 WNW |
| 12:00 | 48% | 568 m | 3.9° | 23 WNW |
| 14:00 | 56% | 626 m | 4.0° | 23 NW |
| 16:00 | 37% | 547 m | 3.6° | 26 WNW |
| 18:00 | 40% | 513 m | 3.7° | 25 NW |
| 20:00 | 38% | 571 m | 4.3° | 20 NNW |
Nearby
Carnedd Llewelyn · Pen Llithrig y Wrach · Foel Grach · Yr Elen · Creigiau Gleision · Carnedd Dafydd
All Snowdonia hills for Friday 16 October · The week ahead · How to read this