Routes up
Mynydd Llysiau routes: 4 ways to the top
Waun Fach CircularHiking · 12km · 650 m ascent · ~3h 30m · from Grwyne Fawr ReservoirModerate
This circular route takes you over Mynydd Llysiau and Waun Fach, offering stunning views of the Black Mountains, it is a moderate hike with some steep sections.
Grwyne Fawr Reservoir to Mynydd LlysiauHiking · 8km · 400 m ascent · ~2h 15m · from Grwyne Fawr ReservoirModerate
Starting from the Grwyne Fawr Reservoir, this route takes you directly to the summit of Mynydd Llysiau and back, offering a more direct approach.
Pen Trumau and Mynydd Llysiau LoopHiking · 10km · 600 m ascent · ~3h 0m · from CwmduModerate
This loop route takes in both Pen Trumau and Mynydd Llysiau, providing a varied terrain and excellent views of the surrounding valleys.
Black Mountains Ridge WalkHiking · 18km · from CrickhowellHard
This challenging ridge walk covers several peaks in the Black Mountains including Mynydd Llysiau, it is a long and strenuous hike suitable for experienced walkers.
Summit today
Is it safe to climb Mynydd Llysiau today?
Loading the summit forecast…
Cloud inversion · 7 days
The chance of standing above a sea of cloud on Mynydd Llysiau each morning this week, from overnight temperature, humidity and low cloud below the 663m summit.
Dark sky · 7 days
How dark the sky gets over Mynydd Llysiau each night this week, from cloud cover, moonlight and local light pollution.
Snow · 7 days
Snowfall and lying snow at the summit over the next 7 days.
Sun today
Sunrise 07:00, sunset 16:52
9h 52m of daylight. Golden hour ends 07:49 and starts 16:02. From the summit you see the sun 06:54 to 16:57.
Nearby summits
Close to Mynydd Llysiau
About Mynydd Llysiau
Mynydd Llysiau is 663 m (2,175 ft) high with 42 m of prominence. It is in Brecon Beacons, Wales. It is the 23rd highest of the 36 summits Peakify lists in Brecon Beacons. The nearest summits are Pen Twyn Glas (2.3 km), Waun Fach (2.2 km) and Pen Allt-mawr (3.6 km).
How high is Mynydd Llysiau?
Mynydd Llysiau is 663 metres high with 42 metres of prominence.
Where is Mynydd Llysiau?
Mynydd Llysiau is listed in Brecon Beacons, Wales.
Are there routes for Mynydd Llysiau?
Peakify lists 4 routes for Mynydd Llysiau, including available distance, ascent, start point, and difficulty details. The easiest is Waun Fach Circular (12km, Moderate).
Is it safe to climb Mynydd Llysiau today?
Peakify rates each day on the summit Good, Marginal or Poor from the forecast summit wind, gusts, chance of rain and wind chill. Wind of 40 mph or gusts of 65 mph make it Poor; wind of 25 mph, gusts of 45 mph, a 60% chance of rain or a feels-like temperature of -8°C or below make it Marginal. Today's and tomorrow's ratings are at the top of this page. The rating covers the weather only: also check your route, daylight, kit and experience, and in winter whether you need an ice axe and crampons.
What weather information is shown for Mynydd Llysiau?
The page includes cached mountain forecast context, snow outlook, dark-sky signals, cloud-inversion information, sunrise, sunset, and summit planning details where available.
Peakify is run by Sam Tyler, who has climbed Yr Wyddfa 22 times. The forecast refreshes every hour; how our forecast works.
