Is it safe to climb Glyder Fach today and tomorrow?

Today on Glyder Fach is rated Marginal and tomorrow Poor, from the summit forecast. Summit forecast updated 19:10, 18 Oct. The reasons are below, followed by what the rating can't tell you.

Is it safe to climb Glyder Fach today?

Marginal Today Sunday 18 October

• Wind and gusts: Summit wind up to 26 mph, gusting 32 mph. That is past the Marginal line (wind 25 mph or gusts 45 mph): expect to be pushed about on ridges and the summit.
• Rain: 0% chance of rain, about 0 mm in all.
• Cloud: Cloud cover averages 37% and humidity 84% at summit height. The forecast gives no cloud base height; the main peak page estimates one from the valley forecast.
• Temperature and wind chill: Up to 4°C at the summit, down to 0°C, feeling as cold as -5°C in the wind. Below freezing at the summit, so expect ice on rock and paths, especially early.
• Daylight: Sunrise 07:48, sunset 18:14: 10h 26m of daylight. The longest route listed here takes about 3h 55m there and back by Naismith's rule, before stops.

Is it safe to climb Glyder Fach tomorrow?

Poor Tomorrow Monday 19 October

• Wind and gusts: Summit wind up to 40 mph, gusting 50 mph. That is past the Marginal line (wind 25 mph or gusts 45 mph): expect to be pushed about on ridges and the summit.
• Rain: 90% chance of rain, about 1.6 mm in all. A 60% chance or more makes the day Marginal on its own: wet rock is slippery and wet kit chills you faster.
• Cloud: Cloud cover averages 60% and humidity 92% at summit height. The forecast gives no cloud base height; the main peak page estimates one from the valley forecast.
• Temperature and wind chill: Up to 5°C at the summit, down to 1°C, feeling as cold as -3°C in the wind.
• Daylight: Sunrise 07:49, sunset 18:12: 10h 22m of daylight. The longest route listed here takes about 3h 55m there and back by Naismith's rule, before stops.

What the verdict covers, and what it doesn't

Peakify rates each day 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. That is all it measures: the weather forecast at the summit.

It does not know your fitness or experience, whether you can navigate in cloud with a map and compass, or what you are carrying. It does not see the state of the path, river levels, snow and ice already on the ground, or how the forecast is changing during the day. A Good day can still go wrong if you start late, turn an ankle or lose the path in mist, and a Marginal day can be fine for an experienced party on the easiest route.

On any day, carry waterproofs, warm layers, a hat and gloves, food, water, a head torch and a charged phone, and know how you would navigate if the top is in cloud. Tell someone your route and when you expect to be down. In winter conditions you need an ice axe and crampons and the skill to use them, or a guide.

Route notes for Glyder Fach

Pen y Gwryd via the Miners' Track

From Pen-y-Gwryd. A path up the south side of the mountain to the plateau and the summit boulders. Graded Moderate: a hill path, rough or rocky in places, below the Hard and Scramble grades. In cloud, take care to stay on the path. About 2h 45m there and back by Naismith's rule (3.9 km one way, 720 m of ascent).

Devil's Kitchen / Twll Du and plateau traverse

From Ogwen Cottage. A hard mountain walk to the summit from Ogwen Cottage. Graded Hard: steeper, rougher or longer than the moderate routes, with more time on high, exposed ground. About 3h 30m there and back by Naismith's rule (5.4 km one way, 790 m of ascent).

Afon Las from Nant Peris and plateau traverse

From Afon Las mapped footpath entrance. A hard mountain walk to the summit from Afon Las mapped footpath entrance. Graded Hard: steeper, rougher or longer than the moderate routes, with more time on high, exposed ground. About 3h 35m there and back by Naismith's rule (5.1 km one way, 930 m of ascent).

Pen-y-Pass ridge approach and plateau traverse

From Pen-y-Pass. A hard mountain walk to the summit from Pen-y-Pass. Graded Hard: steeper, rougher or longer than the moderate routes, with more time on high, exposed ground. About 3h 0m there and back by Naismith's rule (4.6 km one way, 700 m of ascent).

Ogwen via Bristly Ridge

From Ogwen Cottage car park. A path to Bwlch Tryfan, then the steep scramble up Bristly Ridge to the summit plateau. Graded Scramble: hands-on rock. Wind and wet rock make a scramble far more serious than its grade, so it is the first route to drop on a Marginal or Poor day. About 2h 50m there and back by Naismith's rule (3.7 km one way, 828 m of ascent).

Senior's Gully and Ridge and plateau traverse

From Ogwen Cottage. A grade 1 scramble to the summit from Ogwen Cottage. Graded Scramble: hands-on rock. Wind and wet rock make a scramble far more serious than its grade, so it is the first route to drop on a Marginal or Poor day. About 3h 55m there and back by Naismith's rule (6.1 km one way, 900 m of ascent).

Y Gribin and plateau traverse

From Ogwen Cottage. A grade 1 scramble to the summit from Ogwen Cottage. Graded Scramble: hands-on rock. Wind and wet rock make a scramble far more serious than its grade, so it is the first route to drop on a Marginal or Poor day. About 3h 35m there and back by Naismith's rule (5.6 km one way, 790 m of ascent).

Bristly Ridge

From Ogwen Cottage. A grade 1 scramble to the summit from Ogwen Cottage. Graded Scramble: hands-on rock. Wind and wet rock make a scramble far more serious than its grade, so it is the first route to drop on a Marginal or Poor day. About 2h 20m there and back by Naismith's rule (3.0 km one way, 690 m of ascent).

Full distances, ascent and times are on the Glyder Fach routes page.

In an emergency

Call 999, ask for the police and then mountain rescue. Mountain rescue teams in the UK are volunteers called out through the police. Give your location (a grid reference from a map or phone app if you can), what has happened, how many are in your group and your phone number, then keep the phone free. If you have no signal, try to move to higher ground or text 999; you need to have registered your phone with the emergencySMS service before for a text to work.

Questions about Glyder Fach

Is it safe to climb Glyder Fach today?

Today, Sunday 18 October: overcast, up to 4°C at the summit, feeling as cold as -5°C, summit wind 26 mph gusting 32 mph, 0% chance of rain. Rated Marginal. The rating covers the summit weather only; your route, kit and experience matter as much.

Is it safe to climb Glyder Fach tomorrow?

Tomorrow, Monday 19 October: moderate drizzle, up to 5°C at the summit, feeling as cold as -3°C, summit wind 40 mph gusting 50 mph, 90% chance of rain. Rated Poor.

How does Peakify decide whether Glyder Fach is safe to climb?

Peakify rates each day 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. It does not judge your fitness, kit, navigation or the state of the path.

Who do I call in an emergency on Glyder Fach?

Call 999, ask for the police and then mountain rescue. Give your location (a grid reference if you can), what happened and how many are in your group. Stay with the casualty and keep them warm.