Today on Snowdon

Live · Open-Meteo

Challenging conditions day

Challenging summit conditions — overcast at 2°C, valley 9°C, 32 mph gusts. Downgrade route ambition and maintain wide safety margins.

Summit observed 5 Nov, 15:00 · just nowOpen-Meteo · free weather API · 15-min cache

Downgrade route ambition →

Live readings

Open-Meteo · just now

Summit temp

2°C

~1026 m elevation

Valley temp

9°C

Llanberis · ~119 m

Summit gusts

32mph

Significant — affects all

Conditions

Overcast

87% cloud

Summit data: 1026 m elevation model (Yr Wyddfa) · Valley data: 119 m (Llanberis) · Source: Open-Meteo (free, no key required)

Today, tomorrow, and the next three days

Open-Meteo forecast · just now

Best window in this short range

Sat

Sat is the cleanest summit-fit day in this three-day window.

The short-range trend looks a bit calmer and drier by the back end of the three-day window.

Use sat as the stronger option, but keep route ambition honest because this is still a forecast layer rather than a guarantee.

This is a bounded planning outlook from Open-Meteo daily forecast data, not a guarantee of upper-mountain conditions.

Today

Thu 5 Nov

More marginal summit day

Overcast

The top still looks exposed, with gusts around 41 mph shaping the day. This looks like the drier part of the window, even though a stray shower still cannot be ruled out. Upper cloud is likely to sit in for long stretches. It still looks cold on top, even if the valley start feels more forgiving.

Summit range: 1 to 3°C
Valley range: 6 to 10°C
Summit gusts: 41 mph max
Precipitation: Lower precipitation signal · 0% chance

Mean cloud ~92% · upper mountain likely murkier

Better for prepared walkers who are happy to keep ambition controlled and turn around early if the mountain feels worse than forecast.

Still a forecast rather than a guarantee — check the live page before leaving the valley.

Tomorrow

Fri 6 Nov

More marginal summit day

Overcast

Wind looks more manageable than on the rougher days in this short window, with summit gusts around 26 mph. This looks like the drier part of the window, even though a stray shower still cannot be ruled out. Cloud looks mixed rather than fully clear. It still looks cold on top, even if the valley start feels more forgiving.

Summit range: -1 to 3°C
Valley range: 7 to 10°C
Summit gusts: 26 mph max
Precipitation: Lower precipitation signal · 34% chance

Mean cloud ~69% · mixed tops

Better for prepared walkers who are happy to keep ambition controlled and turn around early if the mountain feels worse than forecast.

Useful for tomorrow-shape planning, but still worth rechecking on the day.

Sat

Sat 7 Nov

Better summit window

Fog

Wind looks more manageable than on the rougher days in this short window, with summit gusts around 15 mph. This looks like the drier part of the window, even though a stray shower still cannot be ruled out. There is a better chance of clearer tops than on the murkier days. Summit temperatures are cold enough for exposure to matter quickly once wind is added.

Summit range: -3 to 4°C
Valley range: 5 to 10°C
Summit gusts: 15 mph max
Precipitation: Lower precipitation signal · 21% chance

Mean cloud ~52% · better chance of clearer tops

Best of this short window for a summit plan, assuming the day-of live picture still agrees.

Confidence softens further out, so treat this as a day-shape guide rather than a promise.

What today means

Derived from live data

Best fit for: Groups willing to reduce summit ambition and maintain wide safety margins.
Poor fit for: Casual summit attempts without fallback planning, winter kit, or route knowledge.
Main limiting factor: Elevated wind, summit cloud / low visibility.
Planning consequence: Dry conditions expected. Standard mountain weather caution still applies — conditions can change faster than forecasts at this elevation.

Today by visitor type

First-time visitor

Not a strong first-summit day — simplify the plan, use the easiest branches, or switch to the railway/non-hiker option.

Prepared walker

Reduce route ambition and avoid forcing the sharper or more exposed lines just because the summit is technically possible.

Railway / non-hiker

A better-than-usual day to use the railway or a non-hiking day plan instead of forcing a compromised summit walk.

Travelling without a car

Transport still works, but use it to support a simpler day rather than a full-value summit attempt.

Read the mountain today

Interpreted from live data

Wind

32 mph gusts

Moderate gusts (32 mph) present on the upper mountain. Valley conditions will consistently understate the summit feel. Factor this into kit and pacing choices.

Common mistake: valley calm does not mean exposed ridges are manageable.

How it changes the day: strong summit wind increases energy cost, reduces margin for error at junctions, and accelerates hypothermia risk.

Cloud / visibility

87% cloud cover

Summit likely in cloud. Visibility may collapse sharply above 700–900m — the exact height depends on cloud base, which can shift quickly.

Common mistake: a clear start in Llanberis does not guarantee visibility at upper-route junctions.

How it changes the day: low cloud raises navigation demand and makes turnaround decisions harder.

Precipitation

Overcast

Dry conditions expected. Standard mountain weather caution still applies — conditions can change faster than forecasts at this elevation.

Common mistake: light showers at low elevation often imply worse conditions above 600 m.

How it changes the day: wet rock and wintry surfaces slow pace, increase slip risk, and raise kit requirements.

Summit vs valley

Valley 9°C / Summit 2°C

Moderate summit-valley difference (7°C). Valley 9°C, summit 2°C. The upper mountain is noticeably colder and more exposed than the valley suggests.

Why it changes the day: kit, timing, confidence, and route choice all shift with altitude. The gap between conditions at the car park and at the summit is often larger than it looks from the valley.

Ground conditions and operator context

Manual · Operator record: 24 March 2026 at 16:10 UTC

Operator record is the bundled fallback — live weather data above is more current.

Ground reports remain winter-focused and should only be treated as an additional support layer during colder periods.

Underfoot conditions matter as much as forecast headlines. Wet slabs, iced upper sections, and reduced visibility increase error cost at route junctions and steep traverses.

Practical rule: if upper-mountain confidence is sliding, downgrade early or switch to railway or non-hiker planning before travel momentum commits to a poor decision.

What kind of day is this?

Casual first-time summit

Low-demand day where casual first-timers can proceed safely.

Prepared walker day

Good conditions for walkers with mountain kit and route judgement.

Railway / non-hiker

Conditions push groups toward the railway or non-hiker branch.

✓Downgrade / delay

Summit ambition should be reduced or delayed today.

Next planning move

Conditions understood — now complete operational checks and pick a start point.

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