Snowdonia National Park Forecast

Also includes higher summits south to Plynlimon.

Viewing Weather Forecast for Sunday 25th September 2016
Forecast last updated on Saturday 24th September 2016 at 3:49pm

Tomorrow | Monday | Tuesday

How windy? (On the summits)

Southwesterly, 25 to often 30mph. Risk 35mph for a few hours post-dawn, and also during afternoon may freshen slightly to 30-35mph.

Effect of wind on you?

Mostly fairly small, but may impede comfortable walking on higher areas.

How Wet?

Showers: risk hail, possible lightning

Heavy showers will extend eastwards, becoming increasingly frequent, perhaps merging to near constant rain over an hour or two. Hail, and on highest summits possible sleet. Risk thunder.

Cloud on the hills?

Often confined to higher tops

Most summits clearing at times. However, cloud will come and go on higher slopes, and temporarily below 600m near showers.

Chance of cloud free summits?


Sunshine and air clarity?

Patchwork of bright sunshine, most extensive morning. Mostly excellent visibility, but suddenly reduced during showers.

How Cold? (at 900m)

5 to 7C, lowest west; but where directly exposed to strongest wind, will feel like minus 5 Celsius.

Freezing Level

Above the summits.

Planning Outlook

All mountain areas of Britain from Monday 26th September 2016

Frequent rain and strong to gale force upland winds through much of the coming week. Wettest weather will be on western mountains, whist E & S Wales and S Pennines will have very little. Later in the week, some forecasts suggest drier conditions particularly England and Wales, but the W & NW Highlands may continue to have rain at some stage daily.

In association with
Mountaineering Council of Scotland sportscotland Association of Mountaineering Instructions