Photo © Shan A. Rajpoot

Knowing what the weather’s doing on your Snowdon mountain day is key to making sure you’re properly prepared and get the most out of the experience. Having the wrong gear for the weather conditions can turn a nice day out in to a nightmare.

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BEWARE of using weather apps on your smart phone as they’ll only tell you what conditions are like at your start point which can often be at or close to sea level. Typically, temperatures drop around 1°C for every 100m you climb. So as an example Llanberis lies at around 100m above sea level and the summit of Snowdon is at 1085m so you would expect it to be around 10°C colder at the top and that’s before you take into account wind chill and other factors.

Fortunately there are a few great online resources for Snowdon mountain weather forecasts both of which are easy to use, work well on a smart phone’s web browser and don’t cost a penny.

Met Office Mountain Weather Forecasts

The UK’s Met Office has been predicting the weather for over 150 years and provides twice-daily mountain forecasts for our most popular mountain areas. You can access the Met Office mountain weather forecast for Snowdon at or for the whole of Snowdonia at

Mountain Weather Information Service

MWIS forecasts contain detailed and accessible information aimed at both novice and experienced mountain users and cover ten upland regions across the country. The Mountain Weather Information Service forecast for Snowdonia is available at


The SnowdonLive project by AdventureSmart operates a weather station at the summit of Snowdon and between around April and November each year, depending on the conditions, provides a summary forecast for the following 24 hours. It mainly uses data from the Met Office and they recommend using their weather information in combination with other forecasts. A summary is shown in the ‘widget’ below or you can bookmark

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