Developed by a hiker, for hikers. Free 14-day mountain weather forecasts for all 18 Mourne peaks — including Slieve Donard (Northern Ireland's highest mountain at 850m), Slieve Commedagh, Slieve Binnian, and Slieve Bearnagh — with features built around what you actually need on the hill. Check wind, rain, temperature, and visibility with colour-coded traffic light ratings, view a live rain radar centred on the Mournes to see exactly which direction weather is tracking, plan overnight trips with a wild camping conditions score, and predict golden hour with a sunset quality rating for photographers. The Mournes are an Area of Outstanding Natural Beauty (AONB) in County Down, Northern Ireland, roughly 50 km south of Belfast, accessible from Newcastle, Kilkeel, Rostrevor, and Castlewellan. Works offline as a PWA — add it to your home screen for instant access even without a mobile signal on the mountain.
Yes - the app is a Progressive Web App (PWA) and works offline. Add it to your home screen on iPhone or Android for instant access, even without a mobile signal on the mountain.
Each forecast period is colour-coded: Green means conditions are within your set thresholds, Amber/Caution means a threshold is being approached, and Red/Warning means a threshold has been exceeded. Wind speed, gusts, temperature, rainfall, and visibility thresholds can all be customised in Preferences.
The camping score looks at wind, wind chill, rain, and cloud cover across the full day to produce an Ideal / Good / Fair / Poor / Severe rating. Gusts are the biggest factor, followed by how cold it feels. A freezing level warning is shown separately if snow or ice is possible on the summit.
Partly cloudy skies (20–55% cloud cover) typically produce the most dramatic golden hour light. The sunset quality score uses the sunset period forecast to assess cloud cover, low cloud level, visibility, and precipitation. Ideal conditions are usually a mix of broken cloud and clear horizons — a fully clear sky can be less dramatic than a partly cloudy one.
Route distances, elevation gains, and walk times shown in the app are approximate figures for the most commonly used standard route to each summit, starting from the listed trailhead. They represent a typical round trip. Always carry a map and check conditions before setting out.
Late spring (May–June) and early autumn (September–October) typically offer the best balance of daylight, temperature, and trail conditions. Summer days are long but Atlantic weather fronts can move in quickly. Winter hiking is possible but requires experience — shorter days, potential ice on the Mourne Wall and granite steps, and rapidly changing summit conditions. Always check the forecast before setting out.
Slieve Donard (850 m) is graded Moderate via the standard Donard Park route from Newcastle. The path is well-maintained to the saddle between Donard and Commedagh, where it meets the Mourne Wall. The upper section is open hillside with a steeper gradient. Total distance is approximately 10.5 km with 760 m of ascent for a round trip — allow 3.5–4.5 hours. The Bloody Bridge approach is a quieter alternative on busy summer weekends.
Wild camping is generally tolerated on open hillside and summit areas above the Mourne Wall, though it is not a legal right in Northern Ireland. The Silent Valley catchment area is an exception — camping is not permitted inside the reservoir fence. Mourne Mountains Forecast includes a wild camping conditions score for each peak to help identify the best overnight windows based on wind, rain, and temperature.
The Mourne Wall is a dry-stone granite wall built between 1904 and 1922 to enclose Belfast Water Commissioners' catchment area in the heart of the Mournes. It stretches approximately 35 km and crosses over 15 summits including Slieve Donard, Slieve Commedagh, Slieve Bearnagh, and Slieve Binnian. The wall is a distinctive landmark on many summit ridges and can serve as a navigation aid — though it is no substitute for a map and compass.
Yes — the app includes a live animated rain radar powered by Rain Viewer, which aggregates data from the UK Met Office and other leading meteorological agencies, so you can see at a glance which direction rain is tracking toward the mountains.
Yes — Mourne Mountains Forecast is completely free. There are no ads, no account required, and no paywalled features. All 18 mountain forecasts, the rain radar, wild camping scores, sunset quality ratings, and offline PWA functionality are available at no cost.