Ireland Mountain Forecast | Summit Outlook

Summit arrival12:00 pm

Clear windows within 1 hour either side.

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Arrival flexibility

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Today’s Mountain Forecast

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About this forecast

Summit Outlook estimates how clear the view may be from each destination using GFS weather forecasts from Open-Meteo. It considers the mountain’s location and elevation, how much moisture is in the air around the summit, expected visibility, and rain or snow.

What the ratings mean

Good view: Conditions suggest a lower chance of cloud around the summit and better visibility.
Mixed view: Some conditions could reduce the view—for example, moist air near the summit or light rain or snow.
Poor view: Conditions suggest a higher chance of the summit being in cloud, limited visibility, or heavier precipitation.

A clear window is at least one continuous hour during daylight with a Good view rating. A mountain can have a good view even when the sky overhead is cloudy.

How reliable is it?

These are estimates, not guarantees or live observations. The forecast uses a broad model of the atmosphere and terrain, so it can miss local cloud, thin cloud layers, or rapid changes. The visibility data may describe the surrounding area rather than the summit itself. Conditions can also change between updates. Nighttime ratings describe atmospheric conditions, not daylight views.

Forecast details

Forecasts normally update around 1 am, 7 am, 1 pm, and 7 pm Irish time. Updates can be delayed; the site flags an older forecast.
All times are in Ireland time: GMT in winter and Irish Standard Time (IST) in summer.
Sunrise and sunset use the latest sunrise and earliest sunset across the listed destinations.
Forecast locations cover the Republic of Ireland and Northern Ireland; all times are local Irish time.

More about the calculations

The ratings use forecast humidity at and near the destination’s elevation, model visibility, and hourly precipitation:

Good: humidity below 85% at and near the summit, visibility of at least 10 km, and less than 0.1 mm of precipitation per hour.
Poor: summit humidity of at least 95%, visibility below 5 km, or at least 1 mm of precipitation per hour.
Mixed: conditions between those thresholds.

Occasionally an atmospheric layer does not cover a summit; those hours are marked unavailable with a question mark. Ireland uses the global GFS model, whose grid can miss local mountain conditions. We estimate humidity at the summit’s elevation from forecast atmospheric layers, and check the most humid air within 150 metres above or below it. Humidity helps estimate the risk of cloud around the summit; it does not directly measure cloud. These thresholds are practical planning estimates, not calibrated probabilities.