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Ireland's Atlantic climate delivers 1000-1400mm of annual rainfall and strong westerly winds. Construction programmes need location-specific weather intelligence to manage persistent disruption from rain, wind, and waterlogged ground.
Ireland's climate is dominated by the Atlantic Ocean. Prevailing westerly winds bring frequent rainfall, persistent cloud cover, and mild temperatures year-round. Annual rainfall ranges from 1000mm on the east coast to over 1400mm in western counties, with mountainous areas exceeding 2000mm. The west coast experiences rain on 200 or more days per year.
While winters are mild by northern European standards, with frost relatively uncommon at low elevations, the combination of high rainfall and poor drainage creates persistently waterlogged ground conditions that severely impact earthworks and foundations. Atlantic storm systems regularly bring wind gusts exceeding 100 km/h, particularly along the western seaboard.
Limited daylight hours from November to February further compress the available working window during winter. WeatherWise analyses the full historical record at your exact site coordinates to quantify these overlapping risks and identify the most productive construction periods.
Six critical weather risks affecting construction across the island of Ireland.
Western counties see rain on 200+ days per year, disrupting earthworks, drainage installation, and concrete activities. Even eastern sites average 150+ rain days annually, requiring careful programme planning around precipitation windows.
Deep Atlantic low-pressure systems bring sustained high winds and heavy rainfall, particularly from October to March. Named storms can halt all site operations for days, with gusts exceeding safe limits for crane operations and exposed work.
Persistent rainfall combined with clay-heavy soils and poor natural drainage creates waterlogged conditions that prevent excavation and foundation work. Sites may remain unworkable for weeks after heavy rain periods, especially in lowland areas.
Coastal construction projects face significantly higher wind exposure, with mean wind speeds along the Atlantic coast exceeding inland areas by 30-50%. Tower crane operations, scaffolding work, and roofing activities are particularly affected.
December and January provide fewer than 8 hours of daylight across Ireland. Combined with frequent overcast skies, this compresses the productive working day and increases reliance on artificial lighting for safe operations.
Ireland experiences high cloud cover throughout the year, affecting solar-dependent activities and drying times. Combined with high humidity, this slows material curing, paint drying, and other finishes that require dry atmospheric conditions.
Weather risk varies significantly across Ireland. Here are the key construction markets and their climate challenges.
Dublin is one of Ireland's drier locations with around 730mm of annual rainfall and roughly 150 rain days per year. Its east coast position provides some shelter from Atlantic systems. However, persistent drizzle still disrupts earthworks, and easterly winds in winter bring cold snaps and occasional snow.
Cork receives approximately 1200mm of rainfall annually with over 170 rain days. Its southern location means milder winters with few frost days, but the Lee Valley is prone to river flooding. Proximity to the Atlantic brings strong south-westerly winds that affect high-rise and exposed site operations.
Galway is one of Ireland's wettest cities, receiving over 1150mm of rainfall annually with 200+ rain days. Fully exposed to the Atlantic, it experiences strong westerly winds and named storms from October to March. Waterlogged ground conditions persist for much of the year.
Limerick receives around 950mm of rainfall annually. Its position on the Shannon Estuary exposes it to Atlantic weather while the river creates significant flood risk. Wind speeds are elevated due to the funnelling effect of the estuary, particularly during winter storms.
Waterford is one of the sunnier Irish cities with around 1000mm of annual rainfall. Its south-eastern position provides relative shelter from the worst Atlantic systems. However, the River Suir creates flood risk, and coastal proximity means salt spray exposure on projects near the harbour.
Belfast receives approximately 850mm of annual rainfall. Its lough-side location creates particular wind exposure patterns, and the surrounding hills can channel wind into the city centre. Winter frost days average 30-40 per year, more than most Republic of Ireland cities.
Ireland is home to major construction projects where weather risk management is critical. Dublin MetroLink, the planned underground rail line, involves extensive tunnelling and surface works exposed to Dublin's variable weather. The National Children's Hospital in Dublin is one of Europe's largest hospital construction projects. Project Ireland 2040, the government's infrastructure programme, spans transport, housing, and utilities across the entire island, requiring weather planning for diverse conditions from Atlantic-battered western coasts to the relatively sheltered east.
Four steps from historical climate records to construction-ready weather intelligence for any Irish project.
ERA-5 reanalysis data covers all counties across the Republic of Ireland and Northern Ireland. Analyse weather risk at any coordinate pair on the island with 45+ years of consistent historical data at hourly resolution.
Analyse rainfall intensity, cumulative precipitation, wind speed and gusts, temperature, humidity, visibility, and more. Set activity-specific thresholds that reflect the real conditions your teams work in.
Generate working day calendars tailored to each construction activity. Earthworks, crane lifts, concrete pours, and roofing each have different weather sensitivities. WeatherWise models each one independently.
Export weather calendars directly to Primavera P6, Asta Powerproject, or Microsoft Project. Integrate probabilistic weather risk into your programme from day one rather than reacting to delays after they occur.
Ireland receives between 1000mm and 1400mm of rainfall annually, with western counties exceeding 1600mm. Rain falls on over 200 days per year in the west and 150+ days in the east. This persistent rainfall disrupts earthworks, excavation, concrete pours, and any activity requiring dry ground conditions. WeatherWise quantifies the probability of rain exceeding your specific thresholds for each month of the year.
April to September offers the best working conditions, with May and June typically being the driest months. However, even in summer, Ireland averages 8-12 rain days per month. WeatherWise generates month-by-month working day calendars so you can identify the optimal windows for weather-sensitive activities at your specific project location.
Western Ireland faces significantly more rainfall, stronger winds, and greater Atlantic storm exposure than the east. Counties like Galway and Kerry can receive twice the annual rainfall of Dublin. Wind speeds are also substantially higher on the Atlantic coast. EHAB provides location-specific data so your risk assessment reflects the actual conditions at your site rather than national averages.
Yes. EHAB provides ERA-5 reanalysis data coverage for all counties in both the Republic of Ireland and Northern Ireland. You can analyse weather risk at any coordinate pair across the entire island, with the same 45+ years of historical data and 80+ weather variables available for every location.
EHAB uses ERA-5 reanalysis data from ECMWF, which assimilates observations from Met Eireann stations along with satellite and other data sources into a physically consistent global model. This provides complete spatial coverage at any coordinate rather than being limited to station locations. ERA-5 data is available at hourly resolution with 80+ variables, offering broader coverage than station networks alone.
Maritime climate with rainfall, frost, and winter storms.
Pan-European coverage from Mediterranean to Nordic climates.
Hurricanes, blizzards, and extreme temperature ranges.
Generate day-by-day working day calendars for any location.
Short and medium-range forecasts for construction planning.
Get location-specific weather intelligence for any construction site across Ireland. See how WeatherWise quantifies risk and protects your programme.
