Cliffs of Moher records about 1200mm of rain across roughly 225 wet days a year, which is a 62% chance on an average day. December is the wettest month at 135mm (11% of the annual total) and May the driest at 70mm. Local rain type: steady rain. Umbrellas are useless on the Cliffs — Atlantic winds will invert them instantly. A high-quality waterproof jacket with a hood is essential. Rain arrives horizontally from the ocean.
Chance of rain on an average day: 62%
Rainfall climatology for Cliffs of Moher. The live hour-by-hour answer for today loads at the top of this page from Open-Meteo and refreshes through the day — the figures below describe a typical year, not today.
Last updated: · Live forecast data refreshes hourly.
| Annual rainfall | 1200mm |
| Rain days per year | 225 |
| Odds on an average day | 62% |
| Wettest month | December — 135mm over 26 days |
| Driest month | May — 70mm over 13 days |
| Rain type | steady rain |
| Best dry window | May and June offer the driest conditions with the longest days — but even then, expect at least a few showers. |
| Worst rain window | December and January bring relentless Atlantic storms — the cliffs are at their most dramatic but access may be restricted on the stormiest days. |
December delivers 93% more rain than May (135mm vs 70mm). That gap is the difference between planning around showers and ignoring them.
No single month holds more than 11% of the annual total, so rain in Cliffs of Moher is spread through the year — there is no season you can rely on being dry.
Cliffs of Moher rain typically comes as discrete showers, so a compact umbrella and a flexible plan are usually enough.
Rain falls on about 26 days in December against 13 in May — the frequency swing matters more for planning than the millimetre totals.
Climate normals. Use them to judge whether today's live forecast at the top of the page is typical or unusual for the season.
| Month | Rainfall | Rain days | Chance on a given day | Highs |
|---|---|---|---|---|
| January | 120mm | 23 | 77% | 9°C |
| February | 90mm | 17 | 57% | 9°C |
| March | 95mm | 18 | 60% | 10°C |
| April | 75mm | 14 | 47% | 12°C |
| May | 70mm | 13 | 43% | 15°C |
| June | 75mm | 14 | 47% | 17°C |
| July | 80mm | 15 | 50% | 18°C |
| August | 95mm | 18 | 60% | 18°C |
| September | 100mm | 19 | 63% | 17°C |
| October | 130mm | 25 | 83% | 15°C |
| November | 125mm | 24 | 80% | 12°C |
| December | 135mm | 26 | 87% | 10°C |
Rain probability is the chance that at least 0.2mm falls at your location — not how long it rains. For Cliffs of Moher we combine the hourly probability curve, expected volume in millimetres, and the city's own rainfall record into a single umbrella verdict.
| Factor | Weight | What it measures |
|---|---|---|
| Hourly probability | 40% | Peak and sustained chance of measurable rain across the next 24 hours. |
| Expected volume | 30% | Total millimetres, which separates a passing shower from a genuine soaking. |
| Timing & duration | 20% | When rain starts, when it eases, and the longest continuous dry window. |
| Local rain type | 10% | Drizzle, brief showers, thunderstorms or monsoon — each needs different gear. |
Live hourly values come from Open-Meteo and refresh through the day. Monthly rainfall figures are climate normals, so they describe a typical year rather than a forecast.
Cliffs of Moher records rain on roughly 225 days a year — about a 62% chance on any given day — totalling around 1200mm.
December, with about 135mm over 26 rain days. That is 11% of the entire year's rainfall in a single month.
May is the driest month at 70mm across roughly 13 days. May and June offer the driest conditions with the longest days — but even then, expect at least a few showers.
Umbrellas are useless on the Cliffs — Atlantic winds will invert them instantly. A high-quality waterproof jacket with a hood is essential. Rain arrives horizontally from the ocean.
No. Probability is the chance that at least 0.2mm of rain falls at your location at some point in the period. Check the expected millimetres alongside it: 40% with 0.4mm is a passing shower, 40% with 12mm is a soaking.