Dublin records about 758mm of rain across roughly 163 wet days a year, which is a 45% chance on an average day. October is the wettest month at 77mm (10% of the annual total) and February the driest at 52mm. Local rain type: drizzle. Dublin rain is legendary — a proper waterproof jacket is more useful than an umbrella since Atlantic winds make umbrellas unreliable.
Chance of rain on an average day: 45%
Rainfall climatology for Dublin. 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 | 758mm |
| Rain days per year | 163 |
| Odds on an average day | 45% |
| Wettest month | October — 77mm over 16 days |
| Driest month | February — 52mm over 11 days |
| Rain type | drizzle |
| Best dry window | May and June are the driest months with up to 7 hours of daily sunshine and Ireland's longest days. |
| Worst rain window | October through January delivers the heaviest and most frequent rain, combined with short daylight hours. |
October delivers 48% more rain than February (77mm vs 52mm). That gap is the difference between planning around showers and ignoring them.
No single month holds more than 10% of the annual total, so rain in Dublin is spread through the year — there is no season you can rely on being dry.
Dublin rain is mostly persistent drizzle, where a waterproof shell beats an umbrella.
Rain falls on about 16 days in October against 11 in February — 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 | 70mm | 15 | 50% | 8°C |
| February | 52mm | 11 | 37% | 8°C |
| March | 54mm | 11 | 37% | 10°C |
| April | 54mm | 11 | 37% | 12°C |
| May | 60mm | 13 | 43% | 16°C |
| June | 67mm | 14 | 47% | 18°C |
| July | 57mm | 12 | 40% | 20°C |
| August | 74mm | 16 | 53% | 20°C |
| September | 61mm | 13 | 43% | 18°C |
| October | 77mm | 16 | 53% | 16°C |
| November | 73mm | 15 | 50% | 12°C |
| December | 72mm | 15 | 50% | 10°C |
Rain probability is the chance that at least 0.2mm falls at your location — not how long it rains. For Dublin 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.
Dublin records rain on roughly 163 days a year — about a 45% chance on any given day — totalling around 758mm.
October, with about 77mm over 16 rain days. That is 10% of the entire year's rainfall in a single month.
February is the driest month at 52mm across roughly 11 days. May and June are the driest months with up to 7 hours of daily sunshine and Ireland's longest days.
Dublin rain is legendary — a proper waterproof jacket is more useful than an umbrella since Atlantic winds make umbrellas unreliable.
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.