The best time to visit Dublin is June, July and August, when the city sees its warmest average highs and longest daylight — June reaches 17.8 °C, July 19.4 °C and August 19.1 °C, with sunshine running around 10 to 11 hours a day. Rain is a year-round companion, so expect 14 rain days in June and July and 15 in August even at the peak. July and August coincide with school holidays and busy weeks, making them the priciest and most crowded stretch, while winter from December to February is the quiet low season with short, grey days and highs near 8 to 9 °C.
Best months JuneJulyAugust
Dublin month by month
Average highs and lows (°C), 2016–2025. Highlighted bars are the best months.
| Month | High | Low | Rain days | Sun / day |
|---|---|---|---|---|
| January | 8.3 °C | 3.8 °C | 12 | 4.1 h |
| February | 9.3 °C | 4.3 °C | 14 | 5.2 h |
| March | 10.3 °C | 4.7 °C | 14 | 7.1 h |
| April | 11.7 °C | 5.9 °C | 12 | 9.1 h |
| May | 15.2 °C | 8.9 °C | 12 | 11.3 h |
| June | 17.8 °C | 11.6 °C | 14 | 11.2 h |
| July | 19.4 °C | 13.3 °C | 14 | 10.1 h |
| August | 19.1 °C | 13.2 °C | 15 | 9.9 h |
| September | 17 °C | 11.4 °C | 14 | 8.1 h |
| October | 14.1 °C | 9.4 °C | 15 | 6.1 h |
| November | 10.7 °C | 6.4 °C | 13 | 4.5 h |
| December | 9.3 °C | 5.1 °C | 14 | 3.4 h |
How the months are picked.A month qualifies when its average high sits in the comfortable 20–28 °C band (scored down towards 9 °C and 37 °C), rain days are few and sunshine hours are high — at least 78 % of the city's best-scoring month. July and August are then set aside as peak season (school-holiday crowds and prices) whenever at least three other months qualify; where summer is the only comfortable window they stay. Figures are ten-year averages (2016-01-01 to 2025-12-31) from ERA5 reanalysis data via Open-Meteo (CC BY 4.0) for the city centre coordinates.
When to go, and what to expect
Spring (Mar–May)
A fine shoulder choice for lengthening days and lighter crowds before the peak.
Summer (Jun–Aug)
The best overall time to visit; book ahead and pack for occasional showers.
Autumn (Sep–Nov)
Good early on for mild days and fewer visitors; grows damp and dark later.
Winter (Dec–Feb)
For festive atmosphere and cosy pubs rather than sightseeing weather.
Notable events
- March
- St Patrick's Festival
- June
- Bloomsday (celebrating James Joyce's Ulysses)
- September to October
- Dublin Theatre Festival
- December
- Christmas markets and New Year Festival
Frequently asked
Is Dublin too hot in August?
No — August is mild rather than hot, with an average high of 19.1 °C. Expect showers too, as it sees 15 rain days, the most of any month.
What is the rainiest month in Dublin?
Rain is spread through the year, but August and October are wettest at 15 rain days each. Even the drier months like January and April still see 12 rain days, so bring a waterproof whenever you go.
Is winter worth visiting Dublin?
Winter is the quiet, atmospheric low season. Highs sit around 8.3 °C in January with only 3.4 to 4.1 hours of sunshine a day, so it suits festive city breaks and pub culture more than sightseeing.
Know when to go? Now decide where to stay — our Dublin area guide →
Areas of Dublin
Best time to visit near here
Sources
- Open-Meteo historical weather API — monthly climate normals, 2016–2025 (CC BY 4.0)
- ERA5 reanalysis (ECMWF / Copernicus) — the underlying temperature, precipitation and sunshine data
- ReasonStay methodology — how the best months are computed and checked
An independent guide to Dublin — honest, verified, no invented data. Climate figures: ERA5 via Open-Meteo, 2016–2025 averages; the best months are computed from them, not opinion.