| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 6.6° | -0.7° | 73.5mm | 10 | 33 |
| February | 8.4° | 0.4° | 68.4mm | 9.7 | 41 |
| March | 13.1° | 4.1° | 88.6mm | 10.7 | 57 |
| April | 19.6° | 9.7° | 95.5mm | 10.9 | 77 |
| May | 24.4° | 15.1° | 89mm | 11.3 | 77 |
| June | 29.6° | 20.3° | 97.9mm | 10.4 | 69 |
| July | 32.1° | 23° | 119.3mm | 10.6 | 58 |
| August | 30.8° | 22.1° | 112.9mm | 9.4 | 66 |
| September | 27.1° | 18.6° | 115.9mm | 8.8 | 82 |
| October | 20.6° | 12° | 89.5mm | 8.2 | 84 |
| November | 14.4° | 6.3° | 71.3mm | 8.1 | 66 |
| December | 8.8° | 1.9° | 98.3mm | 10.3 | 43 |
January in Dundalk averages a daily high of 6.6°C with nights around -0.7°C. Expect roughly 10 wet days totalling 73.5mm. A hard month to visit for comfort alone.
February in Dundalk averages a daily high of 8.4°C with nights around 0.4°C. Expect roughly 9.7 wet days totalling 68.4mm. Demanding conditions — pack for it and plan indoor options.
March in Dundalk averages a daily high of 13.1°C with nights around 4.1°C. Expect roughly 10.7 wet days totalling 88.6mm. Generally workable, with some weather to plan around.
April in Dundalk averages a daily high of 19.6°C with nights around 9.7°C. Expect roughly 10.9 wet days totalling 95.5mm. Comfortable conditions for being outdoors all day.
May in Dundalk averages a daily high of 24.4°C with nights around 15.1°C. Expect roughly 11.3 wet days totalling 89mm. Comfortable conditions for being outdoors all day.
June in Dundalk averages a daily high of 29.6°C with nights around 20.3°C. Expect roughly 10.4 wet days totalling 97.9mm. Generally workable, with some weather to plan around.
July in Dundalk averages a daily high of 32.1°C with nights around 23°C. Expect roughly 10.6 wet days totalling 119.3mm. Generally workable, with some weather to plan around.
August in Dundalk averages a daily high of 30.8°C with nights around 22.1°C. Expect roughly 9.4 wet days totalling 112.9mm. Generally workable, with some weather to plan around.
September in Dundalk averages a daily high of 27.1°C with nights around 18.6°C. Expect roughly 8.8 wet days totalling 115.9mm. Comfortable conditions for being outdoors all day.
October in Dundalk averages a daily high of 20.6°C with nights around 12°C. Expect roughly 8.2 wet days totalling 89.5mm. Comfortable conditions for being outdoors all day.
November in Dundalk averages a daily high of 14.4°C with nights around 6.3°C. Expect roughly 8.1 wet days totalling 71.3mm. Generally workable, with some weather to plan around.
December in Dundalk averages a daily high of 8.8°C with nights around 1.9°C. Expect roughly 10.3 wet days totalling 98.3mm. Demanding conditions — pack for it and plan indoor options.
Each month scores out of 100. It starts at 100 and loses points for daytime highs outside a 20–27°C band, for wet days, and for nights below 2°C. Nothing else is weighted in — no crowd data, no prices, no opinion. Dundalk peaks at 84.
Based on 30 years of records, April–May scores highest for comfort in Dundalk, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 32.1°C.
July is the wettest, averaging 119.3mm of rain across roughly 10.6 wet days.
January is the coolest month, with average daily highs around 6.6°C.