| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 7.2° | 1.7° | 85.3mm | 19 | 29 |
| February | 8.2° | 1.8° | 70.6mm | 17 | 32 |
| March | 9.5° | 2.6° | 61.9mm | 15.4 | 36 |
| April | 11.8° | 3.9° | 55.6mm | 14.3 | 45 |
| May | 14.9° | 6.3° | 62.9mm | 15.4 | 54 |
| June | 17.1° | 9.1° | 71.6mm | 14.9 | 61 |
| July | 18.7° | 10.9° | 76.8mm | 17.4 | 66 |
| August | 18.6° | 11° | 79.2mm | 16.3 | 66 |
| September | 16.2° | 9.3° | 71.3mm | 15.5 | 58 |
| October | 13° | 6.6° | 103.3mm | 19 | 48 |
| November | 9.8° | 4° | 102.1mm | 19 | 37 |
| December | 8° | 2° | 89.5mm | 19.6 | 32 |
January in Lisburn averages a daily high of 7.2°C with nights around 1.7°C. Expect roughly 19 wet days totalling 85.3mm. A hard month to visit for comfort alone.
February in Lisburn averages a daily high of 8.2°C with nights around 1.8°C. Expect roughly 17 wet days totalling 70.6mm. A hard month to visit for comfort alone.
March in Lisburn averages a daily high of 9.5°C with nights around 2.6°C. Expect roughly 15.4 wet days totalling 61.9mm. Demanding conditions — pack for it and plan indoor options.
April in Lisburn averages a daily high of 11.8°C with nights around 3.9°C. Expect roughly 14.3 wet days totalling 55.6mm. Demanding conditions — pack for it and plan indoor options.
May in Lisburn averages a daily high of 14.9°C with nights around 6.3°C. Expect roughly 15.4 wet days totalling 62.9mm. Demanding conditions — pack for it and plan indoor options.
June in Lisburn averages a daily high of 17.1°C with nights around 9.1°C. Expect roughly 14.9 wet days totalling 71.6mm. Generally workable, with some weather to plan around.
July in Lisburn averages a daily high of 18.7°C with nights around 10.9°C. Expect roughly 17.4 wet days totalling 76.8mm. Generally workable, with some weather to plan around.
August in Lisburn averages a daily high of 18.6°C with nights around 11°C. Expect roughly 16.3 wet days totalling 79.2mm. Generally workable, with some weather to plan around.
September in Lisburn averages a daily high of 16.2°C with nights around 9.3°C. Expect roughly 15.5 wet days totalling 71.3mm. Generally workable, with some weather to plan around.
October in Lisburn averages a daily high of 13°C with nights around 6.6°C. Expect roughly 19 wet days totalling 103.3mm. Demanding conditions — pack for it and plan indoor options.
November in Lisburn averages a daily high of 9.8°C with nights around 4°C. Expect roughly 19 wet days totalling 102.1mm. Demanding conditions — pack for it and plan indoor options.
December in Lisburn averages a daily high of 8°C with nights around 2°C. Expect roughly 19.6 wet days totalling 89.5mm. A hard month to visit for comfort alone.
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. Lisburn peaks at 66.
Based on 30 years of records, June–September scores highest for comfort in Lisburn, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 18.7°C.
October is the wettest, averaging 103.3mm of rain across roughly 19 wet days.
January is the coolest month, with average daily highs around 7.2°C.