| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 12.9° | 5.7° | 185.7mm | 16.4 | 47 |
| February | 14.2° | 5.9° | 135.3mm | 14 | 53 |
| March | 16.6° | 8° | 131.8mm | 14.7 | 60 |
| April | 18.3° | 9.8° | 125.2mm | 15.3 | 65 |
| May | 21° | 12.4° | 124.2mm | 15 | 70 |
| June | 23.7° | 15.7° | 116.8mm | 13.7 | 73 |
| July | 25.4° | 18.1° | 74.4mm | 11.6 | 77 |
| August | 26.3° | 18° | 102mm | 11.8 | 76 |
| September | 24.3° | 15.5° | 146.5mm | 11.9 | 76 |
| October | 21.7° | 13° | 134.7mm | 11.9 | 76 |
| November | 16.8° | 8.9° | 254.2mm | 16.5 | 60 |
| December | 14.7° | 6.8° | 186.8mm | 15.2 | 53 |
January in Irun averages a daily high of 12.9°C with nights around 5.7°C. Expect roughly 16.4 wet days totalling 185.7mm. Demanding conditions — pack for it and plan indoor options.
February in Irun averages a daily high of 14.2°C with nights around 5.9°C. Expect roughly 14 wet days totalling 135.3mm. Demanding conditions — pack for it and plan indoor options.
March in Irun averages a daily high of 16.6°C with nights around 8°C. Expect roughly 14.7 wet days totalling 131.8mm. Generally workable, with some weather to plan around.
April in Irun averages a daily high of 18.3°C with nights around 9.8°C. Expect roughly 15.3 wet days totalling 125.2mm. Generally workable, with some weather to plan around.
May in Irun averages a daily high of 21°C with nights around 12.4°C. Expect roughly 15 wet days totalling 124.2mm. Generally workable, with some weather to plan around.
June in Irun averages a daily high of 23.7°C with nights around 15.7°C. Expect roughly 13.7 wet days totalling 116.8mm. Generally workable, with some weather to plan around.
July in Irun averages a daily high of 25.4°C with nights around 18.1°C. Expect roughly 11.6 wet days totalling 74.4mm. Comfortable conditions for being outdoors all day.
August in Irun averages a daily high of 26.3°C with nights around 18°C. Expect roughly 11.8 wet days totalling 102mm. Comfortable conditions for being outdoors all day.
September in Irun averages a daily high of 24.3°C with nights around 15.5°C. Expect roughly 11.9 wet days totalling 146.5mm. Comfortable conditions for being outdoors all day.
October in Irun averages a daily high of 21.7°C with nights around 13°C. Expect roughly 11.9 wet days totalling 134.7mm. Comfortable conditions for being outdoors all day.
November in Irun averages a daily high of 16.8°C with nights around 8.9°C. Expect roughly 16.5 wet days totalling 254.2mm. Generally workable, with some weather to plan around.
December in Irun averages a daily high of 14.7°C with nights around 6.8°C. Expect roughly 15.2 wet days totalling 186.8mm. 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. Irun peaks at 77.
Based on 30 years of records, May–October scores highest for comfort in Irun, balancing daytime temperature against rainfall.
August is the warmest, averaging a daily high of 26.3°C.
November is the wettest, averaging 254.2mm of rain across roughly 16.5 wet days.
January is the coolest month, with average daily highs around 12.9°C.