| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 11.4° | 4.4° | 210.4mm | 18.3 | 42 |
| February | 12.9° | 4.3° | 150.3mm | 14.4 | 48 |
| March | 15.3° | 5.6° | 161mm | 15.1 | 55 |
| April | 17.1° | 6.7° | 136.5mm | 14.8 | 61 |
| May | 19.7° | 8.9° | 106.6mm | 13.3 | 72 |
| June | 22.6° | 11.6° | 63.2mm | 8.6 | 83 |
| July | 24.7° | 13.3° | 41.8mm | 7.6 | 85 |
| August | 25.1° | 13.6° | 52.2mm | 7.3 | 85 |
| September | 23.1° | 12.2° | 87.1mm | 10 | 80 |
| October | 19° | 10.3° | 224.6mm | 16.4 | 67 |
| November | 14.1° | 6.8° | 223.2mm | 18 | 51 |
| December | 12.2° | 5.2° | 234.2mm | 17.9 | 45 |
January in Santiago de Compostela averages a daily high of 11.4°C with nights around 4.4°C. Expect roughly 18.3 wet days totalling 210.4mm. Demanding conditions — pack for it and plan indoor options.
February in Santiago de Compostela averages a daily high of 12.9°C with nights around 4.3°C. Expect roughly 14.4 wet days totalling 150.3mm. Demanding conditions — pack for it and plan indoor options.
March in Santiago de Compostela averages a daily high of 15.3°C with nights around 5.6°C. Expect roughly 15.1 wet days totalling 161mm. Generally workable, with some weather to plan around.
April in Santiago de Compostela averages a daily high of 17.1°C with nights around 6.7°C. Expect roughly 14.8 wet days totalling 136.5mm. Generally workable, with some weather to plan around.
May in Santiago de Compostela averages a daily high of 19.7°C with nights around 8.9°C. Expect roughly 13.3 wet days totalling 106.6mm. Generally workable, with some weather to plan around.
June in Santiago de Compostela averages a daily high of 22.6°C with nights around 11.6°C. Expect roughly 8.6 wet days totalling 63.2mm. Comfortable conditions for being outdoors all day.
July in Santiago de Compostela averages a daily high of 24.7°C with nights around 13.3°C. Expect roughly 7.6 wet days totalling 41.8mm. Comfortable conditions for being outdoors all day.
August in Santiago de Compostela averages a daily high of 25.1°C with nights around 13.6°C. Expect roughly 7.3 wet days totalling 52.2mm. Comfortable conditions for being outdoors all day.
September in Santiago de Compostela averages a daily high of 23.1°C with nights around 12.2°C. Expect roughly 10 wet days totalling 87.1mm. Comfortable conditions for being outdoors all day.
October in Santiago de Compostela averages a daily high of 19°C with nights around 10.3°C. Expect roughly 16.4 wet days totalling 224.6mm. Generally workable, with some weather to plan around.
November in Santiago de Compostela averages a daily high of 14.1°C with nights around 6.8°C. Expect roughly 18 wet days totalling 223.2mm. Demanding conditions — pack for it and plan indoor options.
December in Santiago de Compostela averages a daily high of 12.2°C with nights around 5.2°C. Expect roughly 17.9 wet days totalling 234.2mm. 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. Santiago de Compostela peaks at 85.
Based on 30 years of records, June–September scores highest for comfort in Santiago de Compostela, balancing daytime temperature against rainfall.
August is the warmest, averaging a daily high of 25.1°C.
December is the wettest, averaging 234.2mm of rain across roughly 17.9 wet days.
January is the coolest month, with average daily highs around 11.4°C.