| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | -4.2° | -9.6° | 286.2mm | 15.7 | 0 |
| February | -4.3° | -9.6° | 238.3mm | 14.4 | 1 |
| March | -3° | -7.9° | 266.2mm | 15.7 | 0 |
| April | -0.6° | -5.1° | 174.9mm | 15.1 | 4 |
| May | 3.4° | -1.2° | 237.2mm | 18 | 12 |
| June | 7.5° | 2.5° | 235.8mm | 18.4 | 30 |
| July | 9.4° | 4.2° | 276.6mm | 18.3 | 36 |
| August | 9.7° | 4.6° | 278.4mm | 17.6 | 37 |
| September | 6.4° | 1.5° | 214.3mm | 14.9 | 26 |
| October | 4.2° | -0.7° | 191mm | 13.1 | 19 |
| November | -0.6° | -5.6° | 216.6mm | 14.6 | 4 |
| December | -3.1° | -8.3° | 289mm | 16.5 | 0 |
January in Sankt Gallen averages a daily high of -4.2°C with nights around -9.6°C. Expect roughly 15.7 wet days totalling 286.2mm. A hard month to visit for comfort alone.
February in Sankt Gallen averages a daily high of -4.3°C with nights around -9.6°C. Expect roughly 14.4 wet days totalling 238.3mm. A hard month to visit for comfort alone.
March in Sankt Gallen averages a daily high of -3°C with nights around -7.9°C. Expect roughly 15.7 wet days totalling 266.2mm. A hard month to visit for comfort alone.
April in Sankt Gallen averages a daily high of -0.6°C with nights around -5.1°C. Expect roughly 15.1 wet days totalling 174.9mm. A hard month to visit for comfort alone.
May in Sankt Gallen averages a daily high of 3.4°C with nights around -1.2°C. Expect roughly 18 wet days totalling 237.2mm. A hard month to visit for comfort alone.
June in Sankt Gallen averages a daily high of 7.5°C with nights around 2.5°C. Expect roughly 18.4 wet days totalling 235.8mm. A hard month to visit for comfort alone.
July in Sankt Gallen averages a daily high of 9.4°C with nights around 4.2°C. Expect roughly 18.3 wet days totalling 276.6mm. Demanding conditions — pack for it and plan indoor options.
August in Sankt Gallen averages a daily high of 9.7°C with nights around 4.6°C. Expect roughly 17.6 wet days totalling 278.4mm. Demanding conditions — pack for it and plan indoor options.
September in Sankt Gallen averages a daily high of 6.4°C with nights around 1.5°C. Expect roughly 14.9 wet days totalling 214.3mm. A hard month to visit for comfort alone.
October in Sankt Gallen averages a daily high of 4.2°C with nights around -0.7°C. Expect roughly 13.1 wet days totalling 191mm. A hard month to visit for comfort alone.
November in Sankt Gallen averages a daily high of -0.6°C with nights around -5.6°C. Expect roughly 14.6 wet days totalling 216.6mm. A hard month to visit for comfort alone.
December in Sankt Gallen averages a daily high of -3.1°C with nights around -8.3°C. Expect roughly 16.5 wet days totalling 289mm. 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. Sankt Gallen peaks at 37.
Based on 30 years of records, June–August scores highest for comfort in Sankt Gallen, balancing daytime temperature against rainfall.
August is the warmest, averaging a daily high of 9.7°C.
December is the wettest, averaging 289mm of rain across roughly 16.5 wet days.
February is the coolest month, with average daily highs around -4.3°C.