| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 2.2° | -4° | 70.1mm | 15.1 | 6 |
| February | 4.2° | -3.4° | 62.2mm | 13 | 15 |
| March | 8.1° | -1.2° | 70.9mm | 13.8 | 30 |
| April | 12.8° | 2° | 55.4mm | 12.8 | 51 |
| May | 17° | 6.1° | 97.7mm | 14.7 | 61 |
| June | 21° | 9.8° | 90.1mm | 13.7 | 73 |
| July | 22.6° | 11.1° | 101.2mm | 15 | 70 |
| August | 22.4° | 11.2° | 84.4mm | 13.7 | 73 |
| September | 17.9° | 7.4° | 63.9mm | 11.8 | 70 |
| October | 13.1° | 4.3° | 67.8mm | 12.9 | 52 |
| November | 6.5° | -0.1° | 69.6mm | 14.2 | 25 |
| December | 3° | -3° | 75.7mm | 16.7 | 8 |
January in Ulm averages a daily high of 2.2°C with nights around -4°C. Expect roughly 15.1 wet days totalling 70.1mm. A hard month to visit for comfort alone.
February in Ulm averages a daily high of 4.2°C with nights around -3.4°C. Expect roughly 13 wet days totalling 62.2mm. A hard month to visit for comfort alone.
March in Ulm averages a daily high of 8.1°C with nights around -1.2°C. Expect roughly 13.8 wet days totalling 70.9mm. A hard month to visit for comfort alone.
April in Ulm averages a daily high of 12.8°C with nights around 2°C. Expect roughly 12.8 wet days totalling 55.4mm. Demanding conditions — pack for it and plan indoor options.
May in Ulm averages a daily high of 17°C with nights around 6.1°C. Expect roughly 14.7 wet days totalling 97.7mm. Generally workable, with some weather to plan around.
June in Ulm averages a daily high of 21°C with nights around 9.8°C. Expect roughly 13.7 wet days totalling 90.1mm. Generally workable, with some weather to plan around.
July in Ulm averages a daily high of 22.6°C with nights around 11.1°C. Expect roughly 15 wet days totalling 101.2mm. Generally workable, with some weather to plan around.
August in Ulm averages a daily high of 22.4°C with nights around 11.2°C. Expect roughly 13.7 wet days totalling 84.4mm. Generally workable, with some weather to plan around.
September in Ulm averages a daily high of 17.9°C with nights around 7.4°C. Expect roughly 11.8 wet days totalling 63.9mm. Generally workable, with some weather to plan around.
October in Ulm averages a daily high of 13.1°C with nights around 4.3°C. Expect roughly 12.9 wet days totalling 67.8mm. Demanding conditions — pack for it and plan indoor options.
November in Ulm averages a daily high of 6.5°C with nights around -0.1°C. Expect roughly 14.2 wet days totalling 69.6mm. A hard month to visit for comfort alone.
December in Ulm averages a daily high of 3°C with nights around -3°C. Expect roughly 16.7 wet days totalling 75.7mm. 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. Ulm peaks at 73.
Based on 30 years of records, June–September scores highest for comfort in Ulm, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 22.6°C.
July is the wettest, averaging 101.2mm of rain across roughly 15 wet days.
January is the coolest month, with average daily highs around 2.2°C.