| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 5.5° | -0.3° | 61.9mm | 15.3 | 20 |
| February | 7.7° | 0.1° | 47.6mm | 11.8 | 34 |
| March | 12.3° | 1.8° | 44.9mm | 10.9 | 53 |
| April | 17° | 4.6° | 46.3mm | 9.9 | 71 |
| May | 20.5° | 8.8° | 78.6mm | 12.9 | 74 |
| June | 25.2° | 12.9° | 68mm | 12.2 | 76 |
| July | 27° | 14.4° | 77.4mm | 11.6 | 77 |
| August | 26.7° | 14.4° | 65.4mm | 11.1 | 78 |
| September | 22.3° | 10.6° | 52mm | 9.4 | 81 |
| October | 16.5° | 6.9° | 66.6mm | 12.1 | 65 |
| November | 9.9° | 3.4° | 66.8mm | 13.5 | 41 |
| December | 6.6° | 0.9° | 73.9mm | 16.6 | 25 |
January in Karlsruhe averages a daily high of 5.5°C with nights around -0.3°C. Expect roughly 15.3 wet days totalling 61.9mm. A hard month to visit for comfort alone.
February in Karlsruhe averages a daily high of 7.7°C with nights around 0.1°C. Expect roughly 11.8 wet days totalling 47.6mm. A hard month to visit for comfort alone.
March in Karlsruhe averages a daily high of 12.3°C with nights around 1.8°C. Expect roughly 10.9 wet days totalling 44.9mm. Demanding conditions — pack for it and plan indoor options.
April in Karlsruhe averages a daily high of 17°C with nights around 4.6°C. Expect roughly 9.9 wet days totalling 46.3mm. Generally workable, with some weather to plan around.
May in Karlsruhe averages a daily high of 20.5°C with nights around 8.8°C. Expect roughly 12.9 wet days totalling 78.6mm. Generally workable, with some weather to plan around.
June in Karlsruhe averages a daily high of 25.2°C with nights around 12.9°C. Expect roughly 12.2 wet days totalling 68mm. Comfortable conditions for being outdoors all day.
July in Karlsruhe averages a daily high of 27°C with nights around 14.4°C. Expect roughly 11.6 wet days totalling 77.4mm. Comfortable conditions for being outdoors all day.
August in Karlsruhe averages a daily high of 26.7°C with nights around 14.4°C. Expect roughly 11.1 wet days totalling 65.4mm. Comfortable conditions for being outdoors all day.
September in Karlsruhe averages a daily high of 22.3°C with nights around 10.6°C. Expect roughly 9.4 wet days totalling 52mm. Comfortable conditions for being outdoors all day.
October in Karlsruhe averages a daily high of 16.5°C with nights around 6.9°C. Expect roughly 12.1 wet days totalling 66.6mm. Generally workable, with some weather to plan around.
November in Karlsruhe averages a daily high of 9.9°C with nights around 3.4°C. Expect roughly 13.5 wet days totalling 66.8mm. Demanding conditions — pack for it and plan indoor options.
December in Karlsruhe averages a daily high of 6.6°C with nights around 0.9°C. Expect roughly 16.6 wet days totalling 73.9mm. 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. Karlsruhe peaks at 81.
Based on 30 years of records, May–September scores highest for comfort in Karlsruhe, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 27°C.
May is the wettest, averaging 78.6mm of rain across roughly 12.9 wet days.
January is the coolest month, with average daily highs around 5.5°C.