| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 5.5° | 0.1° | 80.6mm | 16.4 | 21 |
| February | 7.1° | 0.5° | 72.8mm | 14.8 | 27 |
| March | 10.4° | 1.5° | 61.7mm | 13.7 | 41 |
| April | 14.9° | 3.7° | 46.4mm | 10.9 | 62 |
| May | 18.8° | 7.5° | 66.2mm | 12.8 | 71 |
| June | 21.8° | 10.6° | 68.7mm | 12 | 76 |
| July | 23.3° | 12.5° | 87.4mm | 14.2 | 72 |
| August | 23.3° | 12.4° | 84.5mm | 13.6 | 73 |
| September | 19.8° | 9.9° | 68.9mm | 12.4 | 75 |
| October | 14.9° | 7° | 75.2mm | 14.6 | 54 |
| November | 9.5° | 3.4° | 79.9mm | 16.7 | 36 |
| December | 6° | 1° | 89.1mm | 17.3 | 24 |
January in Arnhem averages a daily high of 5.5°C with nights around 0.1°C. Expect roughly 16.4 wet days totalling 80.6mm. A hard month to visit for comfort alone.
February in Arnhem averages a daily high of 7.1°C with nights around 0.5°C. Expect roughly 14.8 wet days totalling 72.8mm. A hard month to visit for comfort alone.
March in Arnhem averages a daily high of 10.4°C with nights around 1.5°C. Expect roughly 13.7 wet days totalling 61.7mm. Demanding conditions — pack for it and plan indoor options.
April in Arnhem averages a daily high of 14.9°C with nights around 3.7°C. Expect roughly 10.9 wet days totalling 46.4mm. Generally workable, with some weather to plan around.
May in Arnhem averages a daily high of 18.8°C with nights around 7.5°C. Expect roughly 12.8 wet days totalling 66.2mm. Generally workable, with some weather to plan around.
June in Arnhem averages a daily high of 21.8°C with nights around 10.6°C. Expect roughly 12 wet days totalling 68.7mm. Comfortable conditions for being outdoors all day.
July in Arnhem averages a daily high of 23.3°C with nights around 12.5°C. Expect roughly 14.2 wet days totalling 87.4mm. Generally workable, with some weather to plan around.
August in Arnhem averages a daily high of 23.3°C with nights around 12.4°C. Expect roughly 13.6 wet days totalling 84.5mm. Generally workable, with some weather to plan around.
September in Arnhem averages a daily high of 19.8°C with nights around 9.9°C. Expect roughly 12.4 wet days totalling 68.9mm. Comfortable conditions for being outdoors all day.
October in Arnhem averages a daily high of 14.9°C with nights around 7°C. Expect roughly 14.6 wet days totalling 75.2mm. Demanding conditions — pack for it and plan indoor options.
November in Arnhem averages a daily high of 9.5°C with nights around 3.4°C. Expect roughly 16.7 wet days totalling 79.9mm. Demanding conditions — pack for it and plan indoor options.
December in Arnhem averages a daily high of 6°C with nights around 1°C. Expect roughly 17.3 wet days totalling 89.1mm. 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. Arnhem peaks at 76.
Based on 30 years of records, May–September scores highest for comfort in Arnhem, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 23.3°C.
December is the wettest, averaging 89.1mm of rain across roughly 17.3 wet days.
January is the coolest month, with average daily highs around 5.5°C.