| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 0.9° | -3.9° | 77.1mm | 13.9 | 8 |
| February | 1.7° | -3.5° | 60mm | 11.6 | 14 |
| March | 5.4° | -1.7° | 43mm | 8.9 | 30 |
| April | 11.2° | 2.3° | 47.7mm | 9.1 | 54 |
| May | 16.5° | 7.3° | 57.3mm | 11.3 | 66 |
| June | 20.3° | 11.6° | 67.6mm | 10.4 | 79 |
| July | 22° | 13.9° | 77.9mm | 12.1 | 76 |
| August | 21.2° | 13.3° | 88.6mm | 12.1 | 76 |
| September | 16.7° | 9.8° | 87.2mm | 11.5 | 66 |
| October | 10.8° | 5.4° | 109.1mm | 14.3 | 42 |
| November | 5.7° | 1.2° | 95.6mm | 14.5 | 24 |
| December | 2° | -2.8° | 84.8mm | 14.7 | 8 |
January in Sarpsborg averages a daily high of 0.9°C with nights around -3.9°C. Expect roughly 13.9 wet days totalling 77.1mm. A hard month to visit for comfort alone.
February in Sarpsborg averages a daily high of 1.7°C with nights around -3.5°C. Expect roughly 11.6 wet days totalling 60mm. A hard month to visit for comfort alone.
March in Sarpsborg averages a daily high of 5.4°C with nights around -1.7°C. Expect roughly 8.9 wet days totalling 43mm. A hard month to visit for comfort alone.
April in Sarpsborg averages a daily high of 11.2°C with nights around 2.3°C. Expect roughly 9.1 wet days totalling 47.7mm. Demanding conditions — pack for it and plan indoor options.
May in Sarpsborg averages a daily high of 16.5°C with nights around 7.3°C. Expect roughly 11.3 wet days totalling 57.3mm. Generally workable, with some weather to plan around.
June in Sarpsborg averages a daily high of 20.3°C with nights around 11.6°C. Expect roughly 10.4 wet days totalling 67.6mm. Comfortable conditions for being outdoors all day.
July in Sarpsborg averages a daily high of 22°C with nights around 13.9°C. Expect roughly 12.1 wet days totalling 77.9mm. Comfortable conditions for being outdoors all day.
August in Sarpsborg averages a daily high of 21.2°C with nights around 13.3°C. Expect roughly 12.1 wet days totalling 88.6mm. Comfortable conditions for being outdoors all day.
September in Sarpsborg averages a daily high of 16.7°C with nights around 9.8°C. Expect roughly 11.5 wet days totalling 87.2mm. Generally workable, with some weather to plan around.
October in Sarpsborg averages a daily high of 10.8°C with nights around 5.4°C. Expect roughly 14.3 wet days totalling 109.1mm. Demanding conditions — pack for it and plan indoor options.
November in Sarpsborg averages a daily high of 5.7°C with nights around 1.2°C. Expect roughly 14.5 wet days totalling 95.6mm. A hard month to visit for comfort alone.
December in Sarpsborg averages a daily high of 2°C with nights around -2.8°C. Expect roughly 14.7 wet days totalling 84.8mm. 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. Sarpsborg peaks at 79.
Based on 30 years of records, June–August scores highest for comfort in Sarpsborg, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 22°C.
October is the wettest, averaging 109.1mm of rain across roughly 14.3 wet days.
January is the coolest month, with average daily highs around 0.9°C.