| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 0.8° | -4.2° | 24.5mm | 6.3 | 23 |
| February | 1.5° | -4.3° | 34.2mm | 12.3 | 11 |
| March | 5.1° | -2.5° | 27.7mm | 8 | 30 |
| April | 10.8° | 1° | 46.3mm | 8 | 53 |
| May | 16.4° | 5.8° | 49.2mm | 11 | 66 |
| June | 20.9° | 10.7° | 66.5mm | 10 | 80 |
| July | 23.2° | 13.5° | 40.7mm | 8.7 | 83 |
| August | 22.1° | 12.8° | 31.5mm | 6 | 88 |
| September | 17.1° | 8.9° | 57.5mm | 11.7 | 67 |
| October | 10.7° | 4.5° | 29.1mm | 12.7 | 45 |
| November | 5.5° | 0.9° | 55.4mm | 14.7 | 23 |
| December | 2.1° | -2.7° | 25.4mm | 14 | 10 |
January in Sollentuna averages a daily high of 0.8°C with nights around -4.2°C. Expect roughly 6.3 wet days totalling 24.5mm. A hard month to visit for comfort alone.
February in Sollentuna averages a daily high of 1.5°C with nights around -4.3°C. Expect roughly 12.3 wet days totalling 34.2mm. A hard month to visit for comfort alone.
March in Sollentuna averages a daily high of 5.1°C with nights around -2.5°C. Expect roughly 8 wet days totalling 27.7mm. A hard month to visit for comfort alone.
April in Sollentuna averages a daily high of 10.8°C with nights around 1°C. Expect roughly 8 wet days totalling 46.3mm. Demanding conditions — pack for it and plan indoor options.
May in Sollentuna averages a daily high of 16.4°C with nights around 5.8°C. Expect roughly 11 wet days totalling 49.2mm. Generally workable, with some weather to plan around.
June in Sollentuna averages a daily high of 20.9°C with nights around 10.7°C. Expect roughly 10 wet days totalling 66.5mm. Comfortable conditions for being outdoors all day.
July in Sollentuna averages a daily high of 23.2°C with nights around 13.5°C. Expect roughly 8.7 wet days totalling 40.7mm. Comfortable conditions for being outdoors all day.
August in Sollentuna averages a daily high of 22.1°C with nights around 12.8°C. Expect roughly 6 wet days totalling 31.5mm. Comfortable conditions for being outdoors all day.
September in Sollentuna averages a daily high of 17.1°C with nights around 8.9°C. Expect roughly 11.7 wet days totalling 57.5mm. Generally workable, with some weather to plan around.
October in Sollentuna averages a daily high of 10.7°C with nights around 4.5°C. Expect roughly 12.7 wet days totalling 29.1mm. Demanding conditions — pack for it and plan indoor options.
November in Sollentuna averages a daily high of 5.5°C with nights around 0.9°C. Expect roughly 14.7 wet days totalling 55.4mm. A hard month to visit for comfort alone.
December in Sollentuna averages a daily high of 2.1°C with nights around -2.7°C. Expect roughly 14 wet days totalling 25.4mm. 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. Sollentuna peaks at 88.
Based on 30 years of records, June–August scores highest for comfort in Sollentuna, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 23.2°C.
June is the wettest, averaging 66.5mm of rain across roughly 10 wet days.
January is the coolest month, with average daily highs around 0.8°C.