| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 0.7° | -4.3° | 48.4mm | 14.4 | 7 |
| February | 1.6° | -4.3° | 39.3mm | 11.7 | 12 |
| March | 5.2° | -2.6° | 31.7mm | 10 | 26 |
| April | 11.1° | 0.7° | 34.4mm | 8.7 | 52 |
| May | 16.7° | 5.4° | 45.1mm | 10.5 | 68 |
| June | 21.1° | 10.3° | 64.7mm | 11.3 | 77 |
| July | 23.2° | 13.1° | 74mm | 11.8 | 76 |
| August | 22.1° | 12.3° | 73mm | 12.6 | 75 |
| September | 17° | 8.4° | 54.2mm | 10.9 | 69 |
| October | 10.5° | 4.1° | 61.5mm | 12.9 | 44 |
| November | 5.4° | 0.9° | 58.4mm | 15.5 | 22 |
| December | 1.9° | -2.8° | 57.4mm | 16.3 | 8 |
January in Södertälje averages a daily high of 0.7°C with nights around -4.3°C. Expect roughly 14.4 wet days totalling 48.4mm. A hard month to visit for comfort alone.
February in Södertälje averages a daily high of 1.6°C with nights around -4.3°C. Expect roughly 11.7 wet days totalling 39.3mm. A hard month to visit for comfort alone.
March in Södertälje averages a daily high of 5.2°C with nights around -2.6°C. Expect roughly 10 wet days totalling 31.7mm. A hard month to visit for comfort alone.
April in Södertälje averages a daily high of 11.1°C with nights around 0.7°C. Expect roughly 8.7 wet days totalling 34.4mm. Demanding conditions — pack for it and plan indoor options.
May in Södertälje averages a daily high of 16.7°C with nights around 5.4°C. Expect roughly 10.5 wet days totalling 45.1mm. Generally workable, with some weather to plan around.
June in Södertälje averages a daily high of 21.1°C with nights around 10.3°C. Expect roughly 11.3 wet days totalling 64.7mm. Comfortable conditions for being outdoors all day.
July in Södertälje averages a daily high of 23.2°C with nights around 13.1°C. Expect roughly 11.8 wet days totalling 74mm. Comfortable conditions for being outdoors all day.
August in Södertälje averages a daily high of 22.1°C with nights around 12.3°C. Expect roughly 12.6 wet days totalling 73mm. Comfortable conditions for being outdoors all day.
September in Södertälje averages a daily high of 17°C with nights around 8.4°C. Expect roughly 10.9 wet days totalling 54.2mm. Generally workable, with some weather to plan around.
October in Södertälje averages a daily high of 10.5°C with nights around 4.1°C. Expect roughly 12.9 wet days totalling 61.5mm. Demanding conditions — pack for it and plan indoor options.
November in Södertälje averages a daily high of 5.4°C with nights around 0.9°C. Expect roughly 15.5 wet days totalling 58.4mm. A hard month to visit for comfort alone.
December in Södertälje averages a daily high of 1.9°C with nights around -2.8°C. Expect roughly 16.3 wet days totalling 57.4mm. 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. Södertälje peaks at 77.
Based on 30 years of records, June–September scores highest for comfort in Södertälje, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 23.2°C.
July is the wettest, averaging 74mm of rain across roughly 11.8 wet days.
January is the coolest month, with average daily highs around 0.7°C.