| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 0° | -4.8° | 60.2mm | 13.5 | 8 |
| February | 1.4° | -4.4° | 50.2mm | 11.2 | 13 |
| March | 5.5° | -2.1° | 41mm | 8.5 | 30 |
| April | 11.1° | 2.1° | 48.3mm | 10 | 52 |
| May | 16.7° | 6.8° | 63.8mm | 12.5 | 64 |
| June | 20.8° | 11.1° | 83.3mm | 12.9 | 74 |
| July | 22.7° | 13.4° | 94.7mm | 14.4 | 71 |
| August | 21.6° | 12.7° | 104.9mm | 13.3 | 73 |
| September | 16.7° | 9° | 85.4mm | 11.1 | 67 |
| October | 10° | 4.2° | 97.2mm | 13.2 | 42 |
| November | 4.6° | 0.1° | 76.9mm | 13.7 | 20 |
| December | 0.7° | -3.9° | 53.2mm | 13.2 | 10 |
January in Oslo averages a daily high of 0°C with nights around -4.8°C. Expect roughly 13.5 wet days totalling 60.2mm. A hard month to visit for comfort alone.
February in Oslo averages a daily high of 1.4°C with nights around -4.4°C. Expect roughly 11.2 wet days totalling 50.2mm. A hard month to visit for comfort alone.
March in Oslo averages a daily high of 5.5°C with nights around -2.1°C. Expect roughly 8.5 wet days totalling 41mm. A hard month to visit for comfort alone.
April in Oslo averages a daily high of 11.1°C with nights around 2.1°C. Expect roughly 10 wet days totalling 48.3mm. Demanding conditions — pack for it and plan indoor options.
May in Oslo averages a daily high of 16.7°C with nights around 6.8°C. Expect roughly 12.5 wet days totalling 63.8mm. Generally workable, with some weather to plan around.
June in Oslo averages a daily high of 20.8°C with nights around 11.1°C. Expect roughly 12.9 wet days totalling 83.3mm. Generally workable, with some weather to plan around.
July in Oslo averages a daily high of 22.7°C with nights around 13.4°C. Expect roughly 14.4 wet days totalling 94.7mm. Generally workable, with some weather to plan around.
August in Oslo averages a daily high of 21.6°C with nights around 12.7°C. Expect roughly 13.3 wet days totalling 104.9mm. Generally workable, with some weather to plan around.
September in Oslo averages a daily high of 16.7°C with nights around 9°C. Expect roughly 11.1 wet days totalling 85.4mm. Generally workable, with some weather to plan around.
October in Oslo averages a daily high of 10°C with nights around 4.2°C. Expect roughly 13.2 wet days totalling 97.2mm. Demanding conditions — pack for it and plan indoor options.
November in Oslo averages a daily high of 4.6°C with nights around 0.1°C. Expect roughly 13.7 wet days totalling 76.9mm. A hard month to visit for comfort alone.
December in Oslo averages a daily high of 0.7°C with nights around -3.9°C. Expect roughly 13.2 wet days totalling 53.2mm. 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. Oslo peaks at 74.
Based on 30 years of records, June–September scores highest for comfort in Oslo, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 22.7°C.
August is the wettest, averaging 104.9mm of rain across roughly 13.3 wet days.
January is the coolest month, with average daily highs around 0°C.