| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | -1.5° | -8.7° | 72.1mm | 17.5 | 0 |
| February | -0.6° | -9.1° | 64.9mm | 13.7 | 3 |
| March | 5.2° | -4.2° | 65.8mm | 13 | 17 |
| April | 12.5° | 1.6° | 80mm | 11.9 | 52 |
| May | 19.6° | 7.9° | 85.2mm | 11.8 | 75 |
| June | 24.6° | 13.2° | 85.6mm | 10.6 | 79 |
| July | 26.9° | 15.5° | 80.7mm | 10.7 | 79 |
| August | 25.8° | 14.7° | 78.8mm | 9.6 | 81 |
| September | 22.4° | 11.2° | 77.2mm | 9.5 | 81 |
| October | 15° | 5.3° | 81.9mm | 13.8 | 56 |
| November | 7.9° | -0.2° | 74.2mm | 12.4 | 33 |
| December | 1.7° | -4.6° | 81.4mm | 16.3 | 5 |
January in London averages a daily high of -1.5°C with nights around -8.7°C. Expect roughly 17.5 wet days totalling 72.1mm. A hard month to visit for comfort alone.
February in London averages a daily high of -0.6°C with nights around -9.1°C. Expect roughly 13.7 wet days totalling 64.9mm. A hard month to visit for comfort alone.
March in London averages a daily high of 5.2°C with nights around -4.2°C. Expect roughly 13 wet days totalling 65.8mm. A hard month to visit for comfort alone.
April in London averages a daily high of 12.5°C with nights around 1.6°C. Expect roughly 11.9 wet days totalling 80mm. Demanding conditions — pack for it and plan indoor options.
May in London averages a daily high of 19.6°C with nights around 7.9°C. Expect roughly 11.8 wet days totalling 85.2mm. Comfortable conditions for being outdoors all day.
June in London averages a daily high of 24.6°C with nights around 13.2°C. Expect roughly 10.6 wet days totalling 85.6mm. Comfortable conditions for being outdoors all day.
July in London averages a daily high of 26.9°C with nights around 15.5°C. Expect roughly 10.7 wet days totalling 80.7mm. Comfortable conditions for being outdoors all day.
August in London averages a daily high of 25.8°C with nights around 14.7°C. Expect roughly 9.6 wet days totalling 78.8mm. Comfortable conditions for being outdoors all day.
September in London averages a daily high of 22.4°C with nights around 11.2°C. Expect roughly 9.5 wet days totalling 77.2mm. Comfortable conditions for being outdoors all day.
October in London averages a daily high of 15°C with nights around 5.3°C. Expect roughly 13.8 wet days totalling 81.9mm. Generally workable, with some weather to plan around.
November in London averages a daily high of 7.9°C with nights around -0.2°C. Expect roughly 12.4 wet days totalling 74.2mm. A hard month to visit for comfort alone.
December in London averages a daily high of 1.7°C with nights around -4.6°C. Expect roughly 16.3 wet days totalling 81.4mm. 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. London peaks at 81.
Based on 30 years of records, May–September scores highest for comfort in London, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 26.9°C.
June is the wettest, averaging 85.6mm of rain across roughly 10.6 wet days.
January is the coolest month, with average daily highs around -1.5°C.