| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 7.8° | 1.2° | 51.3mm | 14.6 | 31 |
| February | 8.9° | 1.4° | 44.1mm | 12.8 | 38 |
| March | 11.3° | 2.7° | 37mm | 11.2 | 50 |
| April | 14.2° | 3.7° | 34.2mm | 10.2 | 61 |
| May | 17.5° | 6.9° | 47.8mm | 10.2 | 72 |
| June | 20.6° | 9.8° | 51.8mm | 9.7 | 81 |
| July | 23.1° | 11.9° | 44.7mm | 10 | 80 |
| August | 22.9° | 11.8° | 60.7mm | 10.5 | 79 |
| September | 19.9° | 9.7° | 43.3mm | 9.8 | 80 |
| October | 15.5° | 7° | 54.7mm | 12 | 62 |
| November | 11.1° | 3.5° | 60.4mm | 14.2 | 43 |
| December | 7.6° | 1° | 57.4mm | 14 | 31 |
January in Colchester averages a daily high of 7.8°C with nights around 1.2°C. Expect roughly 14.6 wet days totalling 51.3mm. A hard month to visit for comfort alone.
February in Colchester averages a daily high of 8.9°C with nights around 1.4°C. Expect roughly 12.8 wet days totalling 44.1mm. Demanding conditions — pack for it and plan indoor options.
March in Colchester averages a daily high of 11.3°C with nights around 2.7°C. Expect roughly 11.2 wet days totalling 37mm. Demanding conditions — pack for it and plan indoor options.
April in Colchester averages a daily high of 14.2°C with nights around 3.7°C. Expect roughly 10.2 wet days totalling 34.2mm. Generally workable, with some weather to plan around.
May in Colchester averages a daily high of 17.5°C with nights around 6.9°C. Expect roughly 10.2 wet days totalling 47.8mm. Generally workable, with some weather to plan around.
June in Colchester averages a daily high of 20.6°C with nights around 9.8°C. Expect roughly 9.7 wet days totalling 51.8mm. Comfortable conditions for being outdoors all day.
July in Colchester averages a daily high of 23.1°C with nights around 11.9°C. Expect roughly 10 wet days totalling 44.7mm. Comfortable conditions for being outdoors all day.
August in Colchester averages a daily high of 22.9°C with nights around 11.8°C. Expect roughly 10.5 wet days totalling 60.7mm. Comfortable conditions for being outdoors all day.
September in Colchester averages a daily high of 19.9°C with nights around 9.7°C. Expect roughly 9.8 wet days totalling 43.3mm. Comfortable conditions for being outdoors all day.
October in Colchester averages a daily high of 15.5°C with nights around 7°C. Expect roughly 12 wet days totalling 54.7mm. Generally workable, with some weather to plan around.
November in Colchester averages a daily high of 11.1°C with nights around 3.5°C. Expect roughly 14.2 wet days totalling 60.4mm. Demanding conditions — pack for it and plan indoor options.
December in Colchester averages a daily high of 7.6°C with nights around 1°C. Expect roughly 14 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. Colchester peaks at 81.
Based on 30 years of records, June–September scores highest for comfort in Colchester, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 23.1°C.
August is the wettest, averaging 60.7mm of rain across roughly 10.5 wet days.
December is the coolest month, with average daily highs around 7.6°C.