| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 3.4° | -5.4° | 118mm | 13.5 | 9 |
| February | 4.8° | -4.9° | 101.8mm | 11.1 | 19 |
| March | 8.7° | -1.4° | 130.2mm | 11.7 | 35 |
| April | 14.7° | 3.6° | 117.8mm | 12.2 | 59 |
| May | 20.3° | 8.9° | 102mm | 13.2 | 74 |
| June | 25.1° | 14.1° | 105.3mm | 11.8 | 76 |
| July | 28.5° | 17.7° | 103.7mm | 10.7 | 73 |
| August | 27.6° | 16.9° | 93mm | 9.4 | 79 |
| September | 23.4° | 13.1° | 99.8mm | 9.6 | 81 |
| October | 17.4° | 7.1° | 139.4mm | 11.4 | 69 |
| November | 11.4° | 1.9° | 105.6mm | 10.6 | 51 |
| December | 6.2° | -2.4° | 127.5mm | 12.7 | 24 |
January in Weymouth averages a daily high of 3.4°C with nights around -5.4°C. Expect roughly 13.5 wet days totalling 118mm. A hard month to visit for comfort alone.
February in Weymouth averages a daily high of 4.8°C with nights around -4.9°C. Expect roughly 11.1 wet days totalling 101.8mm. A hard month to visit for comfort alone.
March in Weymouth averages a daily high of 8.7°C with nights around -1.4°C. Expect roughly 11.7 wet days totalling 130.2mm. Demanding conditions — pack for it and plan indoor options.
April in Weymouth averages a daily high of 14.7°C with nights around 3.6°C. Expect roughly 12.2 wet days totalling 117.8mm. Generally workable, with some weather to plan around.
May in Weymouth averages a daily high of 20.3°C with nights around 8.9°C. Expect roughly 13.2 wet days totalling 102mm. Generally workable, with some weather to plan around.
June in Weymouth averages a daily high of 25.1°C with nights around 14.1°C. Expect roughly 11.8 wet days totalling 105.3mm. Comfortable conditions for being outdoors all day.
July in Weymouth averages a daily high of 28.5°C with nights around 17.7°C. Expect roughly 10.7 wet days totalling 103.7mm. Generally workable, with some weather to plan around.
August in Weymouth averages a daily high of 27.6°C with nights around 16.9°C. Expect roughly 9.4 wet days totalling 93mm. Comfortable conditions for being outdoors all day.
September in Weymouth averages a daily high of 23.4°C with nights around 13.1°C. Expect roughly 9.6 wet days totalling 99.8mm. Comfortable conditions for being outdoors all day.
October in Weymouth averages a daily high of 17.4°C with nights around 7.1°C. Expect roughly 11.4 wet days totalling 139.4mm. Generally workable, with some weather to plan around.
November in Weymouth averages a daily high of 11.4°C with nights around 1.9°C. Expect roughly 10.6 wet days totalling 105.6mm. Demanding conditions — pack for it and plan indoor options.
December in Weymouth averages a daily high of 6.2°C with nights around -2.4°C. Expect roughly 12.7 wet days totalling 127.5mm. 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. Weymouth peaks at 81.
Based on 30 years of records, May–September scores highest for comfort in Weymouth, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 28.5°C.
October is the wettest, averaging 139.4mm of rain across roughly 11.4 wet days.
January is the coolest month, with average daily highs around 3.4°C.