| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 9.2° | 3.8° | 91.6mm | 16 | 35 |
| February | 9.4° | 4.1° | 73.4mm | 13.6 | 39 |
| March | 10.8° | 4.9° | 59.7mm | 13.2 | 44 |
| April | 13° | 6.4° | 49.7mm | 10.7 | 56 |
| May | 16° | 9.2° | 47.4mm | 10.5 | 66 |
| June | 18.7° | 11.9° | 46.1mm | 9 | 78 |
| July | 20.7° | 13.8° | 52.1mm | 9.9 | 80 |
| August | 20.8° | 14° | 55.5mm | 11 | 78 |
| September | 18.9° | 12.3° | 66.1mm | 10.5 | 75 |
| October | 15.9° | 10.2° | 102.2mm | 15.4 | 57 |
| November | 12.4° | 6.7° | 109.9mm | 16.2 | 46 |
| December | 10° | 4.6° | 102.3mm | 16.4 | 38 |
January in Weymouth averages a daily high of 9.2°C with nights around 3.8°C. Expect roughly 16 wet days totalling 91.6mm. Demanding conditions — pack for it and plan indoor options.
February in Weymouth averages a daily high of 9.4°C with nights around 4.1°C. Expect roughly 13.6 wet days totalling 73.4mm. Demanding conditions — pack for it and plan indoor options.
March in Weymouth averages a daily high of 10.8°C with nights around 4.9°C. Expect roughly 13.2 wet days totalling 59.7mm. Demanding conditions — pack for it and plan indoor options.
April in Weymouth averages a daily high of 13°C with nights around 6.4°C. Expect roughly 10.7 wet days totalling 49.7mm. Generally workable, with some weather to plan around.
May in Weymouth averages a daily high of 16°C with nights around 9.2°C. Expect roughly 10.5 wet days totalling 47.4mm. Generally workable, with some weather to plan around.
June in Weymouth averages a daily high of 18.7°C with nights around 11.9°C. Expect roughly 9 wet days totalling 46.1mm. Comfortable conditions for being outdoors all day.
July in Weymouth averages a daily high of 20.7°C with nights around 13.8°C. Expect roughly 9.9 wet days totalling 52.1mm. Comfortable conditions for being outdoors all day.
August in Weymouth averages a daily high of 20.8°C with nights around 14°C. Expect roughly 11 wet days totalling 55.5mm. Comfortable conditions for being outdoors all day.
September in Weymouth averages a daily high of 18.9°C with nights around 12.3°C. Expect roughly 10.5 wet days totalling 66.1mm. Comfortable conditions for being outdoors all day.
October in Weymouth averages a daily high of 15.9°C with nights around 10.2°C. Expect roughly 15.4 wet days totalling 102.2mm. Generally workable, with some weather to plan around.
November in Weymouth averages a daily high of 12.4°C with nights around 6.7°C. Expect roughly 16.2 wet days totalling 109.9mm. Demanding conditions — pack for it and plan indoor options.
December in Weymouth averages a daily high of 10°C with nights around 4.6°C. Expect roughly 16.4 wet days totalling 102.3mm. Demanding conditions — pack for it and plan indoor options.
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 80.
Based on 30 years of records, June–September scores highest for comfort in Weymouth, balancing daytime temperature against rainfall.
August is the warmest, averaging a daily high of 20.8°C.
November is the wettest, averaging 109.9mm of rain across roughly 16.2 wet days.
January is the coolest month, with average daily highs around 9.2°C.