| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 10.2° | -0.1° | 92.3mm | 10.5 | 44 |
| February | 12.1° | 1° | 79mm | 9.4 | 54 |
| March | 16° | 4.4° | 98.1mm | 11 | 65 |
| April | 21.3° | 9.3° | 89.6mm | 10.2 | 80 |
| May | 25° | 14.2° | 103mm | 11.5 | 77 |
| June | 29° | 18.7° | 123.5mm | 11.2 | 70 |
| July | 30.9° | 21.2° | 151.8mm | 11.8 | 61 |
| August | 30° | 20.7° | 146.3mm | 11 | 66 |
| September | 27.1° | 17.6° | 154.4mm | 9.9 | 80 |
| October | 22° | 11.4° | 101.7mm | 8.1 | 84 |
| November | 16.4° | 5.1° | 92.2mm | 8.6 | 71 |
| December | 12.2° | 1.9° | 96.7mm | 10.1 | 55 |
January in South Suffolk averages a daily high of 10.2°C with nights around -0.1°C. Expect roughly 10.5 wet days totalling 92.3mm. Demanding conditions — pack for it and plan indoor options.
February in South Suffolk averages a daily high of 12.1°C with nights around 1°C. Expect roughly 9.4 wet days totalling 79mm. Demanding conditions — pack for it and plan indoor options.
March in South Suffolk averages a daily high of 16°C with nights around 4.4°C. Expect roughly 11 wet days totalling 98.1mm. Generally workable, with some weather to plan around.
April in South Suffolk averages a daily high of 21.3°C with nights around 9.3°C. Expect roughly 10.2 wet days totalling 89.6mm. Comfortable conditions for being outdoors all day.
May in South Suffolk averages a daily high of 25°C with nights around 14.2°C. Expect roughly 11.5 wet days totalling 103mm. Comfortable conditions for being outdoors all day.
June in South Suffolk averages a daily high of 29°C with nights around 18.7°C. Expect roughly 11.2 wet days totalling 123.5mm. Generally workable, with some weather to plan around.
July in South Suffolk averages a daily high of 30.9°C with nights around 21.2°C. Expect roughly 11.8 wet days totalling 151.8mm. Generally workable, with some weather to plan around.
August in South Suffolk averages a daily high of 30°C with nights around 20.7°C. Expect roughly 11 wet days totalling 146.3mm. Generally workable, with some weather to plan around.
September in South Suffolk averages a daily high of 27.1°C with nights around 17.6°C. Expect roughly 9.9 wet days totalling 154.4mm. Comfortable conditions for being outdoors all day.
October in South Suffolk averages a daily high of 22°C with nights around 11.4°C. Expect roughly 8.1 wet days totalling 101.7mm. Comfortable conditions for being outdoors all day.
November in South Suffolk averages a daily high of 16.4°C with nights around 5.1°C. Expect roughly 8.6 wet days totalling 92.2mm. Generally workable, with some weather to plan around.
December in South Suffolk averages a daily high of 12.2°C with nights around 1.9°C. Expect roughly 10.1 wet days totalling 96.7mm. Generally workable, with some weather to plan around.
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. South Suffolk peaks at 84.
Based on 30 years of records, April–May scores highest for comfort in South Suffolk, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 30.9°C.
September is the wettest, averaging 154.4mm of rain across roughly 9.9 wet days.
January is the coolest month, with average daily highs around 10.2°C.