| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 6.6° | 1.6° | 66.4mm | 15 | 27 |
| February | 8° | 2° | 58.8mm | 14.1 | 33 |
| March | 11° | 3.2° | 52.4mm | 12.4 | 46 |
| April | 15° | 4.9° | 37.2mm | 11.2 | 62 |
| May | 18.4° | 8.4° | 58mm | 12.5 | 70 |
| June | 21.5° | 11° | 63mm | 10.9 | 78 |
| July | 23.4° | 12.7° | 73.3mm | 12.6 | 75 |
| August | 23.6° | 13° | 79.8mm | 12.4 | 75 |
| September | 20.3° | 10.7° | 67.8mm | 11.7 | 77 |
| October | 15.7° | 8.1° | 67.3mm | 14.2 | 58 |
| November | 10.5° | 4.8° | 77.7mm | 16.4 | 40 |
| December | 7.2° | 2.4° | 78.7mm | 16 | 29 |
January in Sint-Niklaas averages a daily high of 6.6°C with nights around 1.6°C. Expect roughly 15 wet days totalling 66.4mm. A hard month to visit for comfort alone.
February in Sint-Niklaas averages a daily high of 8°C with nights around 2°C. Expect roughly 14.1 wet days totalling 58.8mm. A hard month to visit for comfort alone.
March in Sint-Niklaas averages a daily high of 11°C with nights around 3.2°C. Expect roughly 12.4 wet days totalling 52.4mm. Demanding conditions — pack for it and plan indoor options.
April in Sint-Niklaas averages a daily high of 15°C with nights around 4.9°C. Expect roughly 11.2 wet days totalling 37.2mm. Generally workable, with some weather to plan around.
May in Sint-Niklaas averages a daily high of 18.4°C with nights around 8.4°C. Expect roughly 12.5 wet days totalling 58mm. Generally workable, with some weather to plan around.
June in Sint-Niklaas averages a daily high of 21.5°C with nights around 11°C. Expect roughly 10.9 wet days totalling 63mm. Comfortable conditions for being outdoors all day.
July in Sint-Niklaas averages a daily high of 23.4°C with nights around 12.7°C. Expect roughly 12.6 wet days totalling 73.3mm. Comfortable conditions for being outdoors all day.
August in Sint-Niklaas averages a daily high of 23.6°C with nights around 13°C. Expect roughly 12.4 wet days totalling 79.8mm. Comfortable conditions for being outdoors all day.
September in Sint-Niklaas averages a daily high of 20.3°C with nights around 10.7°C. Expect roughly 11.7 wet days totalling 67.8mm. Comfortable conditions for being outdoors all day.
October in Sint-Niklaas averages a daily high of 15.7°C with nights around 8.1°C. Expect roughly 14.2 wet days totalling 67.3mm. Generally workable, with some weather to plan around.
November in Sint-Niklaas averages a daily high of 10.5°C with nights around 4.8°C. Expect roughly 16.4 wet days totalling 77.7mm. Demanding conditions — pack for it and plan indoor options.
December in Sint-Niklaas averages a daily high of 7.2°C with nights around 2.4°C. Expect roughly 16 wet days totalling 78.7mm. 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. Sint-Niklaas peaks at 78.
Based on 30 years of records, May–September scores highest for comfort in Sint-Niklaas, balancing daytime temperature against rainfall.
August is the warmest, averaging a daily high of 23.6°C.
August is the wettest, averaging 79.8mm of rain across roughly 12.4 wet days.
January is the coolest month, with average daily highs around 6.6°C.