Winters in Tournai are generally cool, with temperatures rarely rising above 13°C or dropping below -10°C. Spring arrives slowly, with temperatures gradually warming up over the months of March and April. Summer is mild, with highs often reaching the mid-20s, but also experiencing some cooler days around 11°C. Autumn brings a return to more moderate temperatures, similar to those found in winter, with highs ranging from 5°C to 21°C. The coldest and warmest months are typically December and July/August respectively.