The best time to go to Spa is during the summer months, from June to August, for warm weather and outdoor activities, or in late spring (May) and early autumn (September) for a quieter experience with pleasant temperatures.Summer in Spa offers the warmest weather, with average temperatures in the low 20s Celsius, making it ideal for exploring the natural beauty of the Ardennes, such as hiking or cycling. The longer daylight hours also mean more time to enjoy the town's parklands and outdoor terraces. This period is particularly suitable for families as it coincides with school holidays, and there are often more organised outdoor events.For couples seeking a more relaxed visit, late spring and early autumn provide comfortable temperatures, typically in the mid-to-high teens, and fewer crowds. The natural surroundings are beautiful during these seasons, with spring blossoms or autumn colours adding to the scenery. You'll find it easier to book treatments at the thermal baths and enjoy the town's restaurants without the peak season bustle.