The best time to go to Oeiras is during the shoulder seasons of spring (April to May) and early autumn (September to October), when the weather is pleasant and the crowds are smaller.During these months, you'll experience comfortable temperatures, typically ranging from the mid-60s to low 70s Fahrenheit (18-23°C), which is ideal for exploring the town and enjoying the coastal areas without the intense heat of summer. The spring brings blooming flowers, making walks along the waterfront particularly scenic, while early autumn offers warm ocean temperatures for swimming. This period also generally sees fewer tourists compared to the peak summer months, allowing for a more relaxed experience at attractions and restaurants.For travelers who enjoy beach activities and warmer weather, the summer months of June, July, and August are also an excellent choice, though they are the busiest. Temperatures often reach into the high 70s and 80s Fahrenheit (25-30°C), great for spending time on the beaches like Praia de Santo Amaro de Oeiras. While it's a more crowded time, the summer buzz brings additional outdoor events and activities.