September in San Sebastián de los Reyes averages a daily high of 27.9°C with nights around 13.5°C. Expect roughly 4.4 wet days totalling 32.5mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit San Sebastián de los Reyes is April–May.
Based on MADRID BARAJAS, SP (11.6km), 1995–2024. 30 years of September data.