October in Leiden averages a daily high of 15.4°C with nights around 8.1°C. Expect roughly 15.6 wet days totalling 87.7mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Leiden is May–September.
Based on ROTTERDAM, NL (22.2km), 1995–2024. 30 years of October data.