October in Lahti averages a daily high of 8°C with nights around 2.6°C. Expect roughly 15.8 wet days totalling 64.6mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Lahti is June–August.
Based on HEINOLA ASEMANTAUS, FI (32km), 1995–2024. 30 years of October data.