Cornwall in September is a great opportunity to catch the last of the summer heat but avoid the busyness as you can still enjoy average highs of 17°C and lows of just 13°C. However, chances of rain increase in September so be sure to pack your waterproofs, particularly if you’re planning a Cornwall holiday later in the month.

Cornwall's scenery in September begins to reflect the changing seasons, with hints of autumn colours starting to appear. Overall, September in Cornwall offers a mix of late summer warmth, changing scenery, and diverse wildlife, making it a pleasant time to explore the region's natural beauty and outdoor attractions.