1. The September Sunshine

When you ask most people the best month to visit Cornwall, they’ll say August, or July at a push. While September may be known for being a few degrees cooler as it’s the first month of the autumn season, Cornwall has been blessed with some glorious weather during this off-peak month.

In September, Newquay enjoys mild and often pleasant conditions. Daytime highs typically reach around 19 °C, while nights dip to about 13 °C. Visitors can expect roughly 12 to 13 hours of daylight each day, giving plenty of time to enjoy the coast and countryside. The sea is still relatively warm after basking in the summer sun, with average water temperatures of about 16 °C—refreshing but inviting, especially with a wetsuit. These conditions make September an excellent time for both beach trips and watersports, with enough daylight and warmth to enjoy Cornwall at a gentler pace than the peak summer months.

2. Less is More

In general, fewer people visit Cornwall in September than July or August, which makes everything that little more enjoyable. You can book a table at that restaurant you’ve always wanted to try, not get stuck in traffic on the A30, and even get a great spot on the beach if the weather’s playing ball.

Of course, there’s still plenty going on so you’ll still need to be prepared for your September holiday. You’re also more likely to get a booking at that restaurant you had your eye on.

3. Vitamin Sea…

Some say September is the best time to take on the Cornish sea, as it’s been basking in the summer sunshine for three months. This makes it ideal for taking a dip; whether it be swimming, surfing or diving, the sea is much more inviting.

Based on average water temperature observations over the past ten years, it’s reported that the beaches in and surrounding Bude had the hottest September sea temperatures in Cornwall reaching up to 18°C.

Why not follow a dip with a rejuvenating sauna, here’s our favourite toasty spots (some are just steps from the sand, too).

4. Perfect for your pooches

Cornwall has a wonderful selection of dog-friendly beaches. During the summer months many beaches in Cornwall have restrictions, come 1st September, many of the seasonal bans are lifted and dogs are free to use the beaches all day long.

Some of our favourite beaches lifting their bans include Kynance Cove,  Porthcurno, Porthgwidden and Praa Sands. Some restrictions last until the end of the month, so do check the list here before you travel.

5.  Fun fest(ivals)…

Cornwall doesn’t go to sleep once the peak summer season is over. During September there are plenty of fun festivals to embrace.

As the summer season draws to a close, St Ives September Festival (12–26 September 2026) keeps the flame burning with a two-week celebration of music and the arts. An area known for its creativity, St Ives September Festival is one of the leading cultural festivals in the UK, covering music, art and poetry events, exhibitions, galleries, guided walks and open artist studios.

Cider lovers rejoice… the first annual Little Orchard Cider and Music Festival is back for its twelth celebration at  Healeys Cornish Cyder Farm near Truro, on Friday 11th through to Sunday 13th September. For more sweet music, Kernowfornia Festival (26–28 September) is held at Looe Beach, the festival features both internationally renowned acts and local musicians, across two stages right on the beach.

If food is the way to your heart… Truro Food Festival  takes place between 23–27 September. It’s a celebration of Cornish food and drink, featuring local chefs and stalls in the heart of Cornwall’s only city.