The RNLI Padstow all-weather and Rock D class inshore lifeboats were used to rescue four adults and three children on Butter Hole beach in Padstow.
A cliff walker spotted the words "send for help" written in the sand.
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The evening will stay cloudy with drizzle and fog in hilly areas.
There will be early evening sunshine with a few patches of rain later on.
The Avon fire service has moved its headquarters from Bristol to share Avon and Somerset Police's Portishead base.