During the winter lockdown seven-day rates had previously peaked at 423.6 cases per 100,000 population. Reported cases have leapfrogged this and now stand at 470.1.
This is also well above the national rate of 399.6 and the regional figure of 386.4.
North Somerset Council’s deputy leader and executive member for health, Cllr Mike Bell, said: “The risk of coming into contact with Covid in our community has never been higher.
“Those who’ve been double vaccinated at least two weeks ago will have the best protection against catching the disease or getting seriously ill if they do come into contact the with virus.
“Our vaccination rates locally are excellent, with nearly 70% of people over 16 having had two jabs, but this still leaves thousands of people with less or no protection, having only had one, or none.
“So even though legally you don’t need to follow Covid safety rules anymore, it’s still extremely important you do all you can to avoid catching or spreading the virus.
"This includes the crucial importance of isolating if you have symptoms, test positive, or are told to do so, either by NHS Test and Trace or by the NHS Covid app."
North Somerset's Director of Public Health, Matt Lenny, added: “Vaccinations alone aren’t enough to put an end to Covid, especially when we have rising infection rates.
“Keep washing your hands, wearing face coverings, getting tested, self-isolating if you need to, and staying outside as much as you can.
“The virus spreads fastest in closed settings that have very little ventilation, where it is crowded, and where you have close contact with people you don’t usually mix with.
“With restrictions easing, it’s not always possible to avoid these kinds of situations, but there are things you can do to lower your own risk.
“Stay outside as much as you can - opening doors and windows if you have to be inside to let in fresh air, try to keep your distance from people you don’t normally mix with - wearing a face covering if you can’t, and keep washing your hands.
“And please look after each other. There are still many people who haven’t been able to get both vaccinations and everyone’s experience is different, so we’re each having to assess our own level of risk and what we do and don’t feel comfortable doing.”