The worrying data shows there were 510 confirmed cases in the area in the seven days before national lockdown restrictions were introduced – nearly three and a half times the 146 seen on 3 May, the peak day in the spring.
Transmission is highest in the community, meaning people are more likely to catch the virus from the people they live with or their friends, than when they are at work or school.
North Somerset Council’s executive member for health, Cllr Mike Bell, said: “The speed at which our case numbers are increasing is concerning.
“We have shot up from one of the lowest in the south west to rates nearly 50 per cent higher than the regional number and are pretty close to the national figure.
“In July and August, we were regularly seeing one or even no positive tests in a day. We are now seeing nearly 100 on some days, with 99 reported on 2 November.
“The really worrying part is that these are still going up, taking us closer to the higher rates seen by our neighbours, like Bristol and South Gloucestershire.”
Director of Public Health, Matt Lenny, added: “The virus is circulating freely in our community and we need to do what we can to look after ourselves and our loved ones.
"This is not just down to more tests being done now, we are seeing a real and sustained increase in our local case numbers.
“Please observe the current restrictions and stay home as much as you can. Wash your hands regularly, wear a mask if you can, and make space.”
There is a lag in case data, meaning the latest information is for days leading up to England’s lockdown, which shows on 5 November the seven-day rate for North Somerset was 237.2 per 100,000, up from 174.4 on Friday. The comparable South West seven-day rate was 161.9 and the England rate 245.2.
More details on local case data at can be found at www.n-somerset.gov.uk/lomp.
Case data is also available at national, regional, council and neighbourhood level at https://coronavirus.data.gov.uk/cases.