Somerset snow: Warning for county of further snowfall
Higher areas of Somerset could see more than 20cm (7in) of snowfall overnight, the Met Office has said.
A number of problems on the county's roads have been reported as snow leads to hazardous driving conditions.
An amber weather warning has been issued meaning disruption to the roads and public transport is expected.
BBC weather presenter Ian Fergusson said the Quantocks and surrounding areas were likely to see the most snow and 20cm "can't be ruled out".
Snow is causing difficult driving conditions on A roads around the county, including areas such as Yeovil, Shepton Mallet, Bath, and Stratton-on-the-Fosse.
Hazardous conditions have also been reported on the M5 between Wellington and Tiverton with a lane blocked by snow and reduced visibility.
Avon and Somerset Police also reported there had been collisions on the A4 Bath Road in Saltford and on the A38 Knotcroft Lane in Thurloxton.
A Somerset highways statement said rain in the area ahead of snow made gritting roads problematic.
"It is not worth pre-salting at the moment as the current rain will wash it off the highway, as the rain turns to snow we will treat and monitor those areas affected," the statement said.
"It is expected to have stopped snowing by the morning so disruption to traffic on the treated network should be low."
More than 200 schools were forced to close during the last heavy snowfall in the county on Friday.