The Met Office have issued a fog warning this morning for Dorset.
The warning is in place until 11am this morning.
Driving conditions will be difficult the forecaster says due to the thick fog, mainly on modest hills and near the south coast.
A spokesperson said: "Very moist air, associated with a frontal system slowly moving northwards, is arriving into south-western parts of the UK.
"As cloud above it thins, and rain eases, this will allow a period of thick low cloud and fog to continue to develop, settle onto hills, and expand northwards with visibilities below 50 m in a few places.
"Fog should gradually lift into low cloud this morning, with visibility slowly improving."
Residents have been warned to expect "difficult, and in places dangerous driving conditions with journeys taking longer than usual.
"There is a chance of delays to flights", they added.
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