The Met Office have issued a weather warning for fog, urging people to take care.
The forecaster issued the yellow warning in the early hours of the morning.
It covers the areas of Bournemouth, Christchurch and Poole, as well as the Dorset Council area.
A spokesperson said: "Not everywhere will experience fog, but where fog patches do develop, they are likely to become dense in some places with visibility less than 100 metres, and perhaps less than 50 metres in a few spots.
"The fog will slowly thin towards late morning but may persist into the afternoon in some areas."
People have been warned to expect slower journey times with delays to bus and train services possible.
There is a chance of delays or cancellations to flights.
Another fog warning was issued on Tuesday this week.
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