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How long does fog last?

I have a big road trip coming up in the Pacific Northwest, and I heard there is a dense fog advisory. I’m concerned about whether I will be able to drive in it. How long does fog last?

avatar
Maxine Boyko · Updated on
Reviewed by Shannon Martin, Licensed Insurance Agent.
A
Pacific Northwest road trip
sounds lovely! Foggy conditions can last for varying amounts of time and can dissipate as quickly as they formed—there’s no set amount of time that fog lasts.
That said, fog typically tends to dissipate with daylight in the mornings. When the air and ground are warmed up by the sun, the air temperature is warmer than the dew point temperature, which clears the fog through evaporation. But of course, there are other factors that could keep the fog hanging around.
Unfortunately, I can’t give you a straight answer on how long fog lasts. As a general rule, however, it is important to drive safely in foggy conditions. Be extra careful on the road or avoid driving altogether in intense fog conditions.
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