when does fog usually form in inlets and bays?

Fog in inlets and bays usually forms in the early morning or evening , when air and water temperatures are changing and moist air cools to its dew point. It’s especially common when warm, humid air moves over colder water, and it can linger longer in calm, low-lying coastal areas.

Why it happens

• Warm, moist air over colder water cools quickly.
• That cooling raises relative humidity until tiny droplets condense into fog.
• Calm winds and clear skies make it more likely to form and last longer.

Practical rule of thumb

• Most likely time: just before sunrise or after sunset.
• Most likely conditions: high humidity, light wind, and colder water than air.

For boating or coastal travel, fog over water can reduce visibility fast, so it’s worth checking conditions before heading out.