weather in bar harbour maine in september

Ocean salt from waves and breakers on the rocks makes great particles for water to cling to.įor boaters fog can be a hazard. Into this discussion of temperature we can add the fact that water vapor likes to condense on particles. Some fog is, therefore, possible as the temperature drops in the evening. For example, as I am writing this, the dewpoint in South Portland is 56oF, and the temperature is 59oF.

Fog begins to form when the (air) temperature is within 4oF of the dewpoint. First, what is dewpoint? It is the temperature at which the air can no longer hold the water vapor that is in it, and the water vapor starts to condense or form droplets. So now – here is a good use of the dewpoint number in the daily weather forecast. Therefore in summer, in Maine, it is not hard to have the situation where warm air off the land is cooled as it passes over the water, and the water vapor condenses.

In Portland, Maine the range of temperature for those three months is from 61o F (early July) to 58oF (late September) and in Bar Harbor from 58o F (early July) to 63oF (early August) to 57o (late September). The ocean temperatures vary with season, but for the July-September time frame the ocean temperatures do not vary much. When warm moist air blows from the southwest onto the cooler ocean, the conditions are right for fog.įog is created when warm moist air hits the colder air just above the ocean surface. At the scale of the whole state (as opposed to the scale of the harbor or inlet), the landmass is largely southwest of the water mass. The geography of Maine provides the perfect conditions for fog. In summer, in Maine, warm air off the land is cooled as it passes over the water, and the water vapor condenses. Fog is created when warm moist air hits the colder air just above the ocean surface.

Weather in bar harbour maine in september