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Boston Weather: 40.0°F | A Few Clouds and Breezy

Weather

Cool With a Few Cumulus Clouds

Angela Zalucha
STAFF METEOROLOGIST

While today will be the warmest we’ve seen all week, the high temperature is still forecast to be several degrees below the normal high of 77 F. High pressure in control will bring us fair weather for the next couple of days. Mornings will start out clear, but as the day progresses the sun will quickly heat the ground, which in turn heats the air near the ground.

This relatively hot air is more buoyant, and so we get rising pockets of hot air. As these air pockets gain altitude, they cool, and eventually water condenses out to form a cloud. Luckily, the high pressure system in the upper atmosphere acts as a lid to limit runaway cloud growth, so the clouds eventually die out. This type of puffy-shaped cloud is referred to as a fair weather cumulus cloud.

Labor Day weekend is shaping up to be cloudy at best. The path of slowly moving Tropical Depression Ernesto is still somewhat uncertain, but it has the potential to dump some rain on us Saturday night and Sunday.

Extended Forecast

Today: Partly sunny. High 70 F (21 C).

Tonight: Clear. Low 57 F (14 C).

Tomorrow: Partly sunny. High 68 F (20 C).

Tomorrow night: Partly cloudy. Low 58 F (14 C).

Saturday: Cloudy with a chance of showers. High 63 F (17 C).

Sunday: Showers. Low 60 F (16 C). High 69 F (21 C).