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Boston Weather: 44.0°F | Mostly Cloudy

Weather: Summer Days Drifting Away

By Greg Lawson

Our weather over the next several days will be typical of late New England summers. Currently, our skies are set by a high pressure system off the coast of Maine. That system is slowly moving farther out to sea. The progression of weather can often be thought of as a wave, and like any wave propagating past a stationary point (i.e. Boston), this ridge will soon be replaced by a trough, here an upstream low pressure system and its accompanying cold front. As the high moves out, its clockwise flow will continue to stream moist southerly air to us from the Gulf area. This moisture combined with the unsettled nature of fronts could spell showers or even thunderstorms when the cold front finally passes overhead, probably late Tuesday night/early Wednesday morning. It seems likely we will have some rain in the area, though it should be light and occur while most people are asleep.

Once the front passes and the low pressure system moves out to sea, we will once again be under the influence of a high pressure system, what we might term “the pleasant phase.” Look for clearer skies, cooler temperatures, and lower humidity Wednesday afternoon through the end of the week. The next trough should pass by this weekend. However, we will withhold prediction for that system as there could be significant interaction with newly developed Tropical Storm Florence.

Extended Forecast

Today: Mostly cloudy. Warm and humid air with a light southerly breeze. High of 80°F (27°C).

Tonight: Overcast. Reasonable chance of showers and even a thunderstorm. Low of 67°F (19°C).

Wednesday: Clouds slowly clearing out. Winds shifting to westerly. Pleasant afternoon and evening. High of 75°F (24°C). Low of 54°F (12°C).

Thursday: Wonderful. Partly cloudy. Light winds. High in the low 70s (21-23°C). Low in the mid 50s (12-14°C).