After a rainy and raw few weeks, the summer-like weather of the past few days has been a most welcome diversion. Yesterday was the first day with above-80°F (27°C) weather in Boston since October 9 of last year. While today will again be mild (though not as warm as yesterday), the second half of the week will be nowhere near as pleasant as the past three days.
The largest meteorological system over the North American continent today is the low pressure system currently centered over the Great Plains. This cyclone will move eastward over the next few days, bringing cloudy weather and several chances of rain to the Northeast later in the week. The best chance of rain in Boston will be overnight Wednesday into Thursday morning, although some lingering showers may affect Friday's weather as well.
With the cloudier weather and a shift of wind direction in advance of the approaching low, temperatures will be much cooler in the latter half of the week. While we should enjoy temperatures over 70°F (21°C) today, we won't see temperatures above 60°F (11°C) again until the weekend.
Today: Sunny and mild, but not as warm as yesterday. High 72°F (22°C).
Tonight: Clear and cooler. Low 47°F (8°C).
Tomorrow: Cloudy and cooler. High 56°F (13°C).
Tomorrow night: Rain showers likely. Low 46°F (7°C).
Thursday: Cloudy and continued cool. High 53°F (12°C).
Thursday night: Cloudy. Low 44°F (6°C).
Friday: Continued cloudy, with scattered showers. High 55°F (13°C).