Forecast discussion: The weekend started off on a gray note, as cloudy skies, an occasional shower, and some light rain passed through eastern Massachusetts on Saturday. Unfortunately, the rest of the holiday weekend does not look much better.
Right now, a low pressure system over western Vermont has a frontal boundary passing through it. The boundary has remained over Northern New England for the day, and will remain in place on Sunday. This front may help bring some showers and possible thunderstorms over Boston through the day. The activity will be off and on throughout the day, so there is no real timetable on when you should start your cookout or barbecue.
As we move into Sunday night, a cold front now in the middle of the country will slowly move into the Ohio River Valley. This front will help trigger more showers and thunderstorms for Monday, starting in the late morning. This will be the best day to see some rainfall. There may be isolated areas receiving heavy rain, which could create some minor street flooding. Showers and periods of rain will continue into Tuesday, as the cold front passes through the region. We will see clearing skies once the front moves out to sea early Wednesday morning.
We will have mostly sunny skies on Wednesday, thanks to a strong high pressure system to our southwest. However, we will see limited sunshine on Thursday, as a weak cold front passes through Southern New England from Canada. This front will also bring some cooler air, as a new high pressure system takes over for Friday. Temperatures will feel rather like fall, as daytime highs only reach the lower 70’s. Overnight lows Thursday and Friday night will be in the middle 50’s.
As we head into the following weekend, a cold front from Canada will be working its way into Northern New England on Saturday. We will see increasing clouds throughout the mid and late afternoon, with some possible showers arriving around midnight.
72 hour forecast:
Tonight: Patchy fog developing after midnight. Scattered showers and isolated thunderstorms possible with a low of 70.
Sunday: Overcast with scattered showers and an isolated thunderstorm. We will see a high of 80 with south-southwest winds of 9-12 mph.
Fenway Park Forecast (1:35 p.m. vs. Chicago White Sox): Overcast, isolated showers and thunderstorms, 77.
Sunday night: Isolated to scattered showers with a thunderstorm possible and a low of 70. Patchy fog will develop around midnight. Winds will come from the south-southwest at 8-11 mph.
Labor Day: Overcast with scattered showers and isolated thunderstorms through the day, starting in the late morning. We will see a high of 80.
Monday night: Scattered showers, periods of rain, and thunderstorms with patchy fog and a low of 68.
Tuesday: Showers with isolated pockets of rain through the day, ending in the late evening. We will see a high of 81.
Tuesday night: Showers ending around 1 a.m. with clearing skies and a low of 62.
Wednesday: Mostly sunny. Highs 77-80, lows 60-63.
Thursday: Partly sunny with an isolated shower possible by the evening commute. Highs 74-77, lows 53-56.
Friday: Mostly sunny. Highs 70-73, lows 54-57.
Saturday: A sunny morning, with increasing clouds starting mid-afternoon. Highs 74-77, lows 57-60.