Cool and cloudy today with showers returning late
Long Island gets a cool, mainly dry start to Sunday, but clouds thicken and showers become increasingly likely later today into tonight. Another shot of much colder air arrives early this week.
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What to expect:
Today starts dry, with considerable cloud cover and temperatures only reaching the mid 60s.
A few showers develop this afternoon, with rain becoming more likely toward evening and tonight.
Sunday night will be cloudy and damp with periods of rain, but heavy rain and flooding are not expected.
Monday begins unsettled before improving, followed by a reinforcing cold front.
The coolest air of the season arrives Monday night into Tuesday, with highs struggling to reach 60 in many areas.
Tuesday and Wednesday look crisp, breezy and dry.
Today (Highs: Lower to Mid 60s)
A cool October day with increasing clouds across Long Island. Much of the morning should remain dry, but scattered showers begin developing during the afternoon and become somewhat more numerous toward evening. Winds will be relatively light, making it feel cool but not especially harsh.
Tonight (Lows: Lower to Mid 50s)
Cloudy with periods of showers or light rain as an area of low pressure passes south of Long Island. The greatest chance for rain will be across coastal areas. Rainfall should generally remain light to moderate, and significant flooding is not expected.
Monday (Highs: Mid to Upper 60s)
A few showers may linger early before conditions gradually improve. Some breaks of sunshine are possible during the afternoon. A reinforcing cold front crosses the region later in the day, setting the stage for a significant temperature drop Monday night.
Monday Night (Lows: Lower to Upper 40s)
Mostly clear, breezy and considerably colder. Temperatures fall through the 50s during the evening and eventually into the 40s across much of Long Island. Gusty northwest winds will make it feel even colder.
Tuesday (Highs: Upper 50s to Lower 60s)
Sunny, breezy and quite cool. This looks to be one of the coolest days of the season so far, with temperatures running roughly 10 degrees below normal.
Tuesday Night (Lows: Lower to Upper 40s)
Clear and chilly. Some of the normally colder portions of central and eastern Long Island could fall well into the 40s.
Wednesday (Highs: Around 60 to Lower 60s)
Mostly sunny, dry and crisp with low humidity. Temperatures remain below normal despite plenty of sunshine.
Thursday (Highs: Mid to Upper 60s)
Mostly sunny and dry as temperatures begin to moderate. Winds become lighter with another pleasant fall day expected.
Weather alerts, watches & hazards
Rain Returns — This Afternoon into Tonight
A wave of low pressure traveling along the front south of Long Island will bring another period of unsettled weather. Scattered showers develop this afternoon, with a better chance for periods of rain tonight. The system is expected to remain far enough offshore that a major rain event is not anticipated.
Flooding Threat — Low
Unlike the recent nor'easter, today's system is not expected to produce significant rainfall. Rainfall should generally be light to moderate, so widespread poor-drainage or flash flooding is not expected.
Sharp Temperature Drop — Monday Night into Tuesday
A reinforcing cold front sweeps across Long Island Monday, opening the door for a much colder Canadian air mass. By Tuesday, afternoon temperatures may struggle to get out of the upper 50s and lower 60s, with nighttime temperatures dropping into the 40s. This should be the coolest air mass of the season so far.
Gusty Winds — Monday Night into Tuesday
Northwest winds increase behind Monday's cold front. It will become breezy on land, while conditions may become considerably rougher on the surrounding waters. The NWS indicates Small Craft Advisory conditions are likely on the ocean and may develop on the other coastal waters as well.
Overall Trend
The main story is the transition to a much more fall-like pattern. Today and tonight are cloudy and occasionally wet, Monday is transitional, and Tuesday and Wednesday bring the coolest, driest air of the season so far. Temperatures should gradually begin recovering later in the week.
