Balmy To Below-Average Temperatures: Long Island Work Week

LONG ISLAND, NY — As the region dries out, temperatures will drop briefly — but balmy weather returns by week's end.

"Cooler air will overspread the eastern U.S. Tuesday and Wednesday as the jet stream dips south and establishes a northwest flow," Jason Craig from JC Weather NYC and Long Island said on Facebook.

In fact, conditions during the first half of the week will swing near to slightly below the historical average in the Northeast, said Alex Sosnowski, AccuWeather senior meteorologist.

However, by Friday, temperatures start rising again into the 50s in Nassau and Suffolk counties.

Here's the 5-day forecast based on southwest Suffolk:

• Monday - Mostly sunny. Highs in the lower 50s. West winds 10 to 15 mph with gusts up to 25 mph.
• Tonight - Mostly cloudy in the evening, then clearing. Lows in the mid 30s. Northwest winds 10 to 15 mph.
• Tuesday - Sunny in the morning, then becoming mostly cloudy. Highs in the mid 40s. Northwest winds 10 to 15 mph.
• Tuesday Night - Mostly cloudy. Lows in the lower 30s. North winds 5 to 10 mph.
• Wednesday - Partly sunny. Highs in the lower 40s. North winds 10 to 15 mph.
• Wednesday Night - Partly cloudy. Lows in the mid 20s.
• Thursday - Mostly sunny. Highs in the lower 40s.
• Thursday Night - Partly cloudy. Lows in the lower 30s.
• Friday - Mostly sunny. Highs around 50.
• Friday Night - Mostly cloudy in the evening, then becoming partly cloudy. Lows around 40.