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Cold and dry tonight with a freeze warning for Suffolk County into Tuesday morning

Dress warmly tonight into tomorrow morning and cover or bring in any plants that can get damaged from Tuesday morning's temperatures in the lower to middle 30s.

Matt Hammer

Apr 20, 2026, 6:35 PM

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ALERTS

A freeze warning is in effect for Suffolk County from midnight to 9 a.m. Tuesday. Protect or bring in any plants that may get damaged, as temperatures willl be in the upper 20s to lower 30s. Temperatures will begin warming up into the 40s by mid-morning Tuesday.

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COLD AND DRY OVERNIGHT

Have a winter coat this evening and it will also be a good idea to have a winter hat and gloves into early Tuesday morning, too. The freeze warning for Suffolk County is strictly related to more widespread temperatures at or a little below freezing and how that can damage any outdoor plants. It will feel quite cold anywhere you are on Long Island, though. At least it is dry and mostly clear overnight despite the cold winter feel following some scattered wet weather that we had on Monday morning and afternoon.

RECORD COLD?! The forecast low is 31 degrees for Islip and that is only one degree above the record low, which is 30 degrees at Islip MacArthur Airport set back in 1965! The normal average low temperature for tomorrow morning's date is 43 degrees.

You should budget a few extra minutes to warm up the car in the morning in Nassau and Suffolk Counties, though, with areas of frost around.

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STAYING CHILLY TUESDAY

Keep a coat with you all day. Afternoon highs on Tuesday will only be in the upper 40s to lower 50s. That is well below the normal average high temperature for this time of the year, which is 61 degrees. It will be a nice-looking day at least with a mostly sunny sky through early evening.

NEXT RAIN CHANCE

More clouds arrive Tuesday evening with spotty light rain showers moving in after 9 p.m. We do need rain here on Long Island, and while this scattered rain Tuesday night into Wednesday morning will not be enough to fix the dry conditions, you will want a rain jacket or umbrella during this time. Scattered showers will end Wednesday morning with breaks of sun into Wednesday afternoon.

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WARMING BACK UP MIDWEEK

It becomes more seasonable with highs returning to the upper 50s across much of Long Island. Thursday and Friday will be our warmest and nicest days this week with highs in the upper 50s to middle 60s. It does cool down a bit into the weekend with scattered showers possible both Saturday and Sunday. Overnight low temperatures will be mostly in the 40s after tonight over the next 10 days, which will hopefully bring an end to any isolated frost or freeze conditions for the season going forward.

EXTENDED FORECAST

TONIGHT: FREEZE WARNING (Suffolk County) -- Mostly clear and cold with lows in the upper 20s to lower 30s. Lows in Nassau County will mostly be a couple of degrees above freezing, but it will be cold with frost all across Long Island into Tuesday morning. Dress warmly!

TUESDAY: A cold start with morning temperatures feeling like the upper 20s to low 30s before 8 a.m. After 8 a.m., temperatures will begin to rise into the 40s. Mostly sunny to partly cloudy with afternoon highs close to 50 degrees. A few scattered rain showers will start moving through after 9 p.m. Overnight lows near 39 degrees.

WEDNESDAY: MORE SEASONABLE -- Scattered rain showers in the morning. Then, breaks of afternoon sun. Highs around 57 degrees. Lows near 44 degrees.

THURSDAY: A BIT WARMER -- Sun and clouds. Highs around 64 degrees. Lows near 45 degrees.

FRIDAY: Mostly sunny. Highs around 62 degrees. Lows near 44 degrees.

SATURDAY: Mostly cloudy with a few spotty rain showers. Highs around 56 degrees. Lows near 43 degrees.

SUNDAY: Mostly cloudy with scattered rain showers likely. Not a complete washout. Highs around 56 degrees. Lows near 44 degrees.

MONDAY: Sun and clouds. Highs around 57 degrees. Lows near 46 degrees.

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