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STORM WATCH: Heavy rain, dangerous travel this evening on Long Island

Periods of moderate to torrential rain along with a thunderstorm risk will impact Nassau and Suffolk Counties this evening with slow travel and scattered flooding expected.

Matt Hammer

Aug 20, 2026, 3:20 PM

Updated

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Long Island weather alerts

STORM WATCH: HEAVY RAIN, FLOODING INTO EARLY FRIDAY

After a nice start to the day, the weather will be rough through this evening. Scattered areas of rain showers are leading to heavy, torrential downpours and a chance of thunderstorms through the first half of tonight. Travel is dangerous at times due to low visibility from downpours and areas of flooding. Always turn around if you notice an area covered by water since it is difficult to tell how deep it is, especially after dark.

The worst rain will begin to wind down after 8 p.m. from west to east. That said, scattered rain and a few downpours will remain possible overnight and into early Friday morning, mainly across eastern Suffolk County.

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STORM WATCH FUTURE RADAR

Here is a look at the latest future radar for Long Island showing the timing of the moderate-to-heavy rain impacting Long Island into early tomorrow.

BOAT AND BEACH

Boating and heading to the beach will be dangerous this evening with heavy rain and a few thunderstorms around. Please avoid these activities tonight. Anyone heading to the beach anytime should check the latest rip current statements before getting in the water. Check out more of the local beach weather forecast and tides here.

Long Island Rip Currents
Long Island Tides

Babylon, NY [8515421]

Long Island tide predictions for today and tomorrow

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Tide & Water Summary

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Today’s Tides

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Tomorrow’s Tides

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Tide predictions and recent observations are provided by NOAA CO-OPS. Tide heights are in feet above mean lower low water (MLLW). Many subordinate stations provide tide predictions but do not report live water level, temperature or pressure observations.

EXTENDED FORECAST

TONIGHT: STORM WATCH -- Flooding possible from periods of torrential rain. The worst rain will begin to taper off after 8 p.m. from west to east, but scattered downpours will linger over especially eastern Suffolk County overnight and into early Friday. Please use caution when traveling. Lows near the mid-60s.

FRIDAY: Partly sunny to mostly cloudy with a chance for a few spotty showers. Highs around 78. Lows near 67.

SATURDAY: Mostly cloudy with periods of rain likely, tapering off into the evening and night. Highs around 77. Lows near 68.

SUNDAY: Clouds with a few breaks of sun. Scattered showers and a thunderstorm possible. The timing of any weekend wet weather will become clearer over the next couple of days. Highs around 81. Lows near 66.

MONDAY: Mostly sunny. Highs around 81 degrees. Lows near 63 degrees.

TUESDAY: Mostly sunny. Highs around 80 degrees. Lows near 64 degrees.

WEDNESDAY: Mainly sunny. Highs around 81 degrees. Lows near 65 degrees.

THURSDAY: Partly sunny. Highs around 80 degrees. Lows near 69 degrees.

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