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STORM WATCH: Moderate to heavy rain impacts Long Island this evening

Dry start to the day with rain developing after 2pm. Rain heavy at times will cause some flooding.

Rich Hoffman

Aug 20, 2026, 5:27 AM

Updated

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STORM WATCH: Heavy rain threat leads to Flood Watch posted from 2pm today to 2am Friday.

We’ll start the day with sunshine, but keep the umbrella handy because some wet weather is heading our way later today. Clouds will increase this afternoon, with showers developing mainly after 2 p.m. The rain will move into western Nassau County first before spreading east toward Montauk through the late afternoon and evening. Scattered thunderstorms are also possible, especially around the evening rush and near sunset. High temperatures will reach the 80s, with cooler 70s along the shoreline.

A Flood Watch is in effect from 2 p.m. today through 2 a.m. Friday as periods of moderate to heavy rain could lead to localized street and poor-drainage flooding. Rainfall totals of 1 to 2 inches are possible, with locally higher amounts where heavier showers or thunderstorms develop. If you’re traveling later today or this evening, be prepared for areas of heavy rain, reduced visibility and water-covered roads.

Tonight will remain unsettled with showers, periods of rain and a few scattered thunderstorms. Some pockets of moderate to heavy rain are possible, so localized street flooding will remain a concern through the overnight hours. Conditions will gradually become less active toward Friday morning, but plenty of clouds will stick around. Overnight lows will fall into the 60s. Friday stays mostly cloudy and cooler with a couple of spotty showers and highs only in the upper 70s. More showers are possible Friday night, with lows in the 60s.

Unfortunately, the unsettled pattern hangs around for the weekend. Saturday will feature mostly cloudy skies and scattered showers, with cooler highs in the mid- to upper 70s. Additional showers are possible Saturday night. We may catch a few breaks in the clouds Sunday morning, but showers will remain possible through the day. Temperatures will be a little warmer Sunday, reaching the upper 70s to lower 80s.

FUTURECAST

Here is a look at the latest future radar for Long Island showing the timing of the rain that arrives on Thursday.

BOAT AND BEACH

Anyone heading to the beach 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 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.

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