If you’ve ever stood on the edge of Hempstead Harbor in the middle of October, you know exactly why people obsess over the weather Roslyn New York offers. It’s that crisp, salty air hitting your face while the leaves on the hills turn a shade of orange that looks almost fake. But if you’re here in late January? Yeah, that’s a different story. You’re likely dodging slush puddles and wondering if the wind coming off the Long Island Sound is ever going to stop.
Long Island weather is famously fickle. Roslyn sits in a sweet spot, though. Because it’s nestled into the hills of the North Shore, it feels a bit more protected than the flat, wind-swept South Shore, but it still gets the full force of the Atlantic’s mood swings.
What’s Happening Right Now?
As of today, January 13, 2026, we’re seeing a classic mid-winter mix. The high is hovering around 44°F, which honestly isn't too bad for January. We’ve got some sunshine to start the day, but don't get too comfortable. Clouds are moving in this afternoon. By tonight, it’s going to be overcast with a low of about 40°F.
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The rest of the week looks a bit messy.
Wednesday is bringing showers with a high of 47°F.
Then Thursday gets interesting.
We’re looking at a "frozen mix"—that lovely combination of rain and snow that makes the Long Island Expressway a nightmare. The temperature is expected to plummet to 19°F Thursday night. If you’re planning to be out, dress like you’re going to the Arctic.
The Four Seasons (and the Secret Fifth One)
Most people think of the standard four seasons, but in Roslyn, there’s a secret one: "The Damp." It happens in late March. It’s not quite winter, not quite spring, and everything is just... soggy.
Summer (June to August)
July is the heavy hitter here. Average highs sit around 82°F, but the humidity is the real kicker. It’s that "thick" air where you feel like you’re wearing the weather. You’ll see everyone flocking to the Bryant Library just for the AC or grabbing ices in the village.
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Fall (September to November)
This is the gold standard. September in Roslyn is arguably the best weather in the entire state of New York. Highs are around 76°F, the humidity drops off a cliff, and the sky is a ridiculous shade of blue. It’s perfect for walking through the Roslyn Village Historic District without breaking a sweat.
Winter (December to February)
It’s cold. There’s no sugarcoating it. January is the coldest month, with average lows of 27°F. We don’t get as much snow as upstate, but when a Nor'easter hits, Roslyn’s hills become a beautiful, icy trap. The wind chill off the water can make 30°F feel like 10°F real fast.
Spring (March to May)
Spring is a slow burn. April is often rainy (about 8-10 days of it), but by May, the dogwoods and azaleas are exploding. Temperatures jump to a comfortable 68°F.
The North Shore Microclimate
Ever notice how it can be pouring in Garden City but perfectly dry in Roslyn? That’s the "hill effect." Roslyn is part of the Harbor Hill Moraine—basically a giant pile of rocks and dirt left behind by a glacier.
This elevation change does weird things to the local air.
It can trap fog in the valley near the clock tower while the heights are clear.
It also means Roslyn often stays a couple of degrees cooler than the concrete jungle of NYC, which is only about 20 miles away.
Real Talk on Hurricanes and Nor'easters
We can't talk about weather Roslyn New York without mentioning the big stuff. Because Roslyn is at the head of a harbor, storm surge is a real concern. History shows us that. Back in 1972, Hurricane Agnes dumped record rain. More recently, Superstorm Sandy reminded everyone that the "Gold Coast" isn't immune to the ocean.
If you see a "Winter Weather Advisory" or a "Coastal Flood Warning" on the news, take it seriously. The roads around the pond can flood surprisingly fast when a high tide meets a heavy rainstorm.
Survival Tips for Roslyn Locals
- The Layer Rule: Never leave the house in October without a light jacket, even if it’s 70°F at noon. By 5:00 PM, that sea breeze will turn your bones to ice.
- Waterproof Boots: Between the winter slush and the spring mud, a good pair of Bean Boots or Wellies is basically the unofficial uniform of Roslyn.
- Wind Awareness: If you’re dining outdoors near the water, check the wind speed. Anything over 15 mph and your napkins are going to end up in the harbor.
Planning Your Visit
If you’re coming from out of town, aim for the "sweet spots."
Late May is incredible for the greenery.
Early October is unbeatable for the foliage.
Avoid March unless you really like grey skies and wind.
Keep an eye on the National Weather Service (Upton station) for the most accurate local data. They’re the ones who really understand the Long Island atmospheric quirks. Weather apps are okay, but they often miss the specific coastal cooling that happens right here in the 11576.
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Check your sump pump before the March rains hit. If you’re commuting, give yourself an extra 20 minutes on the LIRR when the "frozen mix" is in the forecast. Stay dry, stay warm, and enjoy the view of the harbor—it’s worth the humidity.