Living in Mamaroneck is a bit of a weather tightrope walk. You’ve got the Sheldrake and Mamaroneck Rivers on one side and the Long Island Sound on the other. It’s beautiful, honestly, until the sky turns that specific shade of "uh-oh" gray.
Right now, if you step outside, it's a crisp 30°F. It feels like 27°F because of a 4 mph wind coming out of the west. The humidity is sitting heavy at 89%, and it's mostly cloudy. Basically, it’s a standard January night in Westchester, but there's more coming.
Weather Forecast Mamaroneck NY: The Reality of Coastal Living
People often check the generic "New York" forecast and think they’re set. That is a massive mistake. Mamaroneck’s geography means we get micro-climates that the City misses entirely. For Saturday, January 17, 2026, we’ve been dealing with a mix of rain and snow. The high hit 37°F, but tonight it's dropping to 30°F.
The snow chance for tonight is low—only about 9%—but don't get too comfortable.
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The Week Ahead: Snow and Shivers
If you’ve lived here long enough, you know that the Long Island Sound acts like a giant temperature regulator. It can turn a blizzard into a slush-fest or a light flurry into a localized nightmare.
- Sunday, January 18: We’re looking at snow showers during the day and light snow at night. The high will be 35°F, dropping to 25°F. There’s a 40% chance of precipitation, so keep the shovel handy.
- Monday, January 19: Things clear up slightly. It’ll be partly sunny with a high of 31°F. It’s going to get cold, though, with a low of 20°F.
- Tuesday, January 20: This is the day you’ll want the heavy parka. It’ll be sunny but frigid, with a high of only 24°F and a bone-chilling low of 16°F.
Why the "Sound Effect" Matters
Most people don't realize how much the Sound dictates the weather forecast Mamaroneck NY residents actually experience. In the winter, the relatively warmer water (compared to the frozen ground) can sometimes weaken snow systems, but it also creates that damp, "gets-into-your-bones" cold that 20 degrees in Mamaroneck feels way worse than 20 degrees in, say, Syracuse.
Coastal Flooding: The Elephant in the Room
We have to talk about the water. Mamaroneck is notoriously "flood-prone." It's not just a rumor; it’s a geographical reality. With sea levels rising, the Village has become hyper-vigilant.
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Current data suggests a significant risk of flooding events over the next few decades. Even a moderate rainstorm, when combined with a high tide in the Harbor, can send water creeping into the Flats or backing up the storm drains.
When you see a "Gale Warning" for the Long Island Sound—like the ones that often pop up this time of year with west winds hitting 20 to 30 knots—you need to pay attention. High winds pushing water into the harbor is how we end up with closed roads and wet basements.
Misconceptions About Westchester Winters
"It doesn't snow like it used to."
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I hear that at the coffee shop all the time. While it's true that the average sliding 31-day snowfall is changing, February is actually when Mamaroneck typically sees its peak snow accumulation, often averaging over 7 inches. January is just the warm-up act.
The humidity we’re seeing right now (89%) is also typical. Mamaroneck stays damp. That moisture makes the air feel heavier and the temperatures feel more extreme.
Actionable Steps for Mamaroneck Residents
If you're looking at the weather forecast Mamaroneck NY and trying to plan your life, don't just look at the "High" and "Low."
- Watch the Wind Direction: A north wind (like we expect Sunday at 6 mph) usually brings the drier, colder air. A south wind often brings the moisture that turns our snow into a messy "wintry mix."
- Clear the Drains: Honestly, if you have a storm drain near your house, clear the leaves and debris now. Before the Tuesday freeze hits, you want that water gone so it doesn't turn your street into an ice rink.
- Check the Tides: If the forecast calls for heavy rain, check the high tide schedule for Mamaroneck Harbor. If the rain peaks at high tide, the "Flats" are likely to see some ponding.
- Prepare for the Tuesday Freeze: With a low of 16°F coming Tuesday night, make sure your outdoor hoses are disconnected. That kind of sudden drop is what bursts pipes in older homes.
The weather here is a moving target. Stay vigilant, watch the Sound, and maybe keep an extra bag of salt in the garage. You're going to need it this week.