Honestly, if you’re planning a move to Westchester or just trying to figure out if your weekend at Manor Park is going to be a washout, looking at the generic "New York" forecast is a mistake. Larchmont is its own beast. It’s got that Long Island Sound influence that can make it feel like a different planet compared to, say, White Plains, which is only a few miles inland.
The weather in Larchmont NY is basically a tug-of-war between the humid Atlantic air and the cold fronts sliding down from Canada. It's beautiful. It's temperamental. And it's often surprising.
The Sound Effect: Why We’re Not Just "NYC North"
You’ve probably noticed that when the local news says it’s 90 degrees in the city, you might be sitting on your porch in Larchmont feeling a cool breeze. That’s the Sound. In the spring, the water is still freezing, so it acts like a giant air conditioner. This is great in June, but in April? It’s kinda brutal. You’ll see people in Manhattan wearing t-shirts while Larchmont residents are still clutching their Patagonia fleeces.
Then there’s the humidity. Because we’re right on the water, the "dew point" is a term you’ll get very familiar with. In July, the air can get so thick you feel like you’re swimming to your car.
Summer Realities and the Heat
Summers here are warm, humid, and wet.
It’s the truth.
July is typically the hottest month, with average highs around 84°F and lows staying near 69°F. But averages are liars. We get those heat waves where the thermometer hits 95°F for three days straight, and the humidity makes it feel like 105°F.
What's interesting is how the rain happens. We don't really do "all-day drizzles" in the summer. Instead, we get these massive, cinematic afternoon thunderstorms. One minute you're at the Larchmont Yacht Club, and the next, the sky turns charcoal grey and drops two inches of rain in an hour. According to data from the NOAA, the chance of a "wet day" actually peaks in late May and slowly tapers off through the summer, but the intensity of the storms usually ramps up in August.
Winter in the 10538: It’s Not Just About Snow
January is the coldest month, no surprise there. The average low is around 26°F, and the high struggles to get past 38°F. But here’s the thing: Larchmont doesn’t always get the same snow as the rest of the county.
Because we are coastal, we often hit that "rain-snow line."
It’s a local tragedy.
You’ll watch the radar, see a massive blizzard coming, and then at the last second, the temp rises two degrees and you get eight hours of freezing slush instead of the picturesque powder they’re getting in Scarsdale.
- Average Cold Season: Early December to mid-March.
- The Big Freezes: We rarely drop below 11°F, but when a Nor’easter rolls in, the wind chill off the water can make it feel sub-zero.
- Cloud Cover: February is actually our cloudiest month. The sky is overcast or mostly cloudy over half the time. It’s the "grey period" everyone complains about at the coffee shop.
Hurricane Season and the Flooding Conversation
We have to talk about the water. If you live south of the Boston Post Road, you know that the weather in Larchmont NY isn't just about what’s falling from the sky—it’s about where it’s going.
Larchmont has a complex history with flooding. Events like the remnants of Hurricane Ida in 2021 or the more recent flash floods in late 2024 and 2025 have shown how vulnerable the local infrastructure is to "cloudbursts." It’s not just the big named hurricanes anymore. We are seeing a trend of intense, short-duration rain events that overwhelm storm drains.
State-wide data from the New York State Climate Impacts Assessment shows that days with five inches of rain or more have increased by over 100% in the Northeast since the late 50s. Larchmont is right in the crosshairs of that trend. If you’re looking at a house here, check the elevation. Seriously.
Shoulder Seasons: The Reason We Stay
If I'm being honest, September is the best month in Larchmont. Period.
The humidity breaks.
The water is still warm enough to keep the air mild, but the "stickiness" is gone. September is the clearest month of the year, with clear or partly cloudy skies about 63% of the time. It’s perfect for the Larchmont Arts Festival or just walking the dog through the village.
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Spring is... well, it’s a gamble.
One day it’s 70 degrees and the daffodils are popping up near the library, and the next day you’re dealing with a "Spring Surprise" Nor’easter. March is historically our windiest month, with average speeds around 15 mph, which makes those 40-degree days feel much, much colder.
Navigating the Microclimates
There is a noticeable difference between "Larchmont Manor" (the coastal area) and the neighborhoods up by the Sheldrake River.
- The Manor: Cooler summers, milder winters, but higher wind and flood risk.
- The Village/North: Slightly hotter in the summer, more likely to see "sticking" snow in the winter.
Actionable Tips for Living with Larchmont Weather
Stop relying on the generic weather app on your phone that pulls data from LaGuardia or Westchester County Airport (HPN). Those are inland. They don’t account for the Long Island Sound "wash."
- Get a Hyper-Local App: Use something like Weather Underground that pulls from private weather stations (PWS) right in the village. There are several active stations near Larchmont Station and the harbor that give way more accurate real-time data.
- Invest in a "Sump Pump" Strategy: If you have a basement, even if you’re on a hill, the intense rain patterns we’re seeing in 2026 mean you want a backup battery for your pump.
- The April Rule: Don't put your heavy coat in storage until May 1st. You will regret it. The "sound breeze" is real and it is biting.
- Check Tide Charts: If a big storm is coming, the weather in Larchmont NY is only half the story. If a heavy rain coincides with a high tide, the water in the storm drains has nowhere to go. That’s when the streets start to flood.
Larchmont is a beautiful place to live, but you’ve got to respect the elements. Whether it's the sudden summer squalls or the grey doldrums of February, the climate here is part of the town's character. Just keep an umbrella in the car and a fleece near the door, and you'll be fine.