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Weather in Smithtown, NY · National Weather Service + NOAA

Smithtown has milder winters than most of New York

Smithtown has chilly, snowy winters and pleasant summers. A typical July afternoon reaches 83°, a January night drops to 25°, and about 32 inches of snow falls in a normal winter. Normal November highs come to 54°, and lows to 38°.

Winter 42°/27°Spring 59°/41°Summer 81°/64°Fall 65°/48°
Right now
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Sunrise 6:24 am · sunset 4:47 pm

Getting the latest forecast from the National Weather Service…

What stands out about Smithtown’s weather

Read from 30 years of NOAA records. Each one opens the full story on the Climate page.

Climate →
Milder winters than most of New YorkJanuary nights average 25°, milder than 2,046 of 2,223 New York towns.Warming faster than mostThe last 30 years averaged 2.3° warmer than the 1900s, a bigger shift than 99% of U.S. towns.A long growing season207 frost-free days, from Apr 10 to Nov 2.
A normal year

Where today sits in Smithtown’s year

Typical highs and lows month by month, from 30 years of NOAA records.

Full climate →
Winter
42° / 27°
8 days with an inch or more of snow
Spring
59° / 41°
Last frost around Apr 10
Summer
81° / 64°
8 days reach 90° in a normal year
Fall now
65° / 48°
First frost around Nov 2
Todayis the usual first frost
Best months to be outside
MayJunJulAugSepOct
Highs of 62–84° and lows of 40° or more
How much snow does Smithtown get?About 32 inches a winter.When is it wettest?December, with 4.5 inches.Is it warmer than it used to be?+2.3° vs. the 20th century.

Weather talk

Road reports, first frosts and storm memories from neighbors in Smithtown.

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Forecast, conditions and alerts: National Weather Service. Climate: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000. Temperatures and rainfall come from NOAA’s gridded normals for Smithtown itself (about a 3-mile square). Snow, frost dates and day counts: the NOAA station at Islip Li Macarthur Airport, NY (10 mi). Sunrise and sunset are calculated from the town’s position. Normals are 30-year averages, not a forecast.