Historical weather data, all-time temperature records, and monthly climate averages for Smithtown, NY. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5th in Smithtown typically lands in that shoulder-season sweet spot — average highs of 54° with lows still dipping to 37° overnight. The date has seen some wild swings over 62 years of records, from a balmy 68° back in 1988 to a brutal 24° low in 1995. Snow is nearly off the table at just a 2% chance, though there's about a 1-in-3 shot of some rain.
Smithtown's weather has real range — the thermometer has touched both 104° (July 3, 1966) and -14° (February 13, 1967), a swing of 118 degrees over the station's history. The wettest single day on record was a staggering 13.51 inches on August 13, 2014, and a January 2022 nor'easter dropped 23.5 inches of snow in a single day. This is a place that can genuinely surprise you in any season.
Summer is the clear headline season, with highs peaking around 82-84° in mid-July and staying warm through August. Winter settles in hard by mid-January, when average highs scrape just 37°. If you're watching for rain, late summer is the wettest stretch — August averages more precipitation than any other month, and the record books back that up.