Historical weather data, all-time temperature records, and monthly climate averages for Holtsville, NY. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4th in Holtsville sits right in that transitional sweet spot — expect a high near 53° and a low around 38°, though history shows it can swing wildly, from a balmy 75° in 2010 to a bitter 26° back in 1972. Flip a coin on rain: there's a 48% chance of precipitation today.
Holtsville has seen some serious extremes over its 63-year record — a scorching 104° in July 1966 on one end, and a bone-chilling -14° in February 1967 on the other. The wettest single day on record dropped a staggering 13.51 inches in August 2014, and a January 2022 snowstorm buried the area under 23.5 inches in one shot.
Summer is the main event here, with highs peaking around 82–84° in mid-July before the slow fade into fall. Winters are cold and real — January and February hover in the upper 30s to 40s for highs, with the coldest stretch typically landing around January 15–21. August is your wettest month, so pack accordingly if you're visiting late summer.