Historical weather data, all-time temperature records, and monthly climate averages for Mastic, NY. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4 in Mastic splits the difference between winter and spring — expect a high around 53° and a low near 37°, with a coin-flip chance of rain. The date has swung from a balmy 64° in 2010 to a teeth-chattering 25° in 2013, so the range is real. No snow on the radar, at least.
Mastic has seen some true extremes over its 33-year record: a punishing 101° in July 1999 and a brutal -7° in February 2015, a 108-degree swing that captures Long Island at its most unforgiving. The snowiest single day on record dropped 30.3 inches in February 2013, and a remnant storm in October 2005 dumped nearly 7 inches of rain in one go.
Summer is the sweet spot — highs peak around 82-84° in mid-July, making it prime beach weather for this coastal South Shore location. Winter settles in hard by late January, with average highs barely cracking 37°. December is surprisingly the wettest stretch of the year, averaging 1.33 inches in its soggiest week, so pack accordingly for holiday visits.