Historical weather data, all-time temperature records, and monthly climate averages for Hillside, NJ. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4th in Hillside sits right in the heart of spring's unpredictability — 175 years of data put the average high at 56° and low at 38°, but this date has swung from a scorching 82° in 1950 to a brutal 23° in 1954. There's a 39% chance of rain today, though snow is nearly off the table at just 2%.
Hillside's weather history is not for the faint of heart — the thermometer has reached 108° in July 2011 and plunged to -14° in February 1934, a swing of 122 degrees. On the precipitation side, a single August day in 1843 dumped 15 inches of rain, and the day after Christmas 1947 buried the area under 25.9 inches of snow.
Summer is Hillside's main event, with highs peaking around 85-86° in mid-to-late July and the wettest stretch of the year arriving right on summer's heels in late July. Winter bottoms out the second week of January with average highs barely scraping 37°. Spring and fall offer the most comfortable conditions, with April hitting 60° and October averaging a pleasant 65°.