Historical weather data, all-time temperature records, and monthly climate averages for Harrison, NJ. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4th in Harrison runs mild but unpredictable — the average high of 57° and low of 41° tell only part of the story. Over the past 30 years, this date has swung from a balmy 77° in 2010 to a teeth-chattering 31° in 2001. Rain is more likely than not, with a 57% chance of precipitation, but you can leave the snow shovel in the garage.
Harrison has seen genuine weather extremes over the past three decades — from a scorching 107° on July 22, 2011 to a bitter 0° on January 16, 2004. A single day in September 2021 dumped 8.59 inches of rain, and the Blizzard of '96 buried the area under 25 inches of snow on January 8th.
Summer is the main event here, with highs averaging 90° during the warmest week of mid-July — peak heat if that's your thing, miserable if it's not. Come January, expect highs only around 39°, and pack layers through March. The wettest stretch falls in late July, so summer travel means heat and humidity with the occasional heavy downpour thrown in.