Historical weather data, all-time temperature records, and monthly climate averages for Mercerville, NJ. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5th in Mercerville typically lands right in the middle of spring's awakening, with average highs near 59° and lows still dipping into the mid-30s at night. The date has a 60-degree swing in its history — from a balmy 82° back in 1910 to a bitter 22° low in 1995. There's a coin-flip-ish 44% chance of rain, though snow is nearly off the table at just 3%.
Mercerville has seen some serious weather extremes over its 130-plus years of records. Summer 1936 brought a scorching 105° — the hottest day on record — while January 1935 dropped to a brutal -16°. The location also caught the tail end of Hurricane Irene in August 2011, logging a remarkable 7.89 inches of rain in a single day.
Mercerville runs warm and humid in summer, with highs peaking around 87° in mid-July and staying in the mid-80s through August. If you're cold-averse, avoid January and February, when highs barely clear 40°. Rain is fairly spread throughout the year, but July is the wettest stretch — expect afternoon downpours if you're visiting in peak summer.