Historical weather data, all-time temperature records, and monthly climate averages for Somerville, NJ. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5th in Somerville sits right in the heart of spring's unpredictability — the average high is a mild 58°, but this date has seen everything from a balmy 77° (2010) to a bitter 21° low (1995). Nearly half of all April 5ths on record have seen some precipitation, so keep an umbrella handy. The good news: snow is essentially off the table.
Somerville's weather has real range — from a scorching 105° on July 7, 2010 to a brutal -13° on January 22, 1984, that's a 118-degree swing between extremes. The wettest single day on record dumped nearly 8 inches of rain (7.96" on August 28, 2011, courtesy of Hurricane Irene), and a February 2006 snowstorm buried the area under 19.8" in a single day.
Summer is the main event in Somerville, with average highs peaking around 88° in late July — though late July is also the wettest stretch of the year, averaging nearly 1.4" per week. If you're after cool and dry, mid-January is the coldest period with average highs of just 38°. Spring and fall offer the most comfortable temperatures, with April and October averaging highs in the low-to-mid 60s.