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Monmouth Junction (NJ) Weather and Climate: A Comprehensive Guide

The temperature in Monmouth Junction can vary quite a bit throughout the year. Temperatures can be very warm during the warmest months, and cold during the cooler months. It also has a notably wet climate with much precipitation. Now, let’s explore all the climate details to give you a full picture.

Average maximum day and minimum night temperature

Visitors to Monmouth Junction can expect significant temperature changes throughout the year. Average maximum daytime temperatures range from a very warm 31°C in July, the warmest time of the year, to a chilly 4°C during cooler months like January.

At night, temperatures typically drop to an average of around -6°C during these months. Check out our detailed temperature page for more information.

Temperature ranges by month

Precipitation and rainy days

Monmouth Junction is known for its substantial rain/snowfall, with annual precipitation reaching 1281 mm. While rainfall varies throughout the year, each season offers its own charm. July brings wetter days averaging 132 mm of precipitation, spread over 13 rainy days.

In contrast, November experiences a drier climate, with about 78 mm of rainfall spread across 10 rainy days.

The mean monthly precipitation over the year, including rain, hail and snow

Sunshine over the year

Seasonal changes in sunshine hours are quite dramatic in Monmouth Junction. While July receives considerable daily sunshine with up to 9.0 hours, December marks the darkest time of the year, where sunshine is scarce with only 4.7 hours of sunlight per day. Visit our detailed sunshine hours page for more information.

Monthly hours of sunshine

Data from: Trenton, the United States of America (24 KM, 15 Miles).

Daily hours of sunshine

Data from: Trenton, the United States of America (24 KM, 15 Miles).

Forecast for Monmouth Junction (NJ)

Fri   Dec 27
6°C | -9°C
E 1 m/s
partly cloudy and no rain

partly cloudy and no rain

Sat   Dec 28
8°C | 0°C
SW 2 m/s
5.1 mm
overcast and rain

overcast and rain

Sun   Dec 29
17°C | 7°C
S 7 m/s
3.7 mm
broken clouds and rain

broken clouds and rain

The best time of year to visit Monmouth Junction in the United States of America

During the months of May and September you are most likely to experience good weather with pleasant average temperatures that fall between 20°C and 26°C.

Other facts from our historical weather data:
  • When is summer in Monmouth Junction?
    The hottest season / summer takes place in June, July, August and September.
  • Which is the warmest month in Monmouth Junction?
    July has an average maximum temperature of 31°C and is the warmest month of the year.
  • Which is the coldest month in Monmouth Junction?
    The coldest month is January with an average maximum temperature of 4°C.
  • Which is the wettest month in Monmouth Junction?
    July tops the wettest month list with 132 mm of rainfall.
  • Which is the driest month in Monmouth Junction?
    November is the driest month with 78 mm of precipitation.
  • Which is the sunniest month in Monmouth Junction?
    July is the sunniest month with an average of 269 hours of sunshine.

  • No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.