Weather in New Jersey: Climate, Seasons, and Average Monthly Temperature

New Jersey is a Northeastern U.S. state that experiences all four seasons, with an expected range of temperatures throughout the year. The weather normally drops to freezing in winter and is exceptionally hot in the summer months, so a winter trip here will be vastly different from a summer beach getaway to the New Jersey shore.

New Jersey, known as the Garden State, is bordered by the Atlantic Ocean to the east, and the Delaware River to the west. The state is also home to many rivers, lakes, and streams, which all contribute to the area’s relatively high humidity year-round.

New Jersey is the fourth-smallest U.S. state, and the weather is very similar throughout its 8,700 square miles. The only “slight” variance in weather would be its 130 miles of Atlantic coastline, referred to as the “Jersey Shore.” Throughout the state, all year long, temperatures are consistent with the seasons. The winter months are usually very cold with January through March hovering between 25 to 35 degrees F (with snow and ice storms a normal occurrence). But during the summertime – between June and August – temperatures usually reach the high 80s F to the high 90s F or above.

When planning a trip to New Jersey, it’s best to confirm the time of year and season before packing for your trip. Here’s what you need to know when planning your visit.  

Fast Climate Facts

• Hottest Month: July (average high temperature is 86 degrees Fahrenheit)
• Coldest Month: January (average high temperature is 40 degrees Fahrenheit)
• Wettest Month: July (5 inches)
• Best Months for Swimming: July and August (average high temperature is 85 degrees Fahrenheit)
• Most Humid Months: July and August (average humidity is 70 percent)

Summer in New Jersey

New Jersey is an interesting destination during the summer, as the weather varies from the shore region to the inland areas. Temperatures and humidity can also vary. From June through August, many residents head to the nearby New Jersey shore to escape the heat, as it is usually slightly cooler by the ocean. However, it does rain a lot in the summer, and the entire area frequently is plagued with late afternoon thunderstorms, especially in July. Be sure to bring an umbrella and raincoat if the forecast calls for rain.

During the warmer months, many New Jersey restaurants and bars open their outdoor terraces and patios. The shore area features many eateries located in harbors and marinas overlooking the water.

What to pack: Pack some shorts and T-shirts in the summer. New Jersey is a very casual state, especially in summer, so plan to be comfortable, especially if you are walking or hiking outdoors or spending time at the beach. Please note that most restaurants, museums, and businesses are air-conditioned, so if you tend to get chilly, you may want to have a sweater handy.  

Average temperatures by month:

• June: 78 degrees F
• July: 87 degrees F
• August: 85 degrees F

Fall in New Jersey

In New Jersey, the Fall season brings a sudden and slight chill in the air. The leaves on the trees begin changing colors and dropping to the ground, and the temperature begins to plummet. Usually in late September through October, there is a chance of an unexpected heatwave.

New Jersey offers perfectly pleasant weather in the fall, as the temperature is mild, and it rains much less than the summertime.

What to pack: Be sure to pack layers, a light jacket, and perhaps a medium-weight sweater or two.

Average temperatures by month:

• September: 70 degrees F
• October: 59 degrees F
• November: 47 degrees F

Winter in New Jersey

No doubt about it, New Jersey is incredibly cold and (mostly) grey in the winter. But there’s still a chance of sunshine and blue skies at times if you’re lucky. However, winter is usually marked with long stretches of misty, cloudy days.

What to pack: Bring your heavy coat and scarf! Plan to wear winter layers, and don’t expect to be outside very much. Expect to frequently use your heavy coat with a sweater underneath. It’s recommended to wear a hat, scarf, gloves, and low boots or warm shoes. If snow is in the forecast, bring your snow boots. If you think you might have to shovel snow, be sure have a ski jacket and waterproof boots and pants.

Average temperatures by month:

• December: 35 degrees F
• January: 30 degrees F
• February: 29 degrees F

Spring in New Jersey

This state begins to warm up in April (There’s still a good chance of snow in March). Although you will start to see signs of spring (beautiful budding flowers and leaves), you can expect rain and chilly temperatures for much of the season. You might notice that inland areas are much warmer than the shore, but it’s not beach weather yet.

What to pack: Spring is very changeable. Be sure to pay attention to the weather forecast as your trip nears because this season can bring an unexpected snowstorm as well as higher-than-normal temperatures. Smart travelers pack layers, a heavy jacket, and a hat. And don’t forget to bring a raincoat and umbrella during this time of year.

Average temperatures by month:

• March: 45 degrees F
• April: 58 degrees F
• May: 70 degrees F

Average Temperatures, Rainfall, and Daylight Hours

If you love to experience the four seasons, you will love New Jersey weather, ranging from blustery wind and frigid cold in winter to excessive heat in the mid-summer months. Here's what to expect in terms of average temperature, inches of rain, and daylight hours throughout the year.