No doubt about it, New Jersey is incredibly cold and (mostly) grey in the winter. 42.2 °F: What's the Average Temperature in New Jersey? Jersey City, New Jersey - Travel and vacation weather averages, current conditions and forecasts. Average Weather in Newark New Jersey, United States. However, it does rain a lot in the summer, and the entire area frequently is plagued with late afternoon thunderstorms, especially in July. Here’s what you need to know when planning your visit. Climate-Charts.com; USA Charts; World Charts Average Temperatures, Rainfall, and Daylight Hours. The state is also home to many rivers, lakes, and streams, which all contribute to the area’s relatively high humidity year-round. The next ten warmest months have occurred in July, with the warmest August averaging 76.8° in 2016, which is tied with July 1994 as the 11th warmest month … But during the summertime – between June and August – temperatures usually reach the high 80s F to the high 90s F or above. Annual Sunshine for New Jersey The longest days in New Jersey are in June , with an average of 15 hours of daylight per day. Water temperature in New Jersey today New Jersey sea surface temperature today Sea water temperature throughout New Jersey is not yet warm enough for swimming and does not exceed 20°C/68°F. Average temperatures for June at cities, towns, parks and lakes throughout New Jersey are listed below in degrees Fahrenheit and Celsius. An average of 13.50°C | 56.30°F water temperatures is reached in Jersey City (Atlantic Ocean) over the year. Daily low temperatures decrease by 4°F, from 71°F to 66°F, rarely falling below 58°F or exceeding 76°F. Monthly and yearly averages for Atlantic water temperatures from Cape May to Sandy Hook. WHAT TO WEAR IN JULY. The best month to swim in the sea is in August when the average sea temperature is 17°C (63°F). Be sure to bring an umbrella and raincoat if the forecast calls for rain. New Jersey offers perfectly pleasant weather in the fall, as the temperature is mild, and it rains much less than the summertime. Expect to frequently use your heavy coat with a sweater underneath. Station Data. Monthly averages Flemington Longitude: -74.86, Latitude: 40.51 Average weather Flemington, NJ - 8822. Also the historical New Jersey weather info such as snow/precipitations data as well as heating and cooling cost index. The statewide average temperature of 78.8° was 4.2° above the 1981–2010 normal. Daily high temperatures decrease by 4°F, from 85°F to 80°F, rarely falling below 73°F or exceeding 92°F. Hottest temperature ever recorded: 110 F, Runyon, central New Jersey, 7/10/1936; Coldest temperature ever recorded: -34 F, River Vale, northeastern New Jersey, 1/5/1904; Hottest location ranked by highest average annual temperature: Cape May, southern New Jersey, 55.3 F; Coldest location ranked by lowest average annual temperature: Sussex, northern New Jersey… The statewide monthly average temperature of 38.9° was 1.9° below the 1981–2010 average. Check the current conditions for Jersey City, NJ for the day ahead, with radar, hourly, and up to the minute forecasts. What to pack: Spring is very changeable. Be prepared for the day. July is the hottest month for New Jersey with an average high temperature of 85.1°, which ranks it as about average compared to other states. During the warmer months, many New Jersey restaurants and bars open their outdoor terraces and patios. If you think you might have to shovel snow, be sure have a ski jacket and waterproof boots and pants. The shore area features many eateries located in harbors and marinas overlooking the water. Thus, the mean temperature average in november in New Jersey is 50°F. You might notice that inland areas are much warmer than the shore, but it’s not beach weather yet. What to pack: Bring your heavy coat and scarf! At -1.5 °C | 29.3 °F on average, January is the coldest month of the year. No one says snow and cold spells are things of the past. Plan to wear winter layers, and don’t expect to be outside very much. This reading surpasses by 0.4° the previous record held jointly by 1955, 1999, and 2011. Get the monthly weather forecast for Newark, NJ, including daily high/low, historical averages, to help you plan ahead. Average annual air temperatures in Jersey since 1900. Jersey, United Kingdom: Annual Weather Averages July is the hottest month in Jersey with an average temperature of 16.5°C (62°F) and the coldest is January at 5.5°C (42°F) with the most daily sunshine hours at 8 in July. 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