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September in New Jersey marks a transitional period between summer’s heat and autumn’s crispness. Typically, temperatures gradually decrease throughout the month, with average highs ranging from the low 80s Fahrenheit (high 20s Celsius) at the beginning to the low 70s Fahrenheit (low 20s Celsius) by the end. Overnight lows follow a similar trend, shifting from the mid-60s Fahrenheit (high teens Celsius) to the mid-50s Fahrenheit (low teens Celsius). This period often experiences diminishing humidity levels, contributing to more comfortable conditions. Rainfall amounts in September are usually moderate and evenly distributed throughout the month. While hurricane season is still active, the likelihood of direct impacts diminishes as the month progresses.

Understanding the typical climate conditions during this month is crucial for a variety of activities, from planning outdoor events like weddings and festivals to making decisions about fall harvests and landscaping. Historically, this time of year has been significant for agriculture, as it represents the culmination of the growing season for many crops. The shift in weather patterns also influences tourism, as the summer crowds thin out and the fall foliage begins to emerge in the northern parts of the state.

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