Mild
Average highs are around 25°C, so days are mild rather than hot.
September verdict
Princeton, New Jersey, United States in September
Weather score58Good
Good for holiday weather
Average highs are around 25°C, so days are mild rather than hot. Sunshine averages 7.1h per day, enough for a balanced month. Rainfall averages 104mm, so some wet days are possible.
September weather
Monthly averages
Temp
25°C
Rain
104mm
Sun
7.1h
Sea
22°C
Weather score
58
Good
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Showers
Rainfall averages 104mm, so some wet days are possible.
Some sun
Sunshine averages 7.1h per day, enough for a balanced month.
Cool sea
Sea temperatures average 22°C, so the water can feel cool.
Map
Weather map
Compare Princeton, New Jersey, United States with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
September25°C average high
September sits in the warmer part of the year, so midday sightseeing can feel heavier than in cooler months.
Warmest monthsJune to September
This stretch sets the upper range for average daytime heat.
Rain
September104mm average rain
September sits near Princeton's yearly rainfall average, so rain is a normal planning factor rather than an outlier.
Driest monthsJanuary to June and September to December
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
September7.1 hours average sun
September sits close to Princeton's yearly sunshine average, so it is a middle-of-the-pack month for bright days.
Brightest monthsMay to August
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
September22°C average sea
September is one of Princeton's warmest sea months, when swimming comfort is usually strongest.
Warmest seaJuly to September
Sea temperatures are usually near 23°C in this stretch, so swimming comfort is at its strongest.
Weather score
September58 weather score
September scores above Princeton's yearly average, so the overall weather mix is stronger than most months.
Best weather monthsJune to August
These months have the strongest weather score in the monthly averages.
