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Current
Hourly
7 Days
14 Days
Weekend
Monthly
Precipitation
Temperature
Wind
Temperature Unit Selection
°Celsius
°Fahrenheit
Monthly Historical Averages
Princeton, NJ
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September
Average Temperature
High
25°
Feels 26
Low
14°
Feels 14
Average Precipitation
9 Days
Rain amount
74.9mm
Snow amount
0cm
Content continues below
Daily Historical Averages
September 2026
S
M
T
W
T
F
S
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
23°
21
20°
22
15°
23
17°
24
15°
25
17°
26
20°
27
19°
28
21°
29
21°
30
22°
Forecast
Sunday, September 20, 2026
Day
23°
Feels 23
Wind
18 km/h S
Gust
27 km/h
Humidity
83%
P.O.P
90%
Rain
~10 mm
Night
18°
Feels 17
Wind
19 km/h N
Gust
29 km/h
Humidity
100%
P.O.P
90%
Rain
~5 mm
Historical Averages
Sep 20
High
Feels
Low
Feels
Precip Frequency
Total Daylight
Humidity
Historical Averages are based on data recorded from 2000 onwards.