Average data for 10 years
1 September
Sunday
+27°
+21°
2 September
Monday
+26°
+21°
3 September
Tuesday
+26°
+21°
4 September
Wednesday
+26°
+20°
5 September
Thursday
+24°
+20°
6 September
Friday
+25°
+18°
7 September
Saturday
+26°
+20°
8 September
Sunday
+24°
+19°
9 September
Monday
+24°
+20°
10 September
Tuesday
+25°
+19°
11 September
Wednesday
+23°
+19°
12 September
Thursday
+23°
+18°
13 September
Friday
+24°
+17°
14 September
Saturday
+25°
+18°
15 September
Sunday
+22°
+18°
16 September
today
+21°
+16°
17 September
tomorrow
+22°
+15°
18 September
Wednesday
+23°
+17°
19 September
Thursday
+22°
+17°
20 September
Friday
+23°
+16°
21 September
Saturday
+24°
+18°
22 September
Sunday
+24°
+18°
23 September
Monday
+24°
+18°
24 September
Tuesday
+22°
+19°
25 September
Wednesday
+21°
+16°
26 September
Thursday
+22°
+17°
27 September
Friday
+23°
+19°
28 September
Saturday
+22°
+18°
29 September
Sunday
+20°
+17°
30 September
Monday
+18°
+15°
September in Princeton is the sunniest month of the year. In September, the weather in Princeton is typically warm. Average daily high temperature in September is about 23 degrees above zero. On average, Princeton has 15 sunny, 8 partly cloudy, and 7 rainy days in September. The rains are usually heavy. September as well as August is considered the most comfortable time to visit Princeton.