S
M
T
W
T
F
S
26
51°
33°
27
57°
32°
28
57°
25°
29
58°
30°
30
44°
32°
1
52°
30°
2
63°
27°
3
66°
32°
4
63°
37°
5
57°
34°
6
38°
27°
7
63°
22°
8
71°
32°
9
70°
32°
10
70°
37°
11
78°
33°
12
81°
38°
13
80°
39°
14
76°
48°
15
76°
42°
16
77°
44°
17
64°
44°
18
55°
41°
19
53°
37°
20
56°
32°
21
68°
37°
22
67°
32°
23
69°
31°
24
62°
36°
25
61°
39°
26
57°
35°
27
59°
36°
28
66°
39°
29
68°
36°
30
66°
40°
31
63°
36°
1
64°
40°
2
68°
42°
3
68°
43°
4
70°
40°
5
70°
41°
6
67°
35°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Princeton
Princeton's May 2026 forecast shows daily high temperatures ranging from 57° to 70°, with overnight lows between 35° and 43°. The average high for May is 65° with an average low of 38°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how May weather will actually feel in Princeton. See also: June | July | August.
