S
M
T
W
T
F
S
26
59°
41°
27
69°
38°
28
62°
40°
29
65°
48°
30
63°
47°
1
64°
47°
2
59°
40°
3
59°
43°
4
70°
51°
5
80°
57°
6
68°
51°
7
60°
39°
8
58°
40°
9
61°
46°
10
66°
48°
11
65°
48°
12
64°
49°
13
63°
46°
14
65°
48°
15
66°
50°
16
67°
49°
17
67°
49°
18
68°
54°
19
75°
54°
20
74°
53°
21
70°
55°
22
76°
52°
23
72°
53°
24
76°
53°
25
70°
48°
26
70°
52°
27
69°
56°
28
73°
57°
29
78°
57°
30
77°
56°
31
76°
55°
1
73°
50°
2
70°
50°
3
69°
50°
4
72°
51°
5
71°
51°
6
72°
52°
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 58° to 80°, with overnight lows between 39° and 57°. The average high for May is 69° with an average low of 50°. 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.
