S
M
T
W
T
F
S
26
78°
45°
27
68°
45°
28
68°
48°
29
76°
50°
30
68°
47°
1
69°
50°
2
70°
51°
3
73°
56°
4
71°
57°
5
77°
57°
6
80°
58°
7
79°
57°
8
76°
54°
9
80°
55°
10
80°
59°
11
82°
60°
12
82°
60°
13
81°
59°
14
73°
55°
15
78°
60°
16
75°
59°
17
79°
54°
18
75°
53°
19
74°
52°
20
76°
54°
21
80°
61°
22
83°
54°
23
84°
53°
24
75°
52°
25
76°
55°
26
77°
54°
27
77°
56°
28
79°
63°
29
79°
61°
30
86°
64°
31
87°
64°
1
87°
57°
2
80°
56°
3
79°
56°
4
79°
57°
5
83°
58°
6
86°
65°
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 68° to 87°, with overnight lows between 45° and 65°. The average high for May is 78° with an average low of 56°. 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.
