S
M
T
W
T
F
S
26
59°
41°
27
69°
38°
28
62°
40°
29
65°
48°
30
63°
47°
1
64°
42°
2
61°
46°
3
60°
43°
4
72°
42°
5
82°
54°
6
68°
55°
7
65°
49°
8
66°
44°
9
64°
48°
10
77°
47°
11
61°
47°
12
67°
49°
13
73°
54°
14
66°
50°
15
71°
49°
16
81°
58°
17
87°
58°
18
90°
63°
19
93°
63°
20
82°
54°
21
75°
55°
22
77°
57°
23
76°
56°
24
80°
56°
25
78°
52°
26
79°
57°
27
80°
58°
28
80°
58°
29
79°
57°
30
80°
59°
31
78°
58°
1
79°
54°
2
72°
52°
3
73°
51°
4
76°
58°
5
76°
59°
6
80°
58°
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 66° to 93°, with overnight lows between 49° and 63°. 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.
