S
M
T
W
T
F
S
26
72°
49°
27
68°
51°
28
71°
48°
29
65°
45°
30
62°
43°
1
60°
42°
2
62°
41°
3
63°
44°
4
64°
45°
5
72°
51°
6
69°
50°
7
67°
45°
8
71°
51°
9
75°
51°
10
74°
52°
11
73°
52°
12
76°
51°
13
76°
52°
14
75°
49°
15
73°
49°
16
75°
52°
17
76°
54°
18
77°
53°
19
75°
51°
20
72°
45°
21
69°
46°
22
70°
49°
23
71°
50°
24
76°
53°
25
78°
55°
26
79°
56°
27
79°
55°
28
78°
56°
29
79°
56°
30
79°
57°
31
76°
57°
1
78°
54°
2
79°
56°
3
76°
55°
4
79°
56°
5
73°
52°
6
78°
55°
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 60° to 79°, with overnight lows between 41° and 57°. The average high for May is 73° with an average low of 51°. 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.
