S
M
T
W
T
F
S
26
63°
40°
27
72°
37°
28
64°
38°
29
64°
47°
30
60°
47°
1
63°
36°
2
60°
44°
3
60°
41°
4
72°
39°
5
82°
50°
6
67°
50°
7
64°
45°
8
59°
40°
9
58°
48°
10
70°
49°
11
62°
45°
12
67°
35°
13
68°
51°
14
65°
45°
15
65°
44°
16
80°
57°
17
84°
54°
18
80°
57°
19
89°
64°
20
77°
51°
21
67°
48°
22
69°
48°
23
68°
51°
24
69°
50°
25
68°
49°
26
72°
50°
27
67°
50°
28
66°
48°
29
66°
50°
30
67°
55°
31
74°
52°
1
67°
50°
2
68°
48°
3
67°
48°
4
68°
49°
5
69°
56°
6
74°
57°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Hackettstown
Hackettstown's May 2026 forecast shows daily high temperatures ranging from 65° to 89°, with overnight lows between 44° and 64°. The average high for May is 71° 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 Hackettstown. See also: June | July | August.
