S
M
T
W
T
F
S
26
77°
54°
27
75°
50°
28
63°
48°
29
59°
41°
30
63°
39°
1
63°
37°
2
61°
39°
3
75°
46°
4
84°
50°
5
57°
46°
6
59°
39°
7
70°
37°
8
72°
45°
9
82°
50°
10
70°
41°
11
77°
50°
12
82°
54°
13
77°
48°
14
79°
46°
15
88°
59°
16
80°
65°
17
88°
68°
18
87°
61°
19
67°
45°
20
65°
49°
21
67°
50°
22
76°
56°
23
80°
58°
24
82°
57°
25
75°
56°
26
80°
59°
27
82°
58°
28
79°
59°
29
76°
54°
30
78°
60°
31
80°
62°
1
81°
60°
2
79°
60°
3
72°
55°
4
72°
56°
5
79°
61°
6
78°
62°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Lancaster
Lancaster's May 2026 forecast shows daily high temperatures ranging from 65° to 88°, with overnight lows between 45° and 68°. The average high for May is 77° with an average low of 58°. 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 Lancaster. See also: June | July | August.
