S
M
T
W
T
F
S
26
62°
46°
27
77°
43°
28
74°
55°
29
62°
46°
30
57°
37°
1
55°
34°
2
51°
30°
3
62°
29°
4
73°
50°
5
72°
58°
6
61°
40°
7
60°
35°
8
68°
38°
9
72°
52°
10
68°
45°
11
66°
39°
12
71°
44°
13
70°
48°
14
64°
41°
15
71°
36°
16
76°
49°
17
85°
59°
18
90°
62°
19
89°
66°
20
72°
51°
21
67°
49°
22
63°
53°
23
77°
62°
24
73°
61°
25
77°
59°
26
79°
57°
27
74°
55°
28
78°
46°
29
76°
51°
30
75°
46°
31
76°
48°
1
74°
49°
2
74°
50°
3
75°
55°
4
79°
60°
5
80°
60°
6
79°
57°
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 74° to 80°, with overnight lows between 46° and 60°. The average high for May is 76° with an average low of 52°. 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.
