S
M
T
W
T
F
S
26
58°
43°
27
71°
39°
28
58°
42°
29
59°
49°
30
65°
48°
1
67°
38°
2
58°
39°
3
59°
43°
4
70°
51°
5
81°
61°
6
71°
58°
7
67°
42°
8
62°
43°
9
62°
44°
10
66°
47°
11
68°
48°
12
65°
47°
13
66°
49°
14
68°
51°
15
71°
52°
16
77°
55°
17
78°
56°
18
78°
56°
19
77°
55°
20
78°
56°
21
78°
56°
22
75°
49°
23
70°
48°
24
69°
50°
25
70°
50°
26
72°
51°
27
71°
49°
28
71°
52°
29
72°
50°
30
72°
52°
31
73°
59°
1
77°
58°
2
74°
54°
3
74°
58°
4
78°
60°
5
77°
57°
6
80°
60°
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 58° to 81°, with overnight lows between 39° and 61°. The average high for May is 72° 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.
