S
M
T
W
T
F
S
26
62°
40°
27
61°
41°
28
62°
39°
29
64°
42°
30
63°
39°
1
63°
43°
2
64°
43°
3
69°
46°
4
64°
41°
5
63°
41°
6
63°
42°
7
65°
48°
8
70°
42°
9
65°
43°
10
64°
42°
11
64°
43°
12
66°
53°
13
77°
55°
14
78°
56°
15
78°
54°
16
75°
48°
17
69°
52°
18
74°
55°
19
79°
58°
20
80°
56°
21
79°
51°
22
70°
51°
23
70°
48°
24
71°
49°
25
74°
50°
26
80°
58°
27
82°
58°
28
80°
59°
29
82°
59°
30
83°
57°
31
79°
53°
1
79°
51°
2
73°
50°
3
73°
50°
4
74°
52°
5
75°
53°
6
77°
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 61° to 83°, with overnight lows between 39° and 60°. The average high for May is 72° with an average low of 49°. 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.
