S
M
T
W
T
F
S
26
90°
61°
27
82°
63°
28
90°
57°
29
91°
68°
30
90°
70°
1
86°
66°
2
68°
55°
3
77°
50°
4
84°
48°
5
86°
57°
6
91°
59°
7
88°
68°
8
86°
66°
9
77°
64°
10
86°
68°
11
91°
68°
12
77°
68°
13
84°
66°
14
88°
61°
15
88°
52°
16
93°
66°
17
95°
68°
18
91°
68°
19
93°
68°
20
91°
66°
21
93°
68°
22
91°
70°
23
91°
73°
24
90°
72°
25
93°
72°
26
91°
73°
27
90°
73°
28
88°
73°
29
92°
72°
30
87°
73°
31
87°
73°
1
91°
74°
2
90°
70°
3
88°
66°
4
88°
66°
5
86°
69°
6
87°
68°
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 86° to 92°, with overnight lows between 66° and 74°. The average high for May is 88° with an average low of 70°. 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.
