S
M
T
W
T
F
S
26
82°
61°
27
85°
67°
28
67°
55°
29
65°
50°
30
68°
51°
1
68°
51°
2
71°
50°
3
84°
49°
4
81°
64°
5
71°
51°
6
64°
49°
7
74°
44°
8
81°
53°
9
83°
54°
10
71°
58°
11
79°
50°
12
82°
53°
13
82°
62°
14
84°
63°
15
83°
72°
16
86°
77°
17
86°
73°
18
89°
79°
19
81°
57°
20
64°
56°
21
68°
58°
22
N/A
23
78°
62°
24
85°
63°
25
84°
64°
26
78°
64°
27
78°
65°
28
77°
64°
29
80°
63°
30
81°
61°
31
83°
61°
1
86°
65°
2
84°
64°
3
83°
64°
4
84°
63°
5
84°
67°
6
79°
67°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
May Weather in Keystone Lake
Keystone Lake's May 2026 forecast shows daily high temperatures ranging from 77° to 86°, with overnight lows between 61° and 67°. The average high for May is 82° with an average low of 64°. 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 Keystone Lake. See also: June | July | August.
