S
M
T
W
T
F
S
26
81°
55°
27
81°
55°
28
71°
59°
29
80°
61°
30
68°
51°
1
66°
45°
2
68°
44°
3
68°
37°
4
78°
39°
5
78°
45°
6
76°
64°
7
69°
49°
8
71°
45°
9
73°
49°
10
81°
55°
11
77°
51°
12
75°
50°
13
79°
50°
14
73°
44°
15
78°
40°
16
82°
48°
17
91°
56°
18
87°
64°
19
83°
64°
20
82°
63°
21
75°
65°
22
76°
65°
23
77°
65°
24
78°
64°
25
78°
64°
26
76°
65°
27
77°
64°
28
78°
62°
29
78°
61°
30
77°
61°
31
75°
60°
1
79°
58°
2
82°
63°
3
81°
62°
4
76°
59°
5
76°
58°
6
80°
63°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Flat Rock
Flat Rock's May 2026 forecast shows daily high temperatures ranging from 75° to 83°, with overnight lows between 58° and 65°. The average high for May is 78° with an average low of 62°. 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 Flat Rock. See also: June | July | August.