S
M
T
W
T
F
S
26
66°
50°
27
67°
51°
28
72°
57°
29
74°
60°
30
73°
59°
1
76°
58°
2
67°
53°
3
67°
53°
4
68°
52°
5
70°
59°
6
78°
60°
7
77°
61°
8
77°
56°
9
69°
55°
10
69°
56°
11
70°
59°
12
74°
61°
13
74°
62°
14
80°
63°
15
81°
64°
16
79°
63°
17
76°
62°
18
73°
57°
19
72°
55°
20
73°
63°
21
73°
63°
22
76°
58°
23
77°
59°
24
77°
60°
25
79°
59°
26
76°
58°
27
77°
61°
28
77°
64°
29
81°
64°
30
82°
59°
31
79°
60°
1
79°
60°
2
82°
63°
3
85°
68°
4
86°
68°
5
86°
67°
6
87°
68°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in St. Louis
St. Louis's May 2026 forecast shows daily high temperatures ranging from 66° to 87°, with overnight lows between 50° and 68°. The average high for May is 76° with an average low of 60°. 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 St. Louis. See also: June | July | August.
