S
M
T
W
T
F
S
26
66°
39°
27
71°
42°
28
61°
46°
29
51°
41°
30
54°
34°
1
46°
31°
2
53°
28°
3
63°
36°
4
75°
46°
5
63°
45°
6
54°
37°
7
55°
35°
8
64°
31°
9
67°
40°
10
59°
30°
11
59°
36°
12
63°
34°
13
56°
43°
14
67°
43°
15
71°
39°
16
81°
51°
17
84°
53°
18
86°
50°
19
80°
48°
20
62°
39°
21
61°
43°
22
65°
49°
23
59°
52°
24
70°
52°
25
73°
52°
26
76°
55°
27
80°
56°
28
78°
58°
29
75°
53°
30
78°
57°
31
77°
56°
1
75°
51°
2
76°
56°
3
69°
54°
4
69°
52°
5
70°
55°
6
74°
58°
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 59° to 80°, with overnight lows between 39° and 58°. The average high for May is 72° with an average low of 52°. 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.
