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°
57°
20
64°
45°
21
59°
39°
22
68°
40°
23
59°
50°
24
61°
48°
25
81°
48°
26
84°
57°
27
79°
52°
28
71°
50°
29
82°
48°
30
69°
41°
31
76°
47°
1
75°
45°
2
78°
46°
3
81°
52°
4
84°
59°
5
80°
58°
6
76°
57°
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 69° to 84°, with overnight lows between 41° and 59°. The average high for May is 78° with an average low of 50°. 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.
