S
M
T
W
T
F
S
26
81°
51°
27
83°
61°
28
66°
55°
29
64°
50°
30
67°
40°
1
64°
44°
2
61°
44°
3
78°
41°
4
79°
58°
5
70°
46°
6
63°
43°
7
68°
39°
8
76°
54°
9
83°
57°
10
68°
47°
11
75°
50°
12
81°
58°
13
74°
50°
14
72°
56°
15
76°
58°
16
78°
60°
17
83°
63°
18
83°
65°
19
82°
65°
20
83°
68°
21
78°
60°
22
71°
56°
23
73°
57°
24
74°
60°
25
74°
60°
26
75°
58°
27
75°
59°
28
76°
58°
29
76°
58°
30
80°
63°
31
81°
63°
1
82°
67°
2
81°
65°
3
84°
67°
4
85°
68°
5
85°
69°
6
84°
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 68° to 85°, with overnight lows between 47° and 69°. The average high for May is 78° 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.
