S
M
T
W
T
F
S
26
62°
37°
27
71°
33°
28
64°
34°
29
68°
46°
30
61°
47°
1
65°
35°
2
60°
44°
3
61°
37°
4
74°
33°
5
83°
46°
6
69°
54°
7
66°
43°
8
65°
39°
9
65°
46°
10
77°
48°
11
63°
45°
12
68°
38°
13
75°
43°
14
68°
48°
15
67°
46°
16
82°
41°
17
89°
53°
18
94°
56°
19
96°
61°
20
93°
61°
21
62°
55°
22
70°
53°
23
55°
50°
24
58°
54°
25
75°
57°
26
81°
61°
27
83°
63°
28
79°
54°
29
78°
53°
30
75°
50°
31
76°
52°
1
75°
54°
2
76°
55°
3
77°
57°
4
77°
59°
5
79°
60°
6
80°
56°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Riverside
Riverside's May 2026 forecast shows daily high temperatures ranging from 58° to 83°, with overnight lows between 50° and 63°. The average high for May is 76° with an average low of 56°. 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 Riverside. See also: June | July | August.
