S
M
T
W
T
F
S
26
67°
49°
27
79°
49°
28
74°
58°
29
65°
48°
30
59°
43°
1
53°
38°
2
53°
35°
3
63°
33°
4
74°
48°
5
70°
49°
6
60°
41°
7
61°
38°
8
70°
42°
9
74°
55°
10
68°
53°
11
71°
42°
12
74°
45°
13
69°
48°
14
65°
45°
15
67°
41°
16
78°
55°
17
85°
63°
18
87°
69°
19
87°
64°
20
70°
49°
21
68°
53°
22
68°
65°
23
75°
62°
24
78°
62°
25
79°
63°
26
80°
62°
27
79°
62°
28
78°
62°
29
78°
60°
30
79°
61°
31
80°
58°
1
80°
63°
2
81°
62°
3
79°
60°
4
75°
57°
5
75°
56°
6
78°
63°
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 68° to 87°, with overnight lows between 49° and 69°. The average high for May is 78° with an average low of 61°. 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.
