S
M
T
W
T
F
S
26
77°
49°
27
75°
53°
28
63°
48°
29
61°
40°
30
57°
36°
1
57°
35°
2
62°
34°
3
77°
46°
4
83°
41°
5
61°
43°
6
57°
37°
7
68°
33°
8
75°
45°
9
75°
49°
10
71°
42°
11
71°
40°
12
82°
49°
13
74°
47°
14
78°
57°
15
84°
63°
16
84°
65°
17
84°
69°
18
82°
60°
19
77°
51°
20
67°
47°
21
65°
49°
22
70°
51°
23
75°
54°
24
78°
58°
25
79°
57°
26
80°
59°
27
76°
54°
28
76°
57°
29
74°
54°
30
71°
55°
31
72°
55°
1
72°
51°
2
73°
54°
3
73°
60°
4
79°
62°
5
82°
63°
6
82°
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 65° to 84°, with overnight lows between 47° and 69°. The average high for May is 76° with an average low of 57°. 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.
