S
M
T
W
T
F
S
26
67°
52°
27
68°
52°
28
78°
46°
29
81°
49°
30
80°
53°
1
82°
55°
2
83°
55°
3
71°
57°
4
70°
55°
5
70°
53°
6
80°
49°
7
86°
55°
8
86°
56°
9
88°
56°
10
89°
57°
11
97°
58°
12
76°
57°
13
78°
56°
14
82°
57°
15
82°
58°
16
80°
57°
17
78°
59°
18
82°
56°
19
84°
59°
20
85°
60°
21
86°
58°
22
79°
59°
23
83°
57°
24
81°
55°
25
78°
57°
26
82°
56°
27
76°
52°
28
77°
53°
29
77°
52°
30
80°
54°
31
85°
58°
1
86°
60°
2
87°
61°
3
87°
61°
4
86°
54°
5
79°
55°
6
81°
55°
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 76° to 87°, with overnight lows between 52° and 61°. The average high for May is 82° 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.
