S
M
T
W
T
F
S
26
66°
51°
27
70°
46°
28
76°
47°
29
82°
48°
30
85°
52°
1
82°
54°
2
71°
53°
3
68°
53°
4
64°
52°
5
68°
53°
6
76°
57°
7
83°
54°
8
84°
52°
9
89°
55°
10
86°
54°
11
94°
54°
12
86°
57°
13
82°
55°
14
89°
54°
15
91°
52°
16
83°
50°
17
79°
60°
18
85°
59°
19
90°
54°
20
92°
54°
21
94°
57°
22
89°
56°
23
81°
54°
24
80°
52°
25
71°
52°
26
71°
53°
27
75°
49°
28
72°
56°
29
74°
52°
30
83°
54°
31
91°
56°
1
92°
54°
2
93°
55°
3
94°
60°
4
95°
56°
5
89°
57°
6
87°
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 72° to 95°, with overnight lows between 52° and 60°. The average high for May is 87° 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.
