S
M
T
W
T
F
S
26
87°
73°
27
88°
75°
28
92°
75°
29
85°
68°
30
69°
62°
1
62°
52°
2
74°
49°
3
81°
53°
4
82°
59°
5
85°
70°
6
82°
63°
7
74°
58°
8
78°
61°
9
89°
71°
10
88°
70°
11
78°
65°
12
83°
61°
13
88°
61°
14
90°
67°
15
90°
70°
16
88°
71°
17
86°
77°
18
88°
77°
19
87°
71°
20
79°
69°
21
78°
70°
22
78°
71°
23
79°
69°
24
82°
68°
25
83°
69°
26
84°
68°
27
84°
70°
28
85°
68°
29
84°
69°
30
85°
68°
31
88°
67°
1
89°
70°
2
89°
69°
3
86°
68°
4
85°
65°
5
86°
69°
6
88°
71°
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 78° to 89°, with overnight lows between 65° and 77°. The average high for May is 84° with an average low of 69°. 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.
