S
M
T
W
T
F
S
26
90°
78°
27
92°
77°
28
92°
79°
29
91°
77°
30
90°
78°
1
92°
69°
2
74°
62°
3
84°
65°
4
87°
68°
5
90°
76°
6
96°
79°
7
91°
80°
8
92°
77°
9
91°
78°
10
93°
76°
11
91°
70°
12
91°
71°
13
92°
69°
14
92°
68°
15
92°
73°
16
93°
78°
17
92°
81°
18
95°
80°
19
94°
82°
20
92°
71°
21
88°
72°
22
95°
76°
23
88°
77°
24
92°
75°
25
94°
74°
26
92°
77°
27
85°
69°
28
91°
74°
29
92°
74°
30
93°
76°
31
91°
77°
1
92°
77°
2
91°
76°
3
90°
77°
4
88°
78°
5
92°
77°
6
91°
79°
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 88° to 93°, with overnight lows between 76° and 79°. The average high for May is 91° with an average low of 77°. 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.
