S
M
T
W
T
F
S
26
68°
39°
27
71°
49°
28
60°
46°
29
53°
40°
30
50°
39°
1
46°
39°
2
52°
41°
3
58°
45°
4
60°
46°
5
65°
47°
6
58°
47°
7
65°
49°
8
60°
49°
9
63°
39°
10
60°
42°
11
60°
44°
12
62°
44°
13
61°
41°
14
60°
40°
15
61°
41°
16
62°
42°
17
63°
43°
18
69°
53°
19
69°
47°
20
64°
43°
21
64°
44°
22
65°
46°
23
67°
51°
24
74°
55°
25
74°
53°
26
67°
48°
27
66°
47°
28
68°
52°
29
74°
55°
30
76°
56°
31
77°
57°
1
77°
57°
2
78°
58°
3
79°
58°
4
78°
54°
5
70°
50°
6
74°
58°
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 46° to 79°, with overnight lows between 39° and 58°. The average high for May is 65° with an average low of 48°. 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.
