S
M
T
W
T
F
S
26
52°
34°
27
54°
34°
28
46°
30°
29
50°
21°
30
48°
19°
1
54°
28°
2
64°
23°
3
64°
23°
4
61°
28°
5
48°
32°
6
46°
25°
7
63°
19°
8
68°
32°
9
68°
37°
10
68°
27°
11
77°
28°
12
79°
30°
13
82°
32°
14
75°
41°
15
75°
28°
16
77°
37°
17
54°
35°
18
39°
27°
19
39°
31°
20
50°
34°
21
58°
38°
22
60°
40°
23
65°
45°
24
68°
46°
25
70°
44°
26
70°
47°
27
63°
45°
28
66°
44°
29
69°
47°
30
67°
40°
31
63°
43°
1
61°
44°
2
61°
42°
3
60°
35°
4
63°
40°
5
66°
41°
6
67°
42°
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 39° to 70°, with overnight lows between 27° and 47°. The average high for May is 61° with an average low of 40°. 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.
