S
M
T
W
T
F
S
26
59°
44°
27
58°
42°
28
64°
47°
29
63°
46°
30
65°
48°
1
65°
48°
2
64°
47°
3
59°
43°
4
61°
44°
5
66°
48°
6
65°
46°
7
59°
43°
8
59°
45°
9
62°
47°
10
65°
48°
11
67°
48°
12
67°
50°
13
66°
49°
14
62°
44°
15
66°
51°
16
65°
51°
17
68°
52°
18
70°
50°
19
69°
48°
20
66°
47°
21
64°
52°
22
69°
50°
23
71°
49°
24
67°
48°
25
66°
48°
26
68°
49°
27
64°
47°
28
63°
52°
29
70°
53°
30
71°
48°
31
72°
46°
1
71°
48°
2
71°
53°
3
70°
50°
4
66°
50°
5
66°
53°
6
70°
53°
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 58° to 72°, with overnight lows between 42° and 53°. The average high for May is 66° 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.
