S
M
T
W
T
F
S
26
58°
43°
27
56°
43°
28
57°
43°
29
56°
44°
30
59°
49°
1
57°
51°
2
57°
51°
3
55°
50°
4
59°
51°
5
59°
52°
6
58°
52°
7
57°
51°
8
58°
45°
9
57°
45°
10
62°
52°
11
58°
52°
12
60°
51°
13
61°
48°
14
61°
44°
15
60°
46°
16
58°
49°
17
60°
42°
18
62°
39°
19
62°
41°
20
57°
47°
21
56°
49°
22
58°
48°
23
56°
49°
24
55°
48°
25
58°
49°
26
59°
46°
27
63°
50°
28
63°
52°
29
63°
47°
30
62°
42°
31
65°
44°
1
69°
48°
2
72°
49°
3
66°
50°
4
65°
48°
5
64°
49°
6
66°
48°
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 59° to 72°, with overnight lows between 42° and 52°. 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.
