S
M
T
W
T
F
S
26
65°
51°
27
65°
50°
28
73°
46°
29
76°
49°
30
75°
52°
1
78°
56°
2
82°
55°
3
72°
51°
4
68°
50°
5
68°
53°
6
78°
54°
7
86°
58°
8
86°
57°
9
84°
55°
10
76°
57°
11
77°
58°
12
82°
59°
13
83°
58°
14
78°
54°
15
72°
50°
16
73°
51°
17
73°
51°
18
74°
52°
19
74°
51°
20
75°
51°
21
81°
56°
22
82°
58°
23
82°
57°
24
81°
56°
25
82°
57°
26
82°
57°
27
81°
55°
28
80°
54°
29
80°
52°
30
76°
51°
31
75°
51°
1
76°
52°
2
79°
53°
3
81°
55°
4
83°
56°
5
81°
57°
6
80°
57°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in San Dimas
San Dimas's May 2026 forecast shows daily high temperatures ranging from 68° to 86°, with overnight lows between 50° and 59°. The average high for May is 78° with an average low of 54°. 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 San Dimas. See also: June | July | August.
