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
78°
54°
3
67°
54°
4
65°
52°
5
64°
53°
6
76°
48°
7
80°
53°
8
78°
56°
9
83°
57°
10
84°
56°
11
90°
57°
12
71°
56°
13
75°
53°
14
78°
57°
15
77°
59°
16
76°
57°
17
75°
57°
18
79°
57°
19
82°
58°
20
78°
57°
21
76°
59°
22
77°
58°
23
76°
57°
24
78°
56°
25
77°
56°
26
80°
55°
27
74°
51°
28
75°
52°
29
75°
51°
30
78°
52°
31
81°
56°
1
84°
57°
2
84°
59°
3
85°
59°
4
83°
54°
5
77°
54°
6
80°
55°
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 74° to 85°, with overnight lows between 51° and 59°. The average high for May is 78° with an average low of 56°. 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.
