S
M
T
W
T
F
S
26
65°
51°
27
65°
50°
28
73°
46°
29
76°
49°
30
75°
52°
1
N/A
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
80°
58°
12
79°
59°
13
78°
58°
14
79°
57°
15
78°
54°
16
79°
56°
17
81°
58°
18
82°
58°
19
82°
57°
20
81°
58°
21
82°
58°
22
82°
57°
23
83°
59°
24
84°
59°
25
83°
58°
26
82°
58°
27
82°
57°
28
76°
56°
29
75°
55°
30
76°
55°
31
77°
57°
1
78°
58°
2
81°
57°
3
80°
57°
4
79°
56°
5
78°
56°
6
78°
54°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
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 79° 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.
