S
M
T
W
T
F
S
26
71°
52°
27
74°
51°
28
71°
52°
29
72°
53°
30
75°
54°
1
76°
54°
2
74°
55°
3
76°
54°
4
72°
55°
5
76°
54°
6
71°
51°
7
72°
52°
8
72°
51°
9
71°
51°
10
69°
52°
11
70°
51°
12
71°
52°
13
71°
52°
14
72°
53°
15
73°
53°
16
71°
54°
17
70°
53°
18
70°
52°
19
71°
53°
20
72°
57°
21
76°
60°
22
77°
60°
23
76°
57°
24
74°
56°
25
76°
57°
26
78°
59°
27
80°
61°
28
80°
61°
29
79°
60°
30
77°
59°
31
76°
57°
1
74°
54°
2
73°
55°
3
74°
56°
4
74°
55°
5
82°
59°
6
82°
60°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in El Cajon
El Cajon's May 2026 forecast shows daily high temperatures ranging from 69° to 82°, with overnight lows between 51° and 61°. The average high for May is 74° with an average low of 55°. 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 El Cajon. See also: June | July | August.
