S
M
T
W
T
F
S
26
64°
52°
27
64°
49°
28
71°
51°
29
74°
53°
30
74°
55°
1
75°
56°
2
77°
56°
3
69°
53°
4
67°
52°
5
68°
51°
6
77°
57°
7
83°
60°
8
84°
60°
9
81°
58°
10
83°
59°
11
84°
60°
12
80°
60°
13
81°
58°
14
80°
59°
15
79°
56°
16
80°
58°
17
82°
60°
18
83°
61°
19
83°
61°
20
82°
60°
21
83°
61°
22
83°
61°
23
84°
62°
24
85°
62°
25
84°
61°
26
83°
62°
27
83°
61°
28
77°
59°
29
76°
60°
30
77°
59°
31
78°
61°
1
79°
62°
2
82°
61°
3
81°
62°
4
80°
61°
5
79°
60°
6
79°
58°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Altadena
Altadena's May 2026 forecast shows daily high temperatures ranging from 67° to 85°, with overnight lows between 51° and 62°. The average high for May is 80° with an average low of 59°. 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 Altadena. See also: June | July | August.
