S
M
T
W
T
F
S
26
45°
27°
27
48°
28°
28
52°
27°
29
63°
27°
30
64°
30°
1
68°
27°
2
64°
32°
3
64°
36°
4
46°
36°
5
63°
36°
6
72°
34°
7
70°
34°
8
72°
28°
9
75°
34°
10
79°
32°
11
79°
32°
12
79°
36°
13
68°
37°
14
73°
32°
15
70°
28°
16
63°
32°
17
48°
27°
18
60°
33°
19
71°
43°
20
74°
44°
21
81°
47°
22
80°
44°
23
79°
40°
24
80°
45°
25
77°
44°
26
78°
43°
27
78°
44°
28
69°
39°
29
70°
41°
30
73°
42°
31
72°
38°
1
74°
43°
2
76°
44°
3
76°
44°
4
77°
43°
5
78°
44°
6
77°
44°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Portola
Portola's May 2026 forecast shows daily high temperatures ranging from 60° to 81°, with overnight lows between 33° and 47°. The average high for May is 75° with an average low of 42°. 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 Portola. See also: June | July | August.
