S
M
T
W
T
F
S
26
62°
52°
27
67°
48°
28
70°
47°
29
76°
50°
30
76°
49°
1
74°
52°
2
71°
52°
3
67°
53°
4
64°
53°
5
66°
54°
6
71°
54°
7
70°
53°
8
75°
52°
9
88°
53°
10
90°
55°
11
87°
53°
12
85°
55°
13
84°
53°
14
80°
53°
15
78°
54°
16
77°
52°
17
79°
54°
18
78°
51°
19
80°
55°
20
82°
55°
21
81°
53°
22
80°
53°
23
82°
55°
24
83°
55°
25
83°
54°
26
82°
54°
27
76°
53°
28
75°
53°
29
76°
54°
30
76°
54°
31
77°
56°
1
80°
56°
2
82°
55°
3
81°
56°
4
76°
55°
5
77°
54°
6
75°
53°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Vallejo
Vallejo's May 2026 forecast shows daily high temperatures ranging from 64° to 90°, with overnight lows between 51° and 56°. The average high for May is 79° with an average low of 54°. 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 Vallejo. See also: June | July | August.
