S
M
T
W
T
F
S
26
62°
52°
27
67°
48°
28
70°
47°
29
76°
50°
30
76°
49°
1
71°
54°
2
66°
54°
3
67°
52°
4
67°
53°
5
68°
53°
6
78°
54°
7
77°
53°
8
76°
55°
9
80°
53°
10
82°
55°
11
84°
54°
12
85°
55°
13
85°
55°
14
77°
49°
15
73°
51°
16
72°
51°
17
73°
49°
18
72°
52°
19
73°
48°
20
75°
50°
21
78°
52°
22
80°
53°
23
82°
56°
24
83°
56°
25
82°
55°
26
80°
54°
27
77°
53°
28
75°
52°
29
74°
51°
30
75°
52°
31
74°
52°
1
75°
51°
2
76°
52°
3
78°
54°
4
81°
56°
5
79°
53°
6
77°
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 66° to 85°, with overnight lows between 48° and 56°. The average high for May is 76° with an average low of 53°. 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.
