S
M
T
W
T
F
S
26
69°
37°
27
59°
38°
28
61°
44°
29
69°
38°
30
79°
42°
1
73°
46°
2
67°
49°
3
89°
50°
4
73°
51°
5
67°
51°
6
71°
52°
7
72°
52°
8
69°
46°
9
78°
45°
10
72°
50°
11
80°
48°
12
79°
51°
13
64°
51°
14
63°
49°
15
60°
41°
16
59°
43°
17
64°
37°
18
71°
43°
19
72°
44°
20
70°
49°
21
83°
48°
22
82°
47°
23
75°
48°
24
80°
48°
25
63°
50°
26
64°
49°
27
79°
46°
28
79°
51°
29
60°
43°
30
65°
40°
31
71°
43°
1
82°
52°
2
86°
52°
3
72°
47°
4
71°
46°
5
68°
47°
6
67°
45°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Foster
Foster's May 2026 forecast shows daily high temperatures ranging from 60° to 86°, with overnight lows between 40° and 52°. The average high for May is 71° with an average low of 46°. 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 Foster. See also: June | July | August.
