S
M
T
W
T
F
S
26
80°
53°
27
80°
49°
28
71°
55°
29
77°
58°
30
68°
48°
1
67°
45°
2
64°
43°
3
67°
34°
4
77°
35°
5
78°
40°
6
66°
60°
7
68°
46°
8
71°
41°
9
75°
45°
10
81°
48°
11
74°
52°
12
74°
47°
13
77°
43°
14
68°
44°
15
78°
35°
16
82°
47°
17
87°
52°
18
87°
56°
19
87°
56°
20
86°
55°
21
81°
66°
22
78°
66°
23
80°
64°
24
80°
65°
25
81°
69°
26
79°
65°
27
83°
63°
28
83°
63°
29
80°
60°
30
78°
59°
31
78°
61°
1
81°
60°
2
78°
59°
3
77°
56°
4
78°
60°
5
79°
60°
6
81°
59°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Fontana Dam
Fontana Dam's May 2026 forecast shows daily high temperatures ranging from 77° to 83°, with overnight lows between 56° and 69°. The average high for May is 80° with an average low of 62°. 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 Fontana Dam. See also: June | July | August.
