S
M
T
W
T
F
S
26
62°
49°
27
62°
51°
28
73°
46°
29
75°
51°
30
74°
52°
1
77°
54°
2
80°
55°
3
65°
55°
4
64°
52°
5
66°
51°
6
78°
54°
7
85°
56°
8
88°
57°
9
91°
61°
10
94°
59°
11
94°
60°
12
91°
59°
13
87°
59°
14
92°
60°
15
86°
57°
16
84°
58°
17
81°
55°
18
84°
59°
19
84°
60°
20
85°
59°
21
84°
59°
22
84°
60°
23
85°
60°
24
86°
59°
25
85°
60°
26
85°
60°
27
84°
57°
28
78°
56°
29
77°
55°
30
77°
55°
31
78°
58°
1
78°
59°
2
80°
58°
3
80°
58°
4
81°
57°
5
81°
57°
6
80°
54°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Fontana
Fontana's May 2026 forecast shows daily high temperatures ranging from 64° to 94°, with overnight lows between 51° and 61°. The average high for May is 83° with an average low of 58°. 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. See also: June | July | August.
