S
M
T
W
T
F
S
26
64°
52°
27
68°
50°
28
72°
46°
29
73°
48°
30
70°
52°
1
75°
55°
2
73°
56°
3
68°
53°
4
68°
49°
5
68°
46°
6
74°
52°
7
80°
54°
8
82°
55°
9
80°
57°
10
79°
56°
11
79°
57°
12
76°
58°
13
75°
56°
14
76°
56°
15
75°
54°
16
76°
56°
17
78°
57°
18
78°
58°
19
79°
58°
20
79°
57°
21
78°
58°
22
79°
58°
23
80°
59°
24
80°
59°
25
79°
58°
26
79°
58°
27
78°
57°
28
73°
56°
29
72°
55°
30
72°
56°
31
73°
57°
1
75°
58°
2
77°
57°
3
76°
57°
4
75°
56°
5
75°
57°
6
74°
54°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Fallbrook
Fallbrook's May 2026 forecast shows daily high temperatures ranging from 68° to 82°, with overnight lows between 46° and 59°. The average high for May is 76° with an average low of 56°. 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 Fallbrook. See also: June | July | August.
