S
M
T
W
T
F
S
26
64°
52°
27
68°
50°
28
72°
46°
29
73°
48°
30
70°
52°
1
76°
54°
2
76°
55°
3
69°
51°
4
68°
46°
5
68°
50°
6
72°
52°
7
76°
57°
8
75°
57°
9
74°
55°
10
73°
56°
11
75°
57°
12
76°
58°
13
78°
56°
14
75°
53°
15
69°
49°
16
70°
50°
17
70°
50°
18
71°
51°
19
71°
50°
20
72°
51°
21
77°
55°
22
78°
57°
23
79°
56°
24
76°
54°
25
77°
56°
26
79°
57°
27
78°
56°
28
77°
54°
29
76°
53°
30
72°
51°
31
72°
51°
1
73°
52°
2
74°
53°
3
76°
54°
4
78°
56°
5
78°
56°
6
77°
55°
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 79°, with overnight lows between 46° and 58°. The average high for May is 74° with an average low of 54°. 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.
