S
M
T
W
T
F
S
26
66°
50°
27
70°
45°
28
75°
45°
29
81°
48°
30
84°
50°
1
84°
50°
2
73°
50°
3
70°
52°
4
63°
50°
5
72°
54°
6
77°
55°
7
82°
50°
8
82°
53°
9
88°
56°
10
88°
56°
11
93°
61°
12
94°
59°
13
90°
59°
14
85°
57°
15
81°
56°
16
81°
57°
17
83°
55°
18
82°
54°
19
82°
52°
20
81°
53°
21
76°
51°
22
76°
51°
23
79°
53°
24
82°
53°
25
82°
54°
26
80°
51°
27
84°
52°
28
81°
52°
29
85°
58°
30
87°
58°
31
88°
57°
1
88°
58°
2
87°
58°
3
84°
57°
4
81°
58°
5
79°
57°
6
80°
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 76° to 94°, with overnight lows between 50° and 61°. The average high for May is 84° with an average low of 55°. 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.
