S
M
T
W
T
F
S
30
78°
64°
31
78°
64°
1
77°
65°
2
77°
62°
3
76°
64°
4
75°
65°
5
76°
67°
6
80°
67°
7
79°
68°
8
78°
67°
9
77°
66°
10
77°
65°
11
78°
67°
12
77°
67°
13
78°
66°
14
72°
59°
15
78°
67°
16
78°
66°
17
77°
66°
18
75°
62°
19
72°
61°
20
73°
61°
21
74°
63°
22
76°
64°
23
76°
62°
24
73°
60°
25
70°
57°
26
70°
57°
27
69°
56°
28
69°
57°
29
70°
58°
30
71°
59°
1
70°
58°
2
72°
62°
3
77°
63°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Tijuana River Valley
Tijuana River Valley's September 2026 forecast shows daily high temperatures ranging from 69° to 80°, with overnight lows between 56° and 68°. The average high for September is 75° with an average low of 63°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how September weather will actually feel in Tijuana River Valley. See also: October | November | December.
