S
M
T
W
T
F
S
30
85°
71°
31
81°
68°
1
82°
65°
2
78°
63°
3
81°
62°
4
82°
61°
5
85°
69°
6
82°
70°
7
86°
68°
8
86°
69°
9
87°
69°
10
84°
68°
11
81°
65°
12
79°
66°
13
78°
65°
14
78°
64°
15
82°
65°
16
81°
64°
17
84°
67°
18
77°
61°
19
78°
62°
20
79°
64°
21
82°
66°
22
80°
66°
23
81°
65°
24
78°
64°
25
79°
65°
26
82°
66°
27
83°
67°
28
83°
66°
29
82°
65°
30
81°
66°
1
82°
65°
2
81°
65°
3
79°
64°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Tierrasanta
Tierrasanta's September 2026 forecast shows daily high temperatures ranging from 77° to 87°, with overnight lows between 61° and 70°. The average high for September is 81° with an average low of 65°. 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 Tierrasanta. See also: October | November | December.
