S
M
T
W
T
F
S
30
72°
66°
31
73°
67°
1
74°
64°
2
70°
60°
3
70°
61°
4
71°
63°
5
70°
63°
6
71°
64°
7
71°
63°
8
70°
62°
9
70°
60°
10
71°
62°
11
70°
64°
12
72°
66°
13
73°
64°
14
74°
63°
15
72°
67°
16
72°
67°
17
70°
68°
18
69°
68°
19
70°
67°
20
70°
66°
21
69°
67°
22
72°
67°
23
72°
66°
24
71°
68°
25
75°
67°
26
75°
67°
27
74°
63°
28
73°
63°
29
70°
64°
30
70°
66°
1
72°
67°
2
75°
66°
3
76°
62°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Mission Bay
Mission Bay's September 2026 forecast shows daily high temperatures ranging from 69° to 76°, with overnight lows between 60° and 68°. The average high for September is 72° 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 Mission Bay. See also: October | November | December.
