S
M
T
W
T
F
S
30
78°
58°
31
79°
58°
1
78°
60°
2
79°
61°
3
80°
59°
4
81°
59°
5
79°
60°
6
78°
60°
7
92°
73°
8
93°
72°
9
92°
73°
10
94°
74°
11
94°
75°
12
94°
74°
13
95°
77°
14
91°
76°
15
90°
75°
16
88°
74°
17
89°
75°
18
89°
74°
19
87°
75°
20
88°
74°
21
86°
74°
22
86°
73°
23
85°
74°
24
86°
74°
25
86°
73°
26
85°
74°
27
86°
74°
28
87°
72°
29
87°
74°
30
88°
73°
1
88°
72°
2
84°
69°
3
85°
69°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in San Rafael
San Rafael's September 2026 forecast shows daily high temperatures ranging from 84° to 95°, with overnight lows between 69° and 77°. The average high for September is 89° with an average low of 74°. 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 San Rafael. See also: October | November | December.
