S
M
T
W
T
F
S
30
79°
50°
31
69°
52°
1
73°
60°
2
77°
57°
3
70°
57°
4
77°
55°
5
82°
52°
6
81°
53°
7
93°
52°
8
97°
55°
9
104°
63°
10
101°
61°
11
87°
56°
12
77°
54°
13
79°
51°
14
84°
54°
15
79°
55°
16
77°
54°
17
80°
53°
18
81°
55°
19
82°
54°
20
83°
53°
21
82°
56°
22
86°
58°
23
86°
57°
24
85°
58°
25
81°
52°
26
83°
56°
27
76°
52°
28
76°
50°
29
77°
52°
30
78°
51°
1
82°
54°
2
76°
53°
3
77°
51°
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 76° to 86°, with overnight lows between 50° and 58°. The average high for September is 80° with an average low of 54°. 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.
