S
M
T
W
T
F
S
30
85°
56°
31
86°
55°
1
84°
54°
2
87°
56°
3
89°
56°
4
83°
55°
5
83°
56°
6
82°
54°
7
88°
56°
8
88°
56°
9
89°
57°
10
89°
57°
11
88°
56°
12
85°
56°
13
82°
55°
14
81°
54°
15
82°
55°
16
85°
56°
17
87°
57°
18
88°
56°
19
87°
55°
20
87°
56°
21
86°
56°
22
87°
55°
23
83°
54°
24
82°
54°
25
85°
53°
26
85°
55°
27
84°
55°
28
84°
54°
29
82°
51°
30
84°
54°
1
81°
49°
2
76°
46°
3
77°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Healdsburg
Healdsburg's September 2026 forecast shows daily high temperatures ranging from 76° to 89°, with overnight lows between 46° and 57°. The average high for September is 85° 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 Healdsburg. See also: October | November | December.
