S
M
T
W
T
F
S
27
75°
52°
28
77°
48°
29
91°
47°
30
91°
51°
1
89°
46°
2
91°
49°
3
100°
52°
4
91°
57°
5
91°
55°
6
94°
52°
7
92°
48°
8
90°
49°
9
68°
54°
10
71°
55°
11
73°
42°
12
73°
41°
13
79°
40°
14
83°
41°
15
89°
47°
16
93°
45°
17
92°
45°
18
67°
45°
19
65°
53°
20
74°
50°
21
75°
52°
22
68°
46°
23
79°
43°
24
81°
43°
25
78°
46°
26
79°
45°
27
75°
46°
28
73°
47°
29
73°
48°
30
68°
48°
31
74°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
October Weather in Petaluma
Petaluma's October 2026 forecast shows daily high temperatures ranging from 68° to 81°, with overnight lows between 43° and 52°. The average high for October is 75° with an average low of 47°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how October weather will actually feel in Petaluma. See also: November | December | January.
