S
M
T
W
T
F
S
30
90°
51°
31
85°
54°
1
79°
53°
2
78°
54°
3
79°
52°
4
86°
50°
5
85°
51°
6
91°
55°
7
95°
55°
8
94°
57°
9
92°
55°
10
90°
56°
11
101°
54°
12
91°
55°
13
91°
55°
14
91°
55°
15
89°
54°
16
86°
54°
17
90°
53°
18
89°
52°
19
83°
50°
20
86°
54°
21
86°
53°
22
89°
52°
23
83°
50°
24
81°
46°
25
80°
46°
26
80°
47°
27
79°
46°
28
79°
46°
29
80°
47°
30
79°
49°
1
79°
45°
2
80°
46°
3
84°
51°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Ukiah
Ukiah's September 2026 forecast shows daily high temperatures ranging from 78° to 101°, with overnight lows between 45° and 57°. The average high for September is 86° with an average low of 52°. 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 Ukiah. See also: October | November | December.
