S
M
T
W
T
F
S
30
87°
53°
31
87°
55°
1
86°
54°
2
86°
55°
3
87°
56°
4
86°
56°
5
87°
54°
6
86°
52°
7
93°
50°
8
91°
48°
9
89°
48°
10
88°
47°
11
87°
48°
12
88°
49°
13
87°
48°
14
88°
54°
15
87°
54°
16
88°
53°
17
91°
54°
18
91°
54°
19
90°
53°
20
91°
53°
21
91°
52°
22
89°
52°
23
86°
51°
24
86°
51°
25
84°
52°
26
89°
52°
27
89°
51°
28
87°
51°
29
88°
52°
30
87°
51°
1
88°
52°
2
90°
51°
3
88°
53°
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 84° to 93°, with overnight lows between 47° and 56°. The average high for September is 88° 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.
