S
M
T
W
T
F
S
30
91°
72°
31
86°
66°
1
86°
64°
2
84°
63°
3
81°
61°
4
84°
61°
5
90°
64°
6
77°
66°
7
88°
72°
8
93°
75°
9
99°
78°
10
97°
72°
11
93°
67°
12
89°
67°
13
88°
64°
14
89°
64°
15
90°
64°
16
88°
66°
17
88°
65°
18
89°
64°
19
88°
64°
20
87°
61°
21
83°
60°
22
82°
60°
23
82°
59°
24
83°
59°
25
83°
60°
26
84°
60°
27
81°
59°
28
84°
61°
29
86°
61°
30
87°
62°
1
87°
61°
2
86°
61°
3
87°
60°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Upland
Upland's September 2026 forecast shows daily high temperatures ranging from 81° to 99°, with overnight lows between 59° and 78°. The average high for September is 87° with an average low of 64°. 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 Upland. See also: October | November | December.
