S
M
T
W
T
F
S
30
73°
63°
31
72°
59°
1
72°
57°
2
70°
63°
3
79°
66°
4
70°
59°
5
73°
55°
6
81°
59°
7
77°
64°
8
N/A
9
69°
54°
10
70°
60°
11
73°
53°
12
75°
62°
13
74°
57°
14
74°
61°
15
74°
54°
16
68°
52°
17
68°
55°
18
70°
53°
19
69°
54°
20
70°
53°
21
69°
51°
22
69°
50°
23
68°
50°
24
69°
49°
25
68°
46°
26
65°
46°
27
65°
47°
28
66°
48°
29
65°
48°
30
66°
47°
1
65°
42°
2
65°
48°
3
66°
49°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Upminster
Upminster's September 2026 forecast shows daily high temperatures ranging from 65° to 75°, with overnight lows between 42° and 62°. The average high for September is 69° 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 Upminster. See also: October | November | December.
