S
M
T
W
T
F
S
30
70°
48°
31
69°
47°
1
72°
48°
2
73°
52°
3
73°
52°
4
72°
47°
5
69°
46°
6
68°
48°
7
71°
50°
8
72°
47°
9
72°
51°
10
71°
51°
11
72°
52°
12
72°
48°
13
69°
44°
14
67°
48°
15
66°
49°
16
65°
50°
17
66°
50°
18
70°
50°
19
69°
49°
20
69°
50°
21
70°
46°
22
69°
44°
23
64°
42°
24
63°
43°
25
64°
44°
26
64°
44°
27
65°
45°
28
62°
49°
29
65°
48°
30
65°
47°
1
66°
48°
2
67°
47°
3
62°
40°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Upminster
Upminster's September 2026 forecast shows daily high temperatures ranging from 62° to 73°, with overnight lows between 40° and 52°. The average high for September is 68° with an average low of 48°. 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.
