S
M
T
W
T
F
S
30
79°
56°
31
72°
54°
1
72°
54°
2
71°
61°
3
77°
53°
4
76°
53°
5
72°
58°
6
71°
60°
7
78°
61°
8
79°
60°
9
78°
59°
10
77°
57°
11
71°
59°
12
70°
57°
13
78°
56°
14
76°
57°
15
Hist. Avg.
73°
57°
16
Hist. Avg.
72°
56°
17
Hist. Avg.
72°
56°
18
Hist. Avg.
72°
56°
19
Hist. Avg.
71°
55°
20
Hist. Avg.
71°
55°
21
Hist. Avg.
71°
55°
22
Hist. Avg.
70°
54°
23
Hist. Avg.
70°
54°
24
Hist. Avg.
70°
53°
25
Hist. Avg.
69°
53°
26
Hist. Avg.
69°
53°
27
Hist. Avg.
69°
52°
28
Hist. Avg.
68°
52°
29
Hist. Avg.
68°
52°
30
Hist. Avg.
68°
51°
1
Hist. Avg.
67°
51°
2
Hist. Avg.
67°
51°
3
Hist. Avg.
67°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Southwest Middlesex
Southwest Middlesex's September 2026 forecast shows daily high temperatures ranging from 70° to 79°, with overnight lows between 53° and 61°. The average high for September is 75° with an average low of 57°. 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 Southwest Middlesex. See also: October | November | December.
