S
M
T
W
T
F
S
30
76°
55°
31
76°
49°
1
75°
47°
2
69°
49°
3
70°
48°
4
70°
48°
5
71°
49°
6
68°
49°
7
70°
48°
8
71°
46°
9
68°
47°
10
71°
50°
11
71°
52°
12
68°
50°
13
70°
47°
14
71°
46°
15
68°
50°
16
69°
48°
17
65°
47°
18
64°
48°
19
63°
47°
20
68°
50°
21
68°
49°
22
Hist. Avg.
61°
45°
23
Hist. Avg.
60°
45°
24
Hist. Avg.
60°
44°
25
Hist. Avg.
60°
44°
26
Hist. Avg.
60°
43°
27
Hist. Avg.
59°
43°
28
Hist. Avg.
59°
43°
29
Hist. Avg.
59°
42°
30
Hist. Avg.
59°
42°
1
Hist. Avg.
58°
42°
2
Hist. Avg.
58°
41°
3
Hist. Avg.
58°
41°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Lyons Brook
Lyons Brook's September 2026 forecast shows daily high temperatures ranging from 63° to 76°, with overnight lows between 46° and 55°. The average high for September is 70° with an average low of 49°. 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 Lyons Brook. See also: October | November | December.
